Re: [Yade-users] [Question #253562]: PFV compressibility in undrained triaxial test
Question #253562 on Yade changed: https://answers.launchpad.net/yade/+question/253562 Yade Guide posted a new comment: Hey jakob-ifgt, check out some related threads. This is an automated reply. Title: "PFV compressibility, not truly compressible?" Question by rcaulk on 02 Jun 2017: The user appreciates Yade's PFV implementation for solving poroelastic problems and acknowledges the developers. They question whether the method fully accounts for fluid compressibility due to assumptions made in Poiseuille's law and parallel plate approximation. The user suggests considering the coefficient of linearity as a function of absolute pressure to account for changes in viscosity and conductivity with pressure. Bruno agrees that this model is acceptable for most geomechanical fluids, but acknowledges that it would need a more sophisticated solver for non-constant viscosity problems. The user suggests discretizing the pore throat and linearizing the pressure gradient at each point along the discretization as an option to incorporate compressibility into the pore throat without going full 3D Navier-Stokes. Ah, I think I understand now. You are saying that the only approximation is the constant viscosity. I was just saying the change of viscosity of geofluids as a function of pressure is small enough in the liquid phase at a constant temperature that it is OK to neglect it. This is why I say we are assuming constant temperature with our constant viscosity assumption. But this is likely what you were getting at when you mentioned that this model is inappropriate for gases earlier. I also now realize that the change of fluid density at low mach numbers is negligible too, so it seems the scheme is actually accurately considering all possible compressibility given the aforementioned assumptions. I guess it would be futile to try and gain accuracy by considering these small changes to viscosity within the pore throats without considering full convective and conductive heat transfer in the system.summary https://answers.launchpad.net/yade/+question/640093 Title: "Derived strain field in triaxial compression test" Question by maquankun on 17 Oct 2018: The user is experiencing difficulties with their script and seeks assistance from others. They are attempting to generate a strain field by using TW.setState(1) and tracking changes in the strain field over time under compression. The user has since resolved their issue, thanking Robert Caulk for his help. https://answers.launchpad.net/yade/+question/675267 Title: "Triaxial compression test displacement field" Question by maquankun on 29 Aug 2018: Jan was having an issue with their program where it only generated a vtk file at the beginning and didn't continue generating files during the simulation. The user suggested using PyRunner in O.engines to call an export function, such as doExport(), or running the simulation 'in cycle' for better output. This solution resolved the problem. https://answers.launchpad.net/yade/+question/673124 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707758]: JCFmat model parameters issue
Question #707758 on Yade changed: https://answers.launchpad.net/yade/+question/707758 Status: Needs information => Open Mahdi gave more information on the question: Hi Robert, Many thanks for your reply! I believe I've resolved the issue. The problem was with the value of "intRadius." I'm not entirely sure what it represents, but I increased it to 1.5, and now the model is functioning correctly. Previously, when it was set to 1.3, the model was only controlled by tensile strength. However, increasing the cohesion had no observable effect. Do you know what is "intRadius"? Thanks -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707635]: Strange servo using ServoPIDController
Question #707635 on Yade changed: https://answers.launchpad.net/yade/+question/707635 Yade Guide posted a new comment: Hey kyle2000, check out some related threads. This is an automated reply. Title: "A problem with using the ServoPIDController() function" Question by wangkaichao on 08 Apr 2023: The user is encountering difficulties with using the ServoPIDController() function in Yade on Ubuntu 22.04. They are seeking assistance in setting the target value to a sine function of time within their code. The user has provided information about the function's usage and suggested solutions, including using labels and PyRunner for more advanced options. https://answers.launchpad.net/yade/+question/706118 Title: "Servo control of flexible membrane using ServoPIDController" Question by kyle2000 on 13 Jul 2023: The user is seeking help with using a ServoPIDController for servo control of a flexible membrane with confining pressure. They have been advised to assign corresponding center-oriented forces to the grid nodes and start with a simpler approach by prescribing force directly to the nodes using O.forces.setPermF. If insisting on servo control, the user can use ServoPIDController for each grid node, calculating the confining stress area and targeting a specific force value. The user asked if the 'axis' in PIDController should be defined individually for each node, to which the response was yes, with a few considerations. They are also looking into the correctness of the function for calculating the stress on the loading plate and confining stress. The difficulty lies in determining proper proportional parameters for kP, kI, and kD. A user suggested reading the wikipedia article and testing the parameters on a simple example. Another user confirmed that the function for calculating the stress on the loading plate and confining stress looks correct. https://answers.launchpad.net/yade/+question/707278 Title: "About servo process of triaxialStressController engine" Question by littlefish on 14 Mar 2019: The user is having difficulty controlling servo processes in a triaxialStressController engine for a triaxial test with wall boundaries. They experience large fluctuations in confining pressure when axial strain exceeds 20-30%. The user wonders if there's a way to control the confining pressure within a smaller range during the test.In response to this issue, Bruno suggests that large fluctuations can have various causes and recommends providing more information for a more accurate answer. He mentions that when the tolerance is zero, servo-control will do its best unless the difference is exactly zero. https://answers.launchpad.net/yade/+question/679193 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707641]: How to make a propeller spin?
Question #707641 on Yade changed: https://answers.launchpad.net/yade/+question/707641 Yade Guide posted a new comment: Hey qfxx-123, check out some related threads. This is an automated reply. Title: "about rotate" Question by jpeng22 on 01 Nov 2016: The user is encountering an issue with a Yade ODE simulation where a rigid body is rotating on the rotation axis (0,1,0) and translating along the z-axis, but only rotates in a fixed situation. The user has tried setting the zeroPoint for the RotationEngine to O.bodies[0].state.pos without success. Thanks to Jan Stránský's help, the problem was solved. https://answers.launchpad.net/yade/+question/403708 Title: "How to rotate the box" Question by qfxx-123 on 19 Apr 2022: The user is seeking guidance on rotating a box in their code using a specific command. They want the box to be rotated 45 degrees around a line that passes through its centroid and is parallel to the z-axis. The suggested solution involves creating the box with the `utils.box()` function, appending it to the list of objects, and then setting its orientation using the `state.ori` attribute with the axis and angle values. https://answers.launchpad.net/yade/+question/701413 Title: "Rotate cylinder" Question by mithushan93 on 25 Mar 2021: Jim sought advice on simulating gravity in YADE, with Joe recommending using g=-9.8. To ensure accuracy and efficiency, it's often beneficial to adjust velocities or angular velocities rather than directly updating position or orientation, as per best practices in YADE. Jan Stránský's suggestion resolved Jim's query. https://answers.launchpad.net/yade/+question/696243 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707685]: MPY, box-sphere interactions isn't real
Question #707685 on Yade changed: https://answers.launchpad.net/yade/+question/707685 Yade Guide posted a new comment: Hey ginmaru, check out some related threads. This is an automated reply. Title: "some interactions (sphere-box(width=Period width) are not detected " Question by portal3 on 09 Apr 2022: The discussion revolves around a problem where particles cross the box when its size is similar or larger than the periodic cell's size. Jan suggests splitting large walls into smaller walls as one possible solution or manually copying the wall to surrounding cells. Xin found success with manual copies of the solid boundary in their MWE, but still faces issues with larger sized walls and cylinders. Xin tried again with more particles using copying the boundary manually and had some success. Jan is confused about the difference between extending large bodies and copying them manually in the surrounding cells' position. https://answers.launchpad.net/yade/+question/701266 Title: "Interactions between a boxes isn't 'real'" Question by ginmaru on 13 Jul 2023: The user is encountering issues with interactions between boxes in their code due to the lack of a 'Ig2_Box_Box' functor, causing one box to fall through another instead of behaving as spheres would. They are seeking assistance to implement this functor to resolve the problem. https://answers.launchpad.net/yade/+question/707285 Title: "Box interacton with gravity" Question by balbuquer on 03 Aug 2016: The user is having trouble achieving a desired stress in an oedometric test where the upper plane is a body interacting with spheres inside a box. They have calculated the density of the box using a formula based on the goal stress, OedometerCrossSection, and BoxVolume but are still unable to achieve the desired stress despite changing the box density. The user has eliminated the hypothesis that box objects are not affected by gravity. https://answers.launchpad.net/yade/+question/320069 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707758]: JCFmat model parameters issue
Question #707758 on Yade changed: https://answers.launchpad.net/yade/+question/707758 Yade Guide posted a new comment: Hey mahdi2023, check out some related threads. This is an automated reply. Title: "A problem with 'JCFmpMat'" Question by qfxx-123 on 19 Jun 2023: The user is seeking clarification on the differences between 'JCFpmMat' and 'FrictMat' when their tensile strength and cohesion are set to zero. Despite having similar structures, the results of the two triaxial tests were significantly different. The user wants to know why the sample is stress-free at the first iteration of a JCFPM simulation, the use of 'intR>1' in the engine when particles are touching each other, and how to edit the code if they want the results of 'JCFpmMat' to be same with 'FrictMat'. The user has set 'intR' to 0 and tried again, finding that the strength of the two methods is identical. They thanked the person for their guidance. https://answers.launchpad.net/yade/+question/707022 Title: "JCFpmMat parameters define" Question by voyagening on 29 Nov 2020: The JCFpm parameters in YADE are used for simulating jointed materials like fractured rocks. These include 'cohesion' and 'jointCohesion', which account for different mechanical properties of the matrix and fractures, respectively. Additional parameters such as 'jointDilation' and 'jointSurface' allow for defining the dilation of jointed contacts following the physics of rock joints. Aaron expressed gratitude for a helpful explanation and plans to further research these concepts. https://answers.launchpad.net/yade/+question/694253 Title: "How to set the parameters of JCFpmMat?" Question by qfxx-123 on 11 Jul 2023: The user is seeking clarification on how to set parameters in JCFpmMat, specifically tensileStrength and cohesion in relation to degree of interlocking. Luc provides guidance by suggesting defining the C/T ratio of BPM equal to compressive strength / tensile strength of the rock being modeled. https://answers.launchpad.net/yade/+question/707257 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707430]: Contact model for differentiating between static and dynamic friction
Question #707430 on Yade changed: https://answers.launchpad.net/yade/+question/707430 Status: Answered => Solved Paul Schröder confirmed that the question is solved: Thanks Karol Brzezinski, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707430]: Contact model for differentiating between static and dynamic friction
Question #707430 on Yade changed:
https://answers.launchpad.net/yade/+question/707430
Status: Solved => Open
Paul Schröder is still having a problem:
Thanks for your feedback, Karol and thanks for the sample code,
that helped me a lot and also answered my question so far. I just have a small
question about this, which is rather less related to the friction value itself:
Why does the rotational speed of the particle sp1 not decrease despite the
counteracting friction force. How can friction dissipation be activated in the
Mindlin-material-model?
In addition, for future readers, I would like to extend the above
example in the code shown below to include the friction values from the
different material pairings distinguished in my other question.
With best wishes, Paul
from yade import plot
## PARAMS
mu_static00 = 0.8
mu_static01 = 0.4
mu_static11 = 0.1
mu_dynamic00 = 0.5
mu_dynamic01 = 0.3
mu_dynamic11 = 0.1
# FUNCTIONS
def check_interactions():
for i in O.interactions:
b1, b2 = O.bodies[i.id1],O.bodies[i.id2]
if i.phys.isSliding:
if b1.mat.id == idMat0 and b2.mat.id == idMat0:
i.phys.tangensOfFrictionAngle = mu_dynamic00
elif (b1.mat.id == idMat0 and b2.mat.id == idMat1) or (b1.mat.id ==
idMat1 and b2.mat.id == idMat0):
i.phys.tangensOfFrictionAngle = mu_dynamic01
elif b1.mat.id == idMat1 and b2.mat.id == idMat1:
i.phys.tangensOfFrictionAngle = mu_dynamic11
else:
print("Kombination Gleitreibpartner nicht vorgesehen")
else:
if b1.mat.id == idMat0 and b2.mat.id == idMat0:
i.phys.tangensOfFrictionAngle = mu_static00
elif (b1.mat.id == idMat0 and b2.mat.id == idMat1) or (b1.mat.id ==
idMat1 and b2.mat.id == idMat0):
i.phys.tangensOfFrictionAngle = mu_static01
elif b1.mat.id == idMat1 and b2.mat.id == idMat1:
i.phys.tangensOfFrictionAngle = mu_static11
else:
print("Kombination Haftreibpartner nicht vorgesehen")
## MATERIALS
idMat0 = O.materials.append(FrictMat(frictionAngle = atan(mu_static00),
label='Mat0'))
idMat1 = O.materials.append(FrictMat(frictionAngle = atan(mu_static11),
label='Mat1'))
## BODIES
sp1 = O.bodies.append(sphere((0,0,0),0.1, fixed = True, material =
O.materials['Mat0']))
sp2 = O.bodies.append(sphere((0,0.199,0),0.1, fixed = True, material =
O.materials['Mat1']))
# rotate one sphere
O.bodies[sp1].state.angVel = (2.5e-3,0,0)
## ENGINES
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_MindlinPhys()],
[Law2_ScGeom_MindlinPhys_Mindlin()],
),
NewtonIntegrator(),
PyRunner(command = "plot.addData(t = O.time, F =
O.interactions[0,1].phys.shearForce.norm(), v1 = O.bodies[sp1].state.angVel[0],
v2 = O.bodies[sp2].state.angVel[0])", virtPeriod = 1),
PyRunner(command = "check_interactions()", iterPeriod = 100),#
]
O.dt = PWaveTimeStep()*0.5
plot.plots = {'t':(('F','b-'),None,('v1','g--'),('v2','r--'))}
plot.plot(subPlots = False)
O.run()
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Re: [Yade-users] [Question #707197]: Undrained triaxial (NOT CONSTANT VOLUME)
Question #707197 on Yade changed: https://answers.launchpad.net/yade/+question/707197 Fedor posted a new comment: Hello Bruno, still need your help regarding this stuff Grand-cheers -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707758]: JCFmat model parameters issue
Question #707758 on Yade changed: https://answers.launchpad.net/yade/+question/707758 Status: Open => Needs information Robert Caulk requested more information: Hey, It is not immediately clear what the question is. When you assign tensile strength, the tensile strength plays a role. When you set the tensile strength to 0, it does not play a role. So far everything makes sense. Can you elaborate? Cheers, Robert -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707758]: JCFmat model parameters issue
Question #707758 on Yade changed: https://answers.launchpad.net/yade/+question/707758 Yade Guide posted a new comment: Title: "How to set the normal stiffness in the simulation?" Question by suncan on 30 Oct 2021: The user is having trouble with a simulation and needs help setting normal stiffness. They provided code attempting to append a new material (WallMat) with jointNormalStiffness=2.5e6 and jointShearStiffness=1e6, but the simulation isn't working as expected. Karol suggests consulting the FrictMat documentation and using young and poisson properties like in the case of spheres. https://answers.launchpad.net/yade/+question/699278 Title: "Boundary properties" Question by johnav on 13 Nov 2019: The user is seeking guidance on properties for plates created with facetbox in YADE to perform strength tests on 'rock' samples. They want to know the appropriate properties to assign and whether the plates should be made rigid like in a real test apparatus. The continuation provides information about setting up the simulation with YADE, suggesting that bodies created with facetBox() have zero mass and inertia by default. https://answers.launchpad.net/yade/+question/685848 Title: "damping in ViscElMat" Question by feda.s on 28 Nov 2016: Jérôme Duriez's solution resolved Jim's question about simulating gravity. In response to suggestions and comments, it was noted that using global damping instead of viscous damping may be a better approach for reaching the target porosity in the specific case. https://answers.launchpad.net/yade/+question/404455 Title: "Evolving material properties and timestep instability" Question by rborela on 19 Aug 2015: The user is experiencing numerical instability in a dense pack simulation with a porosity of 11%. Despite gentle stiffening and shrinking, the time step is decreasing rapidly, resulting in 'nan' values or particle explosion. The user seeks suggestions to handle this issue. Thanks Jan Stránský, that solved my question. Thank you very much, Jan. I changed that and ran the simulation from beginning to end and it worked perfectly :) https://answers.launchpad.net/yade/+question/270524 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #707689]: Apply viscous forces on gridnodes
Question #707689 on Yade changed: https://answers.launchpad.net/yade/+question/707689 Nesrin Akel posted a new comment: Hello, Thank you, Jérome! And I appreciate that you caught my question in a short time, despite the Launchpad problems! Nesrin -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #165210]: Saving, loading cylinders
Question #165210 on Yade changed:
https://answers.launchpad.net/yade/+question/165210
Yade Guide posted a new comment:
Hey there! As an automated bot, I've gone through your question and
found a few related threads that might interest you. Feel free to
explore these topics further by clicking on the links below.
Title: "after loading simulation "
User encounters issues with 'simul.py' due to type mismatch while attempting to
add oscillations and modify iterations for a falling cylinder simulation. Jan
recommends using O.run(11200, True) instead of O.save('init_config.yade.gz')
and suggests checking if the second script includes a Cylinder object and if
saving the packing would suffice. The user also inquired about appending
harmonic motion.
https://answers.launchpad.net/yade/+question/678583
Title: "Problems with manipulation force container after erasing some bodies"
The user encounters a segmentation core fault due to force container
manipulation after erasing bodies from the simulation, suspecting that manually
resetting forces after stepping might be causing the issue in various versions
of Yade and Yadedaily. Jan confirms it's not a silly bug but a regular one.
https://answers.launchpad.net/yade/+question/699375
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Re: [Yade-users] [Question #164510]: TranslationEngine + RotationEngine
Question #164510 on Yade changed: https://answers.launchpad.net/yade/+question/164510 Yade Guide posted a new comment: Hey there! As an automated bot, I've gone ahead and found relevant threads that might interest you. Feel free to explore further by clicking on the links provided. Title: "setting initial velocity" Bruno suggests starting with impacting a single facet on a single sphere, Jim faced an error during clumping due to needing to set mass and inertia of facets before clumping them. Jan provided guidance on how to properly append the clumped facets to the bodies list. https://answers.launchpad.net/yade/+question/673023 Title: "Simulation blocked after O.run in a conditional translation motion" User encountered issues with their Python simulation involving TranslationEngine. They sought help for a motion translation problem caused by a frozen boundary at the O.run(1,True) statement. The user tried using O.wait() without success and found it strange that O.run();O.wait() didn't execute O.run(1,True). Jan Stránský suggested removing PyRunner(command='kinematics_WS()',...) from O.engines and calling kinematics_WS() at the end of the script, which solved the problem. https://answers.launchpad.net/yade/+question/688203 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #164547]: Angular velocity from orientation
Question #164547 on Yade changed: https://answers.launchpad.net/yade/+question/164547 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned through some relevant threads and compiled a summary for you. Feel free to explore further by clicking on the links provided. Title: "Rotational Resistance" Ataollah is trying to apply a simplified rotational resistance approach in their Python model. They are using RotationEngine but need help assigning the particle's rotational velocity from the last iteration. Jerome suggests defining 'blockedDOFs' for each corresponding particle, including a PyRunner engine in the engine list, and using a trickRotation() function to update the velocity. https://answers.launchpad.net/yade/+question/648215 Title: "how to set the orientation quaternion parameter so as to fully rotate a 3-d object " The user is seeking guidance on how to set the orientation quaternion parameter for a 3-D object in YADE to fully rotate it, specifically for research purposes involving investigating the rebound response of an irregular particle against different contact points. The user has been provided with an example using a box and a rotation by pi/3 around the z axis. https://answers.launchpad.net/yade/+question/679422 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #164422]: capillary bridge rupture
Question #164422 on Yade changed: https://answers.launchpad.net/yade/+question/164422 Yade Guide posted a new comment: Hi there! As an automated bot, I've gone through some relevant threads and compiled a summary for you. Feel free to explore more by clicking on the links attached. Title: "Implémentation of capillary force during mechanical contact" Vincent seeks an easy solution for extending ViscElCapMat to simulate capillary forces between two spherical particles, proposing adding '=' after '<' in the source code line. Jérôme Duriez's suggestion resolved his question. Bruno agrees with the theoretical perspective that no empirical force model is needed, and suggests improvements to the existing algorithm. https://answers.launchpad.net/yade/+question/689741 Title: "modelling "solid bridges" between particles" The user seeks guidance on modeling solid bridges between particles as beams in Yade using cohesion force for tension and shear stresses, with specific parameters for a cylindrical beam joining two spherical particles. The user also inquires about connecting multiple particles via beams and finds Bruno's provided links helpful. https://answers.launchpad.net/yade/+question/683775 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #164545]: Enclosing the particles
Question #164545 on Yade changed: https://answers.launchpad.net/yade/+question/164545 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned through some relevant threads and compiled a summary for you. Feel free to dive deeper into each topic by clicking on the links provided. Title: "Force on a moving boundary imported from a stl file" V wants to control the compression of a packing in a box by a moving boundary imported from an STL file, seeking to measure the force on this boundary. They need clarification on how to obtain this information. https://answers.launchpad.net/yade/+question/688178 Title: "Porosity control (fixed volume and particle size)" Adel is seeking help with simulating dry granular flow using spherical particles in a box, focusing on setting porosity without changing volume or particle size. Christian suggests using yades porosity or voxelPorosity functions in a PyRunner for calculating porosity. For complex geometries like free surfaces, TesselationWrapper can be used to compute porosity per particle and then averaged in inner regions. The continuation confirms that voxelPorosity gives the same results as tesselation-based porosity, but particles near the free surface should be filtered out based on position. https://answers.launchpad.net/yade/+question/237037 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #164881]: qt.View() segmentation fault
Question #164881 on Yade changed: https://answers.launchpad.net/yade/+question/164881 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned through a few relevant threads and condensed their content for your convenience. Don't forget to click on the links if you want more details! Title: "Save the simulation result without OpenGL GLX" Milly faced issues with her Ubuntu server while running simulations using pack_cloud.py. Jan recommended updating OS and YADE for better support. Milly inquired about saving sphere positions without a graphics window and the impact of 'rRelFuzz' on particle distribution when using 'psdSizes' and 'psdCumm'. Jan explained that 'rRelFuzz' is not considered if 'psdSizes' is specified, and 'psdSizes' makes the mode RDIST_PSD. Milly thanked Jan for his assistance. https://answers.launchpad.net/yade/+question/694102 Title: "Error while compilation" The problem has been resolved, but no specific solution is mentioned. https://answers.launchpad.net/yade/+question/629694 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #164131]: Bodies with state fixed
Question #164131 on Yade changed: https://answers.launchpad.net/yade/+question/164131 Yade Guide posted a new comment: Hi there! As a helpful automated bot, I've scanned through relevant threads and condensed their content for your convenience. Feel free to delve deeper into these topics by clicking on the provided links. Title: "Creating particles" A user is having trouble creating particles in a bouncing spheres example with Yade 0.60 due to a SyntaxError when trying to create a second sphere. Jan suggests correcting the syntax by removing the braces and adding a comma. https://answers.launchpad.net/yade/+question/164389 Title: "Problem with angular velocity" Jonathan faced issues with initializing angular velocity for non-spherical shapes in Yade on Ubuntu 14.04 LTS server, Jan suggested using angMom instead of angVel and asked about versions used. Jonathan resolved the issue with Jan's suggestion. https://answers.launchpad.net/yade/+question/401682 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #160858]: Geometrical intersection between 2 objects
Question #160858 on Yade changed: https://answers.launchpad.net/yade/+question/160858 Yade Guide posted a new comment: Hey! As an automated bot, I've scanned through some relevant threads and summarized them below. Feel free to delve deeper into these topics by clicking on the links attached. Title: "Can not see existed particles in "show 3D" " Jan provided advice on calculating AABB dimensions for a cylinder shape. Despite using AABB parameters, Jim faced issues with particles exploding during simulation. Jan suggested checking particle visibility before starting the simulation. Leonard thanked Jan and found two solutions: increasing wall's stiffness or reducing O.dt. https://answers.launchpad.net/yade/+question/683821 Title: "sumForces" Riccardo is using Yade to simulate a hollow cylinder moving into an aggregate of particles, recording forces with utils.sumForces. He asks if facets not in contact with particles contribute to the forces. https://answers.launchpad.net/yade/+question/224276 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #163165]: O.save(), O.load() with an erased body ?
Question #163165 on Yade changed: https://answers.launchpad.net/yade/+question/163165 Yade Guide posted a new comment: Hello! As a helpful bot, I've found relevant threads that might interest you. Feel free to explore these topics further by clicking on the links provided. Title: "erase particles(segmentation fault)" A user encounters a segmentation fault in Yade simulation after deleting particles. Jan advises reporting a bug due to potential issues with TriaxialStressController handling of deleted bodies. Jerome suggests using newer versions as the issue might have been resolved. The user acknowledges Bruno's point about documenting problems through bug reports but doesn't guarantee immediate solutions. The user thanks Jérôme Duriez for solving the problem and asks for guidance on two issues: why len(O.bodies) remains unchanged after erasing particles, and how to apply wall positions without causing compaction. https://answers.launchpad.net/yade/+question/668274 Title: "Running several simulations in a loop" A user is experiencing an error when running simulations in a loop using Yade due to a mutex lock issue, and needs assistance with their script and how to insert it into the loop. https://answers.launchpad.net/yade/+question/670332 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #163929]: Example gts-horse.py
Question #163929 on Yade changed: https://answers.launchpad.net/yade/+question/163929 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned through some relevant threads and compiled a summary for your convenience. Don't forget to click on the links if you want more details! Title: "Cannot open the file 'gts.coarse.gts'" User encountered issues opening 'gts.coarse.gts' file for script 'gts-horse.py', received RuntimeError due to missing z coordinate. Changing Yade version to yade-daily didn't resolve the problem, but another 'gts.coarse.gts' file in '/usr/share/doc/yade/example/gts-horse' worked after comparing with 'meld' and finding a line break difference when opened in Notepad. https://answers.launchpad.net/yade/+question/212029 Title: "gts surface import problem" A user is having trouble importing a gts file (cylinder.gts) into Yade due to an issue with the z coordinate in the file. They have been advised to check the file's first line for the number of vertexes, edges, and faces, and suggested to use stl2gts to convert a stl file into gts format. Users express frustration with using STL files directly in Yade and wish for a more direct method. https://answers.launchpad.net/yade/+question/246833 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #163776]: triaxial shear test and internal friction angle
Question #163776 on Yade changed:
https://answers.launchpad.net/yade/+question/163776
Yade Guide posted a new comment:
Hey there! As an automated bot, I've scanned through some relevant
threads and condensed their content for your convenience. Feel free to
delve deeper into these topics by clicking on the links provided.
Title: "plot diagram in PeriTriaxController "
The user is searching for ways to reset plot.data in the compactionFinished
function, which can be achieved by setting plot.data = {} or
commenting/deleting plot.plot() before deviatoric part. Alireza appreciates
Jan's assistance and finds it helpful.
https://answers.launchpad.net/yade/+question/679661
Title: "Units of Parameters"
The user inquired about units for parameters like radiusMean, box dimensions,
stresses (sigmaIso and sigmalateral) when simulating a graphical interface.
They asked about applying a pressure of 100kPa in a triaxial shear test and if
sigmaIso is 100,000 when the linear dimensions are in meters. The user
mentioned that the correct unit for pressure should be kg/m^3.
https://answers.launchpad.net/yade/+question/170564
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Re: [Yade-users] [Question #163824]: 3D View (shift-click)
Question #163824 on Yade changed: https://answers.launchpad.net/yade/+question/163824 Yade Guide posted a new comment: Hey there! As an automated bot, I've gathered some relevant threads and condensed their content for your convenience. Feel free to explore further by clicking on the links below. Title: "How to make certain particles "invisibles" to others?" Luc wants to make certain particles invisible in a simulation without deleting them, so they can compute displacement and strain fields correctly. Klaus suggests using mask or groupMask for this purpose. Jerome recommends adding the avoidSelfInteractionMask functionality from the yade.wrapper.InsertionSortCollider class. https://answers.launchpad.net/yade/+question/403534 Title: "can not see particles in "show 3D"" Leonard experiences visibility issues with spheres in Yade simulations, particularly in scenarios 1-3. He shares scripts for reproducing the problem and proposes solutions like reloading the 3D view. Robert Caulk's solution resolved Leonard's question. https://answers.launchpad.net/yade/+question/683489 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #156756]: Inclusion of attractive Van der Waals type particle-particle forces?
Question #156756 on Yade changed: https://answers.launchpad.net/yade/+question/156756 Yade Guide posted a new comment: Hello there! As a helpful automated bot, I've scanned through some relevant threads and condensed their content for your convenience. Feel free to delve deeper into each topic by clicking on the links attached. Title: "[Yade]How to output forces(Fx,Fy,Fz) acting on moving facet" The user is seeking assistance with implementing forces and moments on moving facets and sphere particles in Yade using various parameters, thanking Jan for previous help and asking if they can seek further assistance later. https://answers.launchpad.net/yade/+question/252413 Title: "Coupling YADE with CFD" Shailesh is seeking guidance on coupling YADE with CFD for DEM-CFD simulation of a 20,000 sphere random packing in a cube at an initial temperature of 500K. He wants to study the distance travelled by cold fluid (300K) with varying flow rate. Feng Chen provided information on YADE-OpenFOAM and ESyS-Foam, suggesting that Shailesh should adapt an OpenFOAM thermal analysis solver into it. https://answers.launchpad.net/yade/+question/256106 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #160514]: launching yade
Question #160514 on Yade changed: https://answers.launchpad.net/yade/+question/160514 Yade Guide posted a new comment: Hey there! As an automated bot, I've gone through your question and found a few relevant threads that might interest you. Feel free to explore these topics further by clicking on the links provided below. Title: "compilation failed on debian wheezy" The user faced issues with YADE, which were resolved by deleting 'build-unknown'. Despite using the latest git version (7b3752a), they still encountered 'yade-unknown' on Wheezy. The issue should be fixed when python-git 0.3.2~RC1-1 migrates to Wheezy, and the user needs to clean their scons.profile from any 'garbage'. https://answers.launchpad.net/yade/+question/193815 Title: "Problem while launching YADE" Benoit encounters issues with YADE launch due to missing libraries despite successful compilation, Jerome and Anton provide assistance. Suggestions include using '/home/benoit/YADE/install' as the DINSTALL_PREFIX and checking if 'DINSTALL_PREFIX=$HOME/YADE/install' works. Starting from rev 6d9fdab6 it does not matter any more, what path to use: relative or absolute. https://answers.launchpad.net/yade/+question/204120 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #159123]: how to link an external library with YADE
Question #159123 on Yade changed: https://answers.launchpad.net/yade/+question/159123 Yade Guide posted a new comment: Hey there! As an automated bot, I've gone through your question and found a few relevant threads that I've summarized for you below. Feel free to explore further by clicking on the links. Title: "Creation of a new engine" A user is having trouble with an engine they're trying to create, despite successful compilation. They need help identifying the specific issue. Anton asked if the engine should be added to an existing file or a new one. https://answers.launchpad.net/yade/+question/153255 Title: "Cylindrical triaxial test using Pfacet" Kyle is seeking help with simulating cylindrical triaxial tests in Yade, particularly for servo control and understanding 'triax.py' code. He wants a minimal working example for this simulation and desires to achieve quasi-equilibrium compression by defining a velocity value. Kyle is puzzled about the meaning of 'the triangle facets will break' when running 'triax' py without any changes, especially regarding whether it means particles do not touch each other. He has created flexible membranes using Pfacet and is unsure about how to proceed after this. https://answers.launchpad.net/yade/+question/707148 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #159705]: Is it a bug ? mass won't update after desity changing
Question #159705 on Yade changed: https://answers.launchpad.net/yade/+question/159705 Yade Guide posted a new comment: Hi there! As an automated bot, I've gone through your question and found a few relevant threads that might interest you. Feel free to explore these topics further by checking out the links provided below. Title: "problem replacing TriaxialStressController with PeriTriaxController" Jesse discusses using PeriTriaxController for simulating gravity with cloud of clumps or periodic packing, addressing issues with makeclumpcloud and changing the periodic controller. Jan suggests increasing maxStrainRate to speed up compression, which worked after setting it to 1e10 and running 500,000 steps. Bruno offers further suggestions like decreasing 'compressor.mass' and checking if O.dt=PWaveTimeStep() is accurate for clumps. https://answers.launchpad.net/yade/+question/656214 Title: "Changing properties of spheres causing problems." The user encounters slow deposition and compression when modifying sphere properties (density, Young's modulus, Poisson's ratio, friction angle) in a gravity deposition followed by uniaxial compression example. The issue occurs when using non-default material properties, causing the compression to start at 80,000 iterations or more. Jan Stránský suggested checking the time step (O.dt), which depends on material stiffness. https://answers.launchpad.net/yade/+question/248023 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #158171]: pack hexanet
Question #158171 on Yade changed: https://answers.launchpad.net/yade/+question/158171 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned through some relevant threads and condensed their content for your convenience. Feel free to delve deeper into these topics by clicking on the links attached. Title: "Can YADE generate specific number of polyhedral particles in a packing?" The user requested guidance on using YADE for simulating gravity deposition with polyhedral particles of specific sizes, Jan confirmed the possibility by replacing spherical makeClouds with polyhedral particles. Jan provided a simple implementation involving creating a sphere pack, making a cloud from it, and then creating a polyhedron at each position. https://answers.launchpad.net/yade/+question/706257 Title: "Visualise forcechain in paraview" Leonard encounters issues visualizing a force chain in ParaView with tube sizes scaled by force magnitude despite Karol's suggestions. Karol recommends selecting 'forceN' from the drop-down list in the 'tube' filter settings for desired results, as Paraview usually performs this automatically. Leonard updates to v5.10.1 but still faces the same problem, unsure if it's due to his ParaView settings or the example.vtk file. Karol suggests saving and uploading the Paraview state file to help diagnose the issue. https://answers.launchpad.net/yade/+question/706533 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #159902]: Reinforced Concrete Beam
Question #159902 on Yade changed: https://answers.launchpad.net/yade/+question/159902 Yade Guide posted a new comment: Hi there! As a helpful automated bot, I've scanned through relevant threads and condensed their content here. Feel free to delve deeper into these topics by clicking on the links provided. Title: "How to choose an appropriate material property" Huihuang Xia is seeking advice on selecting suitable material properties for modeling an impact crater using YADE, specifically for rock particles and steel components. https://answers.launchpad.net/yade/+question/464190 Title: "Boundary properties" The user seeks guidance on boundary properties, material properties, frictional interaction, and rigidity for a plate created with facetbox in YADE for 'rock' samples. They are advised to use JCFpmMat.type for material properties and two different materials for frictional interaction. FacetBox() functions should be correctly defined and assign correct mass and inertia without any action from the user. The user's question was solved by Jérôme Duriez. https://answers.launchpad.net/yade/+question/685848 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #156721]: Compiation problem
Question #156721 on Yade changed: https://answers.launchpad.net/yade/+question/156721 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned some relevant threads and condensed their content for your convenience. Feel free to delve deeper into these topics by clicking on the links attached. Title: "Gts error while installing yade in ubuntu 14.04" A user inquired about using Yade version 1.07.0 for compilation, with Jan seeking clarification on the specific version. Jerome advised against using an old version and recommended trying a more recent one. The user later reported that Yade runs fine after installing version 16.04. https://answers.launchpad.net/yade/+question/444311 Title: "A question about the function" Users discussed issues with accessing the 'state' attribute from a tuple object while calculating particles' distance dropped from a plank. They suggested changing the code to 'O.bodies(i).state.pos[2]'. Alternative solutions included looping over all bodies or using ids list returned by the 'toSimulation' function. Another issue arose with 'cz' being a float, causing problems with the 'max(cz)' function. https://answers.launchpad.net/yade/+question/634452 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #155725]: Plot data
Question #155725 on Yade changed: https://answers.launchpad.net/yade/+question/155725 Yade Guide posted a new comment: Hey there! As an automated bot, I've scanned through relevant threads and compiled a summary for your reference. Feel free to explore further by clicking on the links attached. Title: "interaction histogram" The user is having trouble plotting a polar interaction histogram using 'interaction-histogram.py'. They have defined a function called 'Intrhisto()' which plots the histogram at certain intervals, but nothing is being plotted in the output file. The user has also successfully used 'utils.plotDirections()' before and wants help with this issue. The function plotDirections() uses other functions, interactionAnglesHistogram() and bodyNumInteractionsHistogram(), which are defined here: https://github.com/yade/trunk/blob/master/py/_utils.cpp. https://answers.launchpad.net/yade/+question/247136 Title: "imposible to reach specific porosity" The user encounters difficulty in achieving a specific porosity level during a periodical triaxial test tutorial, causing the simulation to halt when the condition is not met. The user suspects an issue with the 'O.run' command and expresses gratitude upon finding a solution. https://answers.launchpad.net/yade/+question/703055 -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
