[Yade-users] [Question #665529]: about indentation error in example of yade website
New question #665529 on Yade: https://answers.launchpad.net/yade/+question/665529 Hello, I have a question about indentation error in loading example number two (Gravity deposition) of https://yade-dem.org/doc/tutorial-examples.html When I run it, it say that unbalancedForce() is not defined! why does this error appear?how can I fix it? Does yade know how to define unbalancedForce() or I have to define for it? Thank you very much for your help in advance. Best Regards Alireza -- 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 #665514]: Application of flow engines on saturated flows
Question #665514 on Yade changed: https://answers.launchpad.net/yade/+question/665514 Robert Caulk posted a new comment: Hello Nicolas, I can only speak for the standard FlowEngine (and I think TwoPhaseFlow derives from FlowEngine). It is a finite volume scheme, so it requires the application and maintenance of boundary conditions. As of right now, the FlowEngine will automatically apply and maintain these for you in a box configuration. Your described requirements sound like a highly dynamic and arbitrarily shaped system - FlowEngine will likely need heavy modifications to produce the results you are after. In response to your question "can I apply flowengine only inside granular media": yes, FlowEngine triangulates the pores by using the particles as nodes. I have never used HydrodynamicsLBM so I am not sure if it is suitable or not for your simulation. Best, 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 #665387]: Compile error JointedCohesiveFrictionalPM
Question #665387 on Yade changed: https://answers.launchpad.net/yade/+question/665387 Thomas Chauve proposed the following answer: Hello I have similar probleme with the latest mater branch (from 12/03/2018). I compile it on Debian 9 with GCC 6.3.0. I had no trouble before (last version tested is the one dated of 21/02/2018). I see that JointedCohesiveFrictionalPM.cpp JointedCohesiveFrictionalPM.cpp have been modified 6 day ago. I try someting : I compile the new master (from 12/03/2018) with the old JointedCohesiveFrictionalPM.cpp JointedCohesiveFrictionalPM.cpp (from 21/02/2018 branch) and it works. I hope it can helps. Cheers Thomas -- 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 #665440]: how can make a path for yade to load python files
Question #665440 on Yade changed: https://answers.launchpad.net/yade/+question/665440 Status: Answered => Solved Alireza Sadeghi confirmed that the question is solved: Dear Jan, Thank you very much for your help. It was about the folder that my program was in it. it was solved. Thanks a lot. Best Regards Alireza -- 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 #665440]: how can make a path for yade to load python files
Question #665440 on Yade changed: https://answers.launchpad.net/yade/+question/665440 Alireza Sadeghi confirmed that the question is solved: Thanks Jan Stránský, 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 #665350]: The parameter (en, es )of the DMT model
Question #665350 on Yade changed: https://answers.launchpad.net/yade/+question/665350 Status: Answered => Solved zhao dejin confirmed that the question is solved: Thanks Chiara Modenese, 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
[Yade-users] [Question #665514]: Application of flow engines on saturated flows
New question #665514 on Yade: https://answers.launchpad.net/yade/+question/665514 Dear all, I am a new user of YADE. The purpose of my internship is to find a way to model the flow of a saturated material down a chute [1]. I read the documentation about flow engines available in YADE such as FlowEngine() [2] [3] and HydrodynamicsLawLBM() [4]. Moreover, I am still looking for documentation for TwoPhaseFlowEngine() [5]. I conclude that all engines need to be defined in a box and that the engines can’t be used for modelling a flow along a chute. I will explain how I plan to proceed. I would like to realize a release of a saturated volume of a mix of water (density of 1200kg/m³ and higher viscosity than water viscosity) and granular media. This volume will flow along a rectangular channel which extremity is closed by a wall. First step, I do a gravity deposit at the top of my channel. A wall holds this volume. Once it is stabilized (unbalancedForce() < threshold), I remove the wall and let the volume flows along the channel, in a dam-break manner. Regarded as I plan to do, I am not sure if I can apply a flow engine only inside the granular media. Do flow engines necessarily have to be applied on a box ? Maybe I miss understood something. Thanks in advance, Regards, Nicolas [1] https://en.wikipedia.org/wiki/Debris_flow [2] Chareyre, B., Cortis, A., Catalano, E., Barthélemy, E., 2012. Pore-Scale Modeling of Viscous Flow and Induced Forces in Dense Sphere Packings. Transp. Porous Media 92, 473‑493. https://doi.org/10.1007/s11242-011-9915-6 [3] Catalano, E., Chareyre, B., Barthélémy, E., 2014. Pore-scale modeling of fluid-particles interaction and emerging poromechanical effects. Int. J. Numer. Anal. Methods Geomech. 38, 51‑71. https://doi.org/10.1002/nag.2198 [4] Lominé, F., Scholtès, L., Sibille, L., Poullain, P., 2013. Modeling of fluid‑solid interaction in granular media with coupled lattice Boltzmann/discrete element methods: application to piping erosion. Int. J. Numer. Anal. Methods Geomech. 37, 577‑596. https://doi.org/10.1002/nag.1109 [5] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.TwoPhaseFlowEngine -- 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 #665350]: The parameter (en, es )of the DMT model
Question #665350 on Yade changed: https://answers.launchpad.net/yade/+question/665350 Status: Open => Answered Chiara Modenese proposed the following answer: Hi, Glad to know the work has been useful. Surface energy (gamma) is a measurable material parameter, and also an input of the DMT model. You need to find out what the typical value(s) is for your material based on the relevant literature (sorry but I can't help you directly with this). For the damping coefficients, en and es, these are there to replicate dissipation forces, which you will need to calibrate in your model against experimental values, depending on the purpose of your DEM simulations. I hope this is of help, Chiara -- 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 #665350]: The parameter (en, es )of the DMT model
Question #665350 on Yade changed: https://answers.launchpad.net/yade/+question/665350 Status: Open => Answered Chiara Modenese proposed the following answer: Hi, If you are looking to use the DMT model for adhesive particles, this is a simple extension of the Hertz Mindlin formulation. The Hertzian contact relationship is shifted down by the adhesive force. You can check this on the literature, or at page 39, 40 of my PhD thesis [*]. The adhesive force should already be implemented in the current version of the HertzMindlin.cpp contact law and it is a function of gamma. Apologies if this has not been documented properly but it should work fine if you are familiar with Yade. If you need further assistance, let me know and I can provide you with a sample script. HTH, Chiara [*] http://www.eng.ox.ac.uk/civil/publications/theses/modenese_pdf -- 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 #665350]: The parameter (en, es )of the DMT model
Question #665350 on Yade changed: https://answers.launchpad.net/yade/+question/665350 Status: Answered => Open zhao dejin is still having a problem: Hi, Thanks ,Chiara, I have read your PhD thesis yet ,It's really a wonderful work and thanks to your work ,I am familiar with the DMT model . Three parameter are need in the DMT model of YADE, such as gamma ,en ,es. But I failed to find the effective valus of the 316L stainless steel which is the material I have studied .So I turn to someone did the research of this material for help.Thanks again. Best wishes ZDJ -- 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 #665350]: The parameter (en, es )of the DMT model
Question #665350 on Yade changed: https://answers.launchpad.net/yade/+question/665350 Summary changed to: The parameter (en, es )of the DMT model Description changed to: Hi , yade users : recently, I'm doing the DEM simulation of the stainless steel, the DMT model must be considered. However , I fail to find the effective parameters of the material, such as gamma, en, es. If someone did the research of this material or somebody can provide me some paper about it . Thanks in advance. Best wishes ZDJ -- 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 #665440]: how can make a path for yade to load python files
Question #665440 on Yade changed: https://answers.launchpad.net/yade/+question/665440 Status: Open => Answered Jan Stránský proposed the following answer: Hi Alireza, > I am new user of YADE welcome :-) the error says, that Python does not know about Hello.py file. There are a few possible reasons 1) the actual file could be named differently, hello.py (linux is case sensitive) 2) in the terminal, you are in different location than you saved Hello.py file. So e.g. if you save your hallo.py in e.g. Documents/yade, you should write in terminal cd Documents/yade and then yade Hello.py let us know if it helped cheers Jan -- 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
[Yade-users] [Question #665507]: The connection between grid nodes disappear
New question #665507 on Yade:
https://answers.launchpad.net/yade/+question/665507
Hello,
I am trying to write a script to place a geogrid in soil packing. My script is
based on the example :
trunk/examples/grids/Simple_Grid_Falling.py
The problem is in the combination of the script modelling soil packing and the
script for geogrid. After combining them, the connections between the gridNodes
disappear.
Anyone can help me to find the bugs in this script?
This is my script:
from yade import pack,geom,qt
from yade.gridpfacet import *
rad,gap=.25,.005
#Parameters, which will be passed into spheres and facets creators
kw={'material':0}
kwBoxes={'color':[1,0,0],'wire':False,'dynamic':True,'material':0}
kwMeshes={'color':[1,0,0],'wire':True,'dynamic':False,'material':0}
O.materials.append(FrictMat(young=10e9,poisson=.25,frictionAngle=0.5,density=1e3,label='sphere'))
O.materials.append(CohFrictMat(young=3e2,poisson=0.3,density=1e1,frictionAngle=10,normalCohesion=1e7,shearCohesion=1e7,momentRotationLaw=True,label='spheremat'))
O.engines=[
ForceResetter(),
InsertionSortCollider([
Bo1_GridConnection_Aabb(),Bo1_Sphere_Aabb(),Bo1_Facet_Aabb(),
]),
InteractionLoop(
[Ig2_GridNode_GridNode_GridNodeGeom6D(),Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom(),Ig2_GridNode_Sphere_GridNodeGeom6D(),Ig2_GridNode_Facet_GridNodeGeom6D(),],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False),Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),Law2_ScGeom_FrictPhys_CundallStrack()]
),
NewtonIntegrator(gravity=(0,0,-1000),damping=0.3,label='newton')
]
### Parameters of a rectangular grid ###
L=11 #length [m]
l=11#width [m]
nbL=11 #number of nodes for the length [#]
nbl=11 #number of nodes for the width [#]
r=L/100.#radius
color=[255./255.,102./255.,0./255.]
nodesIds=[]
#Create all nodes first :
for i in range(0,nbL):
for j in range(0,nbl):
nodesIds.append(
O.bodies.append(gridNode([i*L/nbL-20,j*l/nbl,-2.7],r,wire=False,fixed=True,material='spheremat',color=color))
)
#Create connection between the nodes
for i in range(0,len(nodesIds)):
for j in range(i+1,len(nodesIds)):
dist=(O.bodies[i].state.pos - O.bodies[j].state.pos).norm()
if(dist<=L/nbL*1.01):
O.bodies.append( gridConnection(i,j,r,color=color) )
#Create packing
O.bodies.append(pack.regularHexa(pack.inParallelepiped((-10,0,-2.75),(-20,0,-2.75),(-10,10,-2.75),(-10,0,-7.75)),radius=rad,gap=rad/3.0,color=(0.5,0.5,0.1),material='sphere'))
O.bodies.append(pack.regularHexa(pack.inParallelepiped((-10,0,-2.5),(-20,0,-2.5),(-10,10,-2.5),(-10,0,2.25)),radius=rad,gap=rad/3.0,color=(0.5,0.5,0.1),material='sphere'))
O.bodies.append(geom.facetBox((-15,5,-5),(5,5,2.5),wallMask=15,**kwMeshes))
O.bodies.append(geom.facetBox((-15,5,0),(5,5,2.5),wallMask=15,**kwMeshes))
O.bodies.append(geom.facetBox((-15,5,-5),(5,5,2.5),wallMask=16,**kwBoxes))
O.bodies.append(geom.facetBox((-15,5,2.5),(5,5,0),wallMask=16,**kwBoxes))
#Set a fixed node
O.bodies[0].dynamic=False
O.dt=1e-05
O.saveTmp()
O.timingEnabled=True
O.run(1,True)
from yade import timing
timing.stats()
qt.View()
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