[Yade-users] [Question #700306]: Calculation of cohesive force between the clump particle
New question #700306 on Yade: https://answers.launchpad.net/yade/+question/700306 Hi, I have some questions about the calculation method of cohesive force between the clump particles. In this simulation model, the particle motion was described using the Hertz‐Mindlin with the DMT model to simulate the Hall flowmeter test. In the simulation result, I found that the spherical powder was changed to a clump model, the cohesive force could be decreased based on the attached powder quantity on the funnel surface. The cohesive force by DMT model can be expressed by: F(DMT) = 4*pi*a*γ, a: equivalent radius, γ: surface energy In my speculation, the equivalent radius between the contact particle seems to be calculated by contacted particles between the clump particles. I'd like to search some detailed equations for the cohesive force between clump particles, but I cannot find it. I'd like to receive some advice about this. Best regards, Yim -- 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 #700186]: Maximum strain rate in a triaxial test
Question #700186 on Yade changed: https://answers.launchpad.net/yade/+question/700186 Status: Open => Answered Fabio proposed the following answer: Hi Alice, In the example case the test is triaxial with constant confinement stress. So the strainRate you apply vertically has a final strain goal while the strain rate in the x and y direction only has the function of keeping the stress constant. Under "normal" conditions, a granular material has a ratio between the axial and transverse strain that is not constant with the deformation (it depends on the stress ratio, the degree of densification, the angle of friction, the packing ...). You can find some information here for regular packings [1]. Moreover, it can instantly have very different values, especially if few particles are used in the sample. A ratio of 10 between z-strainrate and strain rate x and y I guess is simply a precautionary value to ensure that the sample remains stable under these conditions. You can also track the unbalanced forces for this purpose. About the strainrate value you can check in the source code here [2]. Yade controls it in two ways: with a method based on the stiffness of the sample [3] and one based “inertial walls" having a certain mass (and therefore inertia) during their movement [4]. Depending on the dyncell true or false option, you can use the [2] or [3] method. Also pay attention to the value of mass as written here [5]. Cheers Fabio [1] Rowe PW. The stress–dilatancy relation for static equilibrium of an assembly of particles in contact. Proceedings of Royal Society of London A 1962; 269:500–527 [2] https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/PeriIsoCompressor.cpp#L174 [3] https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/PeriIsoCompressor.cpp#L214 [4] https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/PeriIsoCompressor.cpp#L219 [5] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.PeriTriaxController.mass -- 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 #700258]: How to involve adhesionForce in Hertz-Mindlin contact model
Question #700258 on Yade changed: https://answers.launchpad.net/yade/+question/700258 Leonard 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 #700258]: How to involve adhesionForce in Hertz-Mindlin contact model
Question #700258 on Yade changed: https://answers.launchpad.net/yade/+question/700258 Status: Open => Solved Leonard confirmed that the question is solved: Hi Karol, Thanks for your feedback, I will start a new thread to ask this. Best, Leonard -- 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 #700297]: How to get particle displacement in VTK？
Question #700297 on Yade changed: https://answers.launchpad.net/yade/+question/700297 Status: Answered => Solved Xue 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 #700297]: How to get particle displacement in VTK？
Question #700297 on Yade changed: https://answers.launchpad.net/yade/+question/700297 Status: Open => Answered Jan Stránský proposed the following answer: Hello, please provide a MWE [1]. state.displ() is computed simply as state.pos - state.refPos From the description it seems, that the refPos is (0,0,0) for all particles. Try ### for b in O.bodies: b.state.refPos = b.state.pos ### just before the simulation starts. Cheers Jan [1] https://www.yade-dem.org/wiki/Howtoask -- 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 #700297]: How to get particle displacement in VTK？
New question #700297 on Yade: https://answers.launchpad.net/yade/+question/700297 Hello everyone! I want to get the displacement of the particles with exportPolyhedra, so I use the following code： vtk.exportPolyhedra(ids='all',what=dict(Displacement='b.state.displ()')). But I found that what I get is actually the position of the particles, so how should I get the particle displacement? P.S.I checked the related post [1], and tried the following statement: O.bodies[1].state.displ().norm(). But I got a scalar and could not view the displacement components in each of the three directions (x, y, z). xue [1]https://answers.launchpad.net/yade/+question/658514 -- 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 #700290]: What packaging is used for sand pebbles?
Question #700290 on Yade changed: https://answers.launchpad.net/yade/+question/700290 Status: Open => Needs information Jan Stránský requested more information: Hello, please read [1] and provide (much) more information (more detailed description, links, ...) What is "packaging"? [2]? or did you mean packing [3]? What is "sand pebbles"? What is "sand"? What is "pebbles"? . If I put "sand pebbles" to google, first maany pages I get a 1966 movie. With one exception, beeing "Sand Pebbles is a psychedelic rock band from Melbourne".. Cheers Jan [1] https://www.yade-dem.org/wiki/Howtoask [2] https://yade-dem.org/doc/installation.html#packages [3] https://yade-dem.org/doc/user.html#packing-algorithms -- 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 #700271]: Rotational Kinetic Energy
Question #700271 on Yade changed: https://answers.launchpad.net/yade/+question/700271 Status: Answered => Solved Zekeriya Metehan Karslioglu 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 #700258]: How to involve adhesionForce in Hertz-Mindlin contact model
Question #700258 on Yade changed: https://answers.launchpad.net/yade/+question/700258 Karol Brzezinski posted a new comment: Hi Leonard, Sorry, but I don't know how to do it. Maybe you should ask it in a separate topic, so the title matches the question. It will increase your chance that the right person will find your problem. Cheers, Karol -- 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
