Re: [Yade-users] [Question #682859]: how to calculate anisotropy of contact normal vector
Question #682859 on Yade changed: https://answers.launchpad.net/yade/+question/682859 Status: Open => Answered William Chevremont proposed the following answer: Hi, PDFEngine do that for you. It compute the average of quantities like stress, distance, and probability of interaction for each orientation. For now, it works only for spherical particles. Just add PDFEngine(filename="PDF.txt", iterPeriod=1000, numDiscretizeAnglePhi=9,numDiscretizeAngleTheta=13, label="PDFRecorder") in your engines. This will output a PDF.txt containing the density functions, with column name like NormalStress_xy(theta, phi) Formulas: x = r sin theta sin phi y = r cos phi z = r sin theta cos phi This is a work in progress (not well documented for now) but it work as is. -- 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 #682859]: how to calculate anisotropy of contact normal vector
Question #682859 on Yade changed: https://answers.launchpad.net/yade/+question/682859 Jan Stránský proposed the following answer: Hello, as (almost) always, a MWE [1] would be useful (e.g. to know what "particle" is - sphere, polyhedra...), expressing on a few artificially created spheres and artificially created interactions to show what you want to achieve and what is your expectation of "anisotropy of contact normal vector", etc. Often you could solve your problem just by preparing such MWE. Furthermore, it will help us to help you :-) > how to calculate the contact normal vector for i in O.interactions: contactNormalVector = i.geom.normal # [2] > i want to know how to calculate anisotropy of contact normal vector if I understand it correctly, fabric tensor (as suggested by Bruno) is what you are looking for [3] cheers Jan [1] https://www.yade-dem.org/wiki/Howtoask [2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.GenericSpheresContact.normal [3] https://yade-dem.org/doc/yade.utils.html#yade._utils.fabricTensor -- 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 #682857]: how to calculate anisotropy of contact normal vector
Question #682857 on Yade changed: https://answers.launchpad.net/yade/+question/682857 Status: Open => Invalid Jan Stránský rejected the question: duplicate of #682859 -- 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 #682883]: calculate mass content of a group of particles through something like label
New question #682883 on Yade: https://answers.launchpad.net/yade/+question/682883 Hi, I'd like to calculate the mass content of a group of spheres, as far as I know, we can obtain a mass of one sphere by: O.bodies[id].state.mass I'd like to ask that if we can obtain the mass of a group of spheres like: appending some spheres with a same label, like: O.append(sphere((x1,y1,z1),radius=radius,label="label1")) O.append(sphere((x2,y2,z2),radius=radius,label="label1")) O.append(sphere((x3,y3,z3),radius=radius,label="label2")) O.append(sphere((x4,y4,z4),radius=radius,label="label2")) then we can obtain the total mass of spheres with label1, and label2 respectively? I have tried in Yade, it seems that we can not give each sphere a label, is there any way that we can classify the spheres to different groups so that we can just loop in one group of spheres to calculate the mass? Thanks in advance! -- 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 #682883]: calculate mass content of a group of particles through something like label
Question #682883 on Yade changed: https://answers.launchpad.net/yade/+question/682883 Status: Open => Answered gaoxuesong proposed the following answer: Hi, The possible way i think is that using different lists to save the sphere's id of different groups and do loop in each list. ## group 1 ## list1 = [] list1.append(O.append(sphere((x1,y1,z1),radius=radius1))) ... ## group 2 ## list2 = [] list2.append(O.append(sphere((x2,y2,z2),radius=radius2))) ... ## calculate the mass of different groups ## masstotal1 = 0 for each in list1: masstotal1 + = O.bodies[each].state.mass masstotal2 = 0 for each in list2: masstotal2 + = O.bodies[each].state.mass ## ends ## Cheers, Xuesong -- 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 #682898]: Which model is used to calculate the cohesive force?
New question #682898 on Yade: https://answers.launchpad.net/yade/+question/682898 Hi. I have looked through the document for Law2_ScGeom6D_CohFrictPhys_CohesionMoment. It gives the formula to calculate the contact force. Fn=min(kn∗(un−upn),an). an is the cohesive force. But is there any material to refer to get the detailed description about cohesive force, an? Thanks, Xuesong -- 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 #682898]: Which model is used to calculate the cohesive force?
Question #682898 on Yade changed: https://answers.launchpad.net/yade/+question/682898 gaoxuesong posted a new comment: I have checked the definition of CohFrictMat. So the normalCohesion and shearCohesion is the an and as appeared in the documentation of Law2_ScGeom6D_CohFrictPhys_CohesionMoment? -- 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
