Re: [Yade-users] [Question #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Status: Open => Expired Launchpad Janitor expired the question: This question was expired because it remained in the 'Open' state without activity for the last 15 days. -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Status: Answered => Open bin deng is still having a problem: Dear Bruno, Thanks for your advice, that is helpful for me. And I‘m sorry to reply so late. I have been trying to simulate the dynamic response of the soil under wave action by using DEM-PFV modle. Although there are some scripts written, but there are always inappropriate mistakes. You is one of the creators of yade's PFV, I have seen you many papers. Could you please share a related script? Let me learn how to write more correctly. Thanks again. Best, Deng -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Bruno Chareyre posted a new comment: Just a note: if you set the permeabilityFactor negative then the value is used as a Darcy conductivity (probably not a perfect equality but very similar order of magnitude). It implies that in this case conductivity becomes independent of particle sizes and of fluid viscosity. It can help if you want to use particle size just as a discretization parameter. B -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Bruno Chareyre proposed the following answer: >The pressure curves should have a phase difference. This really depends on many parameters (compressibility of the fluid, permeability of the porous medium, stiffness and stability of the solid,... ). Not possible to judge with the info you give. B -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Status: Open => Answered Robert Caulk proposed the following answer: Hello, >I just take into account the actual particle size is very small, so the calculation is very large. Did you try to >simulate experiment with the actual particle size? In some cases you can use DEM as a discretization of space. In other cases, you can let the DE represent the actual particles. Of course, if your particles are very small you won't be able to simulate a large volume without incurring great computational costs as you mention. PFV doesn't discriminate between the two cases, it simply creates a pore network based on the packing you give it. >There is another problem in my simulation. I find that the variations of pore pressure with time at different >depths are the same phase, It is also not reasonable. The pressure curves should have a phase difference. Have you calibrated the packing permeability? 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Status: Solved => Open bin deng is still having a problem: Dear Robert, Thanks for your reply. I just take into account the actual particle size is very small, so the calculation is very large. Did you try to simulate experiment with the actual particle size? There is another problem in my simulation. I find that the variations of pore pressure with time at different depths are the same phase, It is also not reasonable. The pressure curves should have a phase difference. Look forward to your kind reply. Thanks for your advice again. Best, Deng -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Robert Caulk posted a new comment: Hello, Maybe Bruno should answer this since he is one of the creators of yade's PFV, but I might as well share my understanding of how it works. PFV simulates a network of pores with connecting channels. The triangulation of the pore network is controlled by the locations of the discrete elements. Permeability between pores is computed using the "actual" particle sizes and locations, and poromechanical behavior of the packing is simulated using the "actual" particle sizes and locations. Maybe that answers your question? The PFV implementation in yade is well documented in [1] and [2] for further reading. Cheers, Robert [1]Catalano, E., Chareyre, B., & Barthélemy, E. (2014). Pore‐scale modeling of fluid‐particles interaction and emerging poromechanical effects. International Journal for Numerical and Analytical Methods in Geomechanics, 38(1), 51-71. [2]Chareyre, B., Cortis, A., Catalano, E., & Barthélemy, E. (2012). Pore-scale modeling of viscous flow and induced forces in dense sphere packings. Transport in porous media, 94(2), 595-615. -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Status: Open => Solved bin deng confirmed that the question is solved: Dear Robert and Bruno, Thanks for your answers, that solved my question. Can I ask another question? Whether the particles in PFV model simulate the actual particles or just representative particles(not match the actual particle size)? This question is confusing me. Thanks again. Best, Deng -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Bruno Chareyre posted a new comment: Hi, I don't understand the problem described. The fact that the simulation does not match experiments says nothing, you need to compare with a theoretical solution. Bruno -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 Robert Caulk posted a new comment: If I were you I would calibrate the specimen permeability using a positive permeabilityFactor. If you use flow.debug=True you can see some flow statistics that might come in handy, but you might also consider setting up a flow-through test to measure permeability directly. -- 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 #626580]: a problem about PFV
Question #626580 on Yade changed: https://answers.launchpad.net/yade/+question/626580 bin deng gave more information on the question: Hello Robert, Thanks for your answer very much. I have tried to add permeability of the experimental specimen by using permeabilityFactor. But when I add "flow. permeabilityFactor=-0.00012"(the permeability of the experimental specimen is 1.2*10-4cm/s), the simulation results are not improved obviously. So I think there are still other reasons in my code. I also consider if the viscosity of fluid is a reason, and try add it to code some times, but don't resolve the problem. Look forward to your kind reply. Thanks for your advice again! Best, Deng -- 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
