Re: [Yade-users] [Question #665514]: Application of flow engines on saturated flows
Question #665514 on Yade changed:
https://answers.launchpad.net/yade/+question/665514
Bruno Chareyre posted a new comment:
Hi, complimentary answer (for the record)
>So you could conceivably define dynamic boundary conditions by deleting
the old walls, creating new walls, and reassigning the FlowEngine
wallIds.
It would still not enable arbitrary number of walls with arbitrary orientations
("complex" box).
There are 6 walls max in the current implementation and and they have to be
xyz-aligned.
Bruno
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Re: [Yade-users] [Question #665514]: Application of flow engines on saturated flows
Question #665514 on Yade changed: https://answers.launchpad.net/yade/+question/665514 Status: Answered => Solved Nicolas Godet confirmed that the question is solved: Hello, Thank you for your answer. It is very helpful. I will now consider all the options available. Regards, Nicolas -- 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 Status: Open => Answered Robert Caulk proposed the following answer: >> We could define each X iterations an 3D volume/box based on the shape of the flowing material and set the boundary conditions. The main question is: Does FlowEngine accept complex boxes ? Also, I think it is very very expensive in term of CPU computation... >> What do you mean by "complex"? You can redefine the walls used for FlowEngine using wallIds [1]. So you could conceivably define dynamic boundary conditions by deleting the old walls, creating new walls, and reassigning the FlowEngine wallIds. You should be able to accomplish that with a function in your python script. However, I would expect a scheme like that to be very finnicky - you will need to take very small steps to carefully consider stability. [1]https://yade- dem.org/doc/yade.wrapper.html#yade.wrapper.FlowEngine.wallIds -- 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 Status: Answered => Open Nicolas Godet is still having a problem: Hello, About PFV, I thought about two ideas: 1) We could define each X iterations an 3D volume/box based on the shape of the flowing material and set the boundary conditions. The main question is: Does FlowEngine accept complex boxes ? Also, I think it is very very expensive in term of CPU computation... 2) The other idea is to define an indicator (0 or 1) based on the volume of the interstitial pore. With this indicator, I could define the air phase and the fluid phase. The problem may be the discontinuity at the interface. Concerning the periodic box, I am not sure if I can use that. Indeed, how can I compute the front of the flowing material ? The idea is also to study the impact on an obstacle. HydroForceEngine also uses periodic boundary conditions. Is it the only way to use this engine or is it possible to realize a release as I planned to do ? Regards, Nicolas -- 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 Status: Open => Answered Bruno Chareyre proposed the following answer: Hi Nicolas, 1/ PFV You are right overall on the need to bound with boxes in current PFV implementation. It does not mean that the box has to be entirely filled. What it enables directly is the simulation of a submerged avalanche. For an avalanche exposed to air there could be ways to impose appropriate pressure boundary conditions to the elements filling the empty part of the box, this is more involved. Alternatively, if you go for periodic boundary conditions you can have a x-y aligned chute with inclined gravity, which makes the free surface condition easier to impose. 2/ LBM: I don't think it is a realistic option 3/ TwoPhaseFlow: irrelevant 4/ A possible option you did not mention is HydroForceEngine [a], it is probably more realistic than 2/ and 3/ I hope it helps. Bruno [a] http://arxiv.org/pdf/1605.06085.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 #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
[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
