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Re: [Question #653502]: Impose boundary conditions to FlowEngine when using a predicate as surface

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From: Bruno Chareyre <question653502@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 26 Jul 2017 13:08:57 -0000
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Question #653502 on Yade changed:
https://answers.launchpad.net/yade/+question/653502

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Hello,
I have plans to make the meshing of arbitrary contours possible but for the moment it is not the case.
The only thing you could do as it is now is to immerse the spherical domain in a cubic fluid domain (by really introducing 6 bounding bodies or by using the engine's min/max method for defining bounding planes). If there is no macroscopic pressure gradient it is nearly equivalent to applying the external fluid pressure directly at the surface of the sphere. If there is an external pressure gradient however this will generate some fluxes around the granular domain.
If this is the case you could go find by yourself which fluid cells are incident to the surface of the sphere and impose pressure there. I'm afraid it would be a painful exercise though.
Cheers
Bruno

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