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Re: [Question #701670]: Wrong permeability values during compaction

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From: Bruno Chareyre <question701670@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 09 May 2022 09:41:03 -0000
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Question #701670 on Yade changed:
https://answers.launchpad.net/yade/+question/701670

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
If I understand well, you are compressing a packing with an imposed velocity  of 0.3.
As a result, the fluid goes out through the boundaries where pressure is imposed (top and bottom). 
You then take one of these outward flux and you deduce permeability from it. But in fact the flux in your case is controlled by the imposed velocity (0.3). That's not how permeability can be determined.

For correct evaluation see the example script you started from and alternate steps B and C.
You need to make sure no deformation is going on when you evaluate permeability. A sure way is to fix DOFs and set all velocities to zero. 

Bruno

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