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[Feng Chen <question165417@xxxxxxxxxxxxxxxxxxxxx>]

Question #165417 on Yade changed:
https://answers.launchpad.net/yade/+question/165417

Feng Chen proposed the following answer:
Hi, Bruno:

That reference is from PFC2D's (v3.1) manual "Fixed coarse-grid fluid
scheme in PFC2D", I remember it is in the second example of fluidized
bed.

I have not done in-depth research about this, but my experience is your
dn/dt and d(rho*n)/dt (n is the porosity, rho is fluid density) must be
small (but don't know how small it should be) compared to other terms,
or your solution for N-S equation will soon fail, if omit your porosity
derivative in your N-S equation, everything will be happy...

feng

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