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[Ali Abdallah <question699272@xxxxxxxxxxxxxxxxxxxxx>]

Question #699272 on Yade changed:
https://answers.launchpad.net/yade/+question/699272

Ali Abdallah posted a new comment:
Thank you very much for your clarification and sorry for my late reply.

In the end, I decided to work on the Pore-scale finite volumes method (PFV), as it seems very simple to model.
I did a small model and it worked fine. However, I have some small questions about the parameters if you can help I really appreciate that:

for the two parameters: flow.defTolerance=0.3 and flow.meshUpdateInterval=200, I took their values from the oedometer example. I understand that they are responsible for the threshold and the maximum number of timesteps for retriangulation of the mesh. 
My question is: Can I directly use these two values or I should do a calibration to choose the optimum values knowing that my filter is fixed and only the fine particles are moving.

For the flow.useSolver I saw that the value should be 3 for Cholesky factorization (via Eigen3 interface) and 4 for multicore CPU. In my case, I usually use parallel computation ( -j X ( x can be between 1 and 16 depending on the number of particles). 
My question is: Is multicore CPU has the same meaning as parallel computation? if yes this means I should put the value equal to 4 right? 

Finally is there any criteria to define the timestep? I used to increase
the density of the fine particles as a tool to increase the time step
when I used to do dry filtration tests under gravity. Do you think it is
okay to do the same thing here?

Thank you very much Robert for helping me.

Best regards,
Ali

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