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How to separate the porous region?

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Old   March 4, 2013, 04:01
Default How to separate the porous region?
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hesam
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hi

would you please explain me how do you separate the porous region in opoenFoam?


thanks


Quote:
Originally Posted by Se9a View Post
Hello!
I try to use a porousSimpleFoam solver to simulate a flow in a 2D channel from two equal parts, a free flow part and a porous part (wall's type set in the 'slip' for simplicity):



Base case is a angleDictImplicit.

My results are a good p, but strange oscillating U.
On the next sctrutured mesh:


I get this solution:


Velocity field is:



One can see what velocity is good but slightly oscillated on porous boundary. So, question is:

Are such oscillations caused by a stepwise porous source? If yes, how can I specify smooth porous source?



But more bad situation have place on non-structured mesh.
Mesh is


Solution is:




One can see very oscillating velocity in the porous region.
So, why this happens? Non-orthogonal correction not helped.

Thanks.
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Old   March 4, 2013, 18:58
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Bruno Santos
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Greetings Hesam and welcome to the forum!

I've moved your post to a new thread, because the other thread was already a bit old.

As for your question, please study the following two tutorials:
  • OpenFOAM's tutorial "incompressible/porousSimpleFoam/angledDuctImplicit". It uses the cell zone definitions directly in "blockMeshDict".
  • This one is an adaptation of the previous tutorial, but using snappyHexMesh: Multiple regions with a porous zone
Best regards,
Bruno
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