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-   -   foam-extend: different empty (2-D) directions (https://www.cfd-online.com/Forums/openfoam/220199-foam-extend-different-empty-2-d-directions.html)

Michael@UW August 28, 2019 12:44

foam-extend: different empty (2-D) directions
 
Does anybody have any idea how to deal with the following error?



I encounter the error when running foam-extend 4.1 in parallel "Some processors detect different empty (2-D) directions. Probably using empty patches on a bad parallel decomposition".



My empty direction is along x-axis. I tried different decomposing methods in decomposeParDict file and the domain is successfully decomposed as expected. , but it keeps giving the same error. The error pops up at the first time step most of the time, sometime after some iterations. By the way, I am using sixDoFRigidBodyDisplacement boundary condition (0/pointDisplacement) and the solver is interDyMFoam.



The case runs well in serial mode.



decomposeParDict:

numberOfSubdomains 2;
method simple;
//method scotch; //same error
//method metis; //same error
simpleCoeffs
{
n ( 1 2 1 );
delta 0.001;
}

Hgholami November 4, 2019 06:21

Dear Michael@UW
I have the same problem with cyclic boundary condition and dynamic mesh (fsiFoam). Do you resolve it?

Michael@UW November 4, 2019 12:25

No. I have not solved this issue. But I found the inconsistent empty direction is caused by the dynamic mesh motion; there is an unexpected rotation to make the mesh of the empty patch not on the same plane. I constrain the object but it still produces some motion along the direction which is not supposed to have.

Hgholami November 8, 2019 02:22

As your tip, I separate cyclic boundary condition to multi part and use "preservePatch" in decomposeDict to add each part to a processor. I think it works.

Michael@UW November 24, 2019 21:13

Quote:

Originally Posted by Hgholami (Post 749223)
As your tip, I separate cyclic boundary condition to multi part and use "preservePatch" in decomposeDict to add each part to a processor. I think it works.

That's a good way! I may try that later. Recently I learned there is a tool name flattenMesh which can make the patch flat, but I havenít tried it.


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