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March 16, 2023, 05:29 |
shifted periodic boundary conditions
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#1 |
Senior Member
Michael Alletto
Join Date: Jun 2018
Location: Bremen
Posts: 616
Rep Power: 16 |
Hello all,
does somebody know how to apply shifted periodic boundary conditions in OpenFOAM. Basically in periodic boundary conditions the velocity at the outflow is taken and reintroduced at the same lateral and vertical position at the inlet. I wanted to do the same, but i want to shift the lateral position by some distance being y the lateral coordinate. x is the streamwise coordinate and z is the wall normal coordinate. The scope is to avoid an annatural long living of the streamwise streaks caused by the periodic boundary conditions. Basically I wanted to do the same as https://www.researchgate.net/publica...urbulent_flows Is there a way to achieve this? Best Michael |
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March 17, 2023, 09:31 |
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#2 |
Senior Member
Michael Alletto
Join Date: Jun 2018
Location: Bremen
Posts: 616
Rep Power: 16 |
Maybe I can aswer the question by myself:
Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 5 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 1; vertices ( ( -2500 -1000 0)// 0 ( 2500 -1000 0) // 1 ( 2500 0 0) // 2 ( -2500 0 0) // 3 ( -2500 -1000 4000) // 4 ( 2500 -1000 4000) // 5 ( 2500 0 4000) // 6 ( -2500 0 4000) // 7 ( -2500 1000 0) // 8 ( 2500 1000 0) // 9 ( -2500 1000 4000) // 10 ( 2500 1000 4000) // 11 ); blocks ( hex (0 1 2 3 4 5 6 7) (250 50 200) simpleGrading (1 1 1) hex (3 2 9 8 7 6 11 10) (250 50 200) simpleGrading (1 1 1) ); edges ( ); boundary ( east1 { type cyclic; neighbourPatch west2; transform translational; separationVector (-5000 1000 0); faces ( (2 6 5 1) ); } east2 { type cyclic; neighbourPatch west1; transform translational; separationVector (-5000 -1000 0); faces ( (2 9 11 6) ); } north { type cyclic; neighbourPatch south; faces ( (1 5 4 0) ); } south { type cyclic; neighbourPatch north; faces ( (8 9 11 10) ); } west1 { type cyclic; neighbourPatch east2; transform translational; separationVector (5000 1000 0); faces ( (0 4 7 3) ); } west2 { type cyclic; neighbourPatch east1; transform translational; separationVector (5000 -1000 0); faces ( (3 8 10 7) ); } lower { type wall; faces ( (0 3 2 1) (3 2 9 8) ); } upper { type patch; faces ( (4 5 6 7) (7 6 11 10) ); } ); mergePatchPairs ( ); // ************************************************************************* // |
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October 15, 2024, 06:48 |
shifted periodic boundary condition progress
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#3 |
New Member
Join Date: Jan 2024
Posts: 3
Rep Power: 2 |
Hi, did you get any further with this. For example working out how to do it for an arbitrary number of outlet/inlet slices? or an openfoam BC that works to similar effect?
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