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Cyclic boundary conditions concerning channel with constant flow rate |
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November 16, 2012, 12:42 |
Cyclic boundary conditions concerning channel with constant flow rate
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#1 |
New Member
Join Date: Oct 2012
Posts: 16
Rep Power: 14 |
Hi there,
I'm trying to simulate a ribbed 2D channel in fully developed flow, by applying cyclic boundary conditions in streamwise direction and using simpleFoam. The case shall be run at a given bulk Reynolds number so that the flow rate must be specified. My blockMeshDict file looks as follows: Code:
boundary ( inlet { type cyclic; neighbourPatch outlet; faces ( (0 21 22 1) (1 22 23 2) (2 23 24 3) (3 24 25 4) ); } outlet { type cyclic; neighbourPatch inlet; faces ( (16 17 38 37) (17 18 39 38) (18 19 40 39) (19 20 41 40) ); } wall1 { type wall; faces ( (21 0 8 29) ); } wall2 { type wall; faces ( (26 27 6 5) (27 28 7 6) (28 29 8 7) ); } wall3 { type wall; faces ( (26 5 13 34) ); } wall4 { type wall; faces ( (13 14 35 34) (14 15 36 35) (15 16 37 36) ); } wall5 { type wall; faces ( (4 25 33 12) (12 33 41 20) ); } frontAndBack { type empty; faces ( (0 1 9 8) (1 2 10 9) (2 3 11 10) (3 4 12 11) (5 6 14 13) (6 7 15 14) (7 8 16 15) (8 9 17 16) (9 10 18 17) (10 11 19 18) (11 12 20 19) (21 29 30 22) (22 30 31 23) (23 31 32 24) (24 32 33 25) (26 34 35 27) (27 35 36 28) (28 36 37 29) (29 37 38 30) (30 38 39 31) (31 39 40 32) (32 40 41 33) ); } ); Code:
FoamFile { version 2.0; format ascii; class volScalarField; object p; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 2 -2 0 0 0 0]; internalField uniform 0; boundaryField { inlet { type cyclic; } outlet { type cyclic; } wall1 { type zeroGradient; } wall2 { type zeroGradient; } wall3 { type zeroGradient; } wall4 { type zeroGradient; } wall5 { type zeroGradient; } frontAndBack { type empty; } } Code:
FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (2.98 0 0); boundaryField { inlet { type cyclic; } outlet { type cyclic; } wall1 { type fixedValue; value uniform (0 0 0); } wall2 { type fixedValue; value uniform (0 0 0); } wall3 { type fixedValue; value uniform (0 0 0); } wall4 { type fixedValue; value uniform (0 0 0); } wall5 { type fixedValue; value uniform (0 0 0); } frontAndBack { type empty; } Best regards, Pascal |
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November 16, 2012, 13:04 |
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#2 |
Member
Meindert de Groot
Join Date: Jun 2012
Location: Netherlands
Posts: 34
Rep Power: 14 |
Did you have a look at the channelFoam solver?
Regarding the initial conditions, I would suggest using the perturbU utility. It generates a perturbed laminar velocity field. You should be able to find more information about it on the forums. The boundary conditions look fine, but be aware that imposing periodic boundary conditions will cause problems in the pressure field if you do not treat the pressure field in a special way (the channelFoam solver takes care of this). |
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