Wrong boundary conditions?
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Hello Foamers,
I want to simulate the flow through a heat exchanger and have already implemented the geometry in OpenFoam. One part of the heat exchanger looks like the letter U. In this area I got the attached result. The picture shows a slide through the pipe. I am confused about the flow pattern, because I expected an increase of the velocity at the edge of the curved tube. Can this be caused by the boundary conditions? Simulation with: SimpleFoam + k-epsilon for turbulence Boundary conditions: U: boundaryField { inlet { type fixedValue; value uniform (1.088250128 0 0); } outlet { type zeroGradient; } Walls { type fixedValue; value uniform (0 0 0); } symmetric { type symmetryPlane; } frontAndBack { type empty; } } p: dimensions [0 2 -2 0 0 0 0]; internalField uniform 101.3; boundaryField { inlet { type zeroGradient; } outlet { type fixedValue; value uniform 101.3; } Walls { type zeroGradient; } symmetric { type symmetryPlane; } frontAndBack { type empty; } } The frontAndBack-Patch is not in use anymore. Thanks for your help and good ideas, Thomas |
Hello Thomas,
I am a beginner in OpenFOAM but for me the boundary conditions look okay and I also agree to you that the results look strange. I would would expect an increase of the velocity. The only thing is, I would change the pressure outlet boundary condition to "$internalField" than "uniform 101.23". What is your convergence criteria and the "symmetric" part of your geometry? Regards, Alex |
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