Does anyone know of a way to model roughness through the walls of a channel for both laminar and turbulent flow in ansys fluent?
Not sure if it is suitable:
Is this method equitable to roughness heights by using an Ra value?
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And what is now going wrong? Provide more information about boundary, conditions and your judgment of the result.
The problem I am facing, is that when I add a roughness factor on the walls, the pressure differential is decreasing rather than increase. The center of the model is an air fluid region with a mass flow rate inlet and pressure outlet. The fluid is surrounded by aluminum walls with a constant heat flux on the top wall and insulated on the left and right wall as well as the bottom. I am not sure why this is the case? I was questioning my mesh being too course and possibly giving invalid results. Or a possible error in the settings:
· Turbulent: Viscous-Standard K-Epsilon approximation.
· To model forced convection, the density was set to as a model approximation to assume incompressible ideal-gas
· Operating pressure: 98,338.2 Pascal (14.2 PSI)
· Gauge Pressure at outlet: -1112.3 Pascal (-.16 PSI)
Which near wall method are you using? Do you exp. data or any correlations?
I was using the scalable near wall function. I am trying to simulate this and will be experimentally be verifying the results. I just don't understand why the wall height i place isn't following the predicted trend for pressure differentials
can you tell me what settings were used for this turbulent model? For some reason, my pressure differential is decreasing as the roughness is increasing. I see the K-Epsilon model, realizable model was used, but is there something else I should be aware of?
1/It is up to you to choose the most suitable meshing method. Just fulfill the mesh metric quality requirements: Aspect Ration, Cell Volume Change, Skewness and Ortho Quality.
2/Create an iso-surface based on Mesh>X-Coordinate
Hi, can you provide reference for this statement please? Thanks.
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