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Alternative wall functions in turbulents model

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Old   December 21, 2017, 04:25
Default Alternative wall functions in turbulents model
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Hello!

I'm new in simulation world and I have a question related to a warning message that appear when I check the case that I want to solve.


WARNING: The mesh contains high aspect ratio quadrilateral, hexahedral, or polyhedral cells. The default algorithm used to compute the wall distance required by the turbulence models might produce wrong results in these cells. Please inspect the wall distance by displaying the contours of the 'Cell Wall Distance' at the boundaries. If you observe any irregularities we recommend the use of an alternative algorithm to correct the wall distance. Please select /solve/initialize/repair-wall-distance using the text user interface to switch to the alternative algorithm.

I selected solver Reynolds Stress Model and I put scalable as wall function because this option allow to disable the wall functions when y* is low. When I saw the warning messege I activated the alternative algorithm but I don't know if Fluent was solving correctly the elements close to wall.

Any idea that Fluent are doing in elements close to wall? Or how I can avoid this warning message?

Best regards.

Rafael
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alternative algorithm, aspect ratio, turbulent model


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