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Redefine First SST Blending Function

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Old   May 10, 2022, 13:27
Default Redefine First SST Blending Function
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Jonas
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TLDR

Is it possible to modify the definition of the first SST blending function in Fluent?



Problem description

I am encountering an issue where the first SST blending function remains in k-omega regime far away from the wall. My understanding is that for well-behaved flows, the first SST blending function is meant to switch to k-epsilon as soon as permissible, given the constraints of the epsilon model (so between y+ = 30 and 300?), but with some margin of safety.



Based on a manual definition of the blending function in CFD Post, I have been able to determine that this occurs due to the first sub-argument of the blending function, which is supposed to activate the k-omega model in the log-layer.


I'm currently working in CFX, where changing the blending function is definitely not possible. I'm wondering whether Fluent is more flexible in this regard.



Links to any publications with alternate blending function definitions are very welcome! Many thanks for any input on this!
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blending function f1, sst k-omega, strain rate, yplus

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