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k-w SST freestream values for w

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Old   October 27, 2015, 06:29
Default k-w SST freestream values for w
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Dear all,

I want to know the freestream values of the blending function for 'w' in k-w SST.

Additional details:

I am trying to simulate the k-w SST for a two phase channel flow on MATLAB and I am having problems obtaining the accurate blending function values.

The blending function is as follows:

arg1=min(max(sqrt(k)/(0.09*w*y),500*nu/(y^2*w),4*sigma_w_2*k/(CD*y^2))

F_1=tanh(arg1^4)

Where 'y' is the nearest distance to any surface,
sigma_w_2 is a closure coefficient
CD is the cross diffusion modification


The values of F_1 should be 1 for near wall (implying k-w is switched on) & 0 for freestream values (implying k-e is switched on. However, I am obtaining incorrect values for the function. After reading through the SST model Menter mentions about freestream values for 'w'. I do not know what these values are.

If anyone does please let me know.

Thanks!
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blending function f1, freestream, k-w sst

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