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Weird Results for Launder-Gibson-RSTM

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Old   September 11, 2009, 14:29
Default Weird Results for Launder-Gibson-RSTM
Sven Schweikert
Join Date: Jun 2009
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Hello together

I'm running a simple calculation of 2D turbulent channel flow with OF standard Launder-Gibson-RSTM.

Evaluating the results wih the Log-Wall-Law there are huge differences to u+=1/kappa*log(y+)+5.5.

Before I run the RSTM calc I did the same with OFs k-epsilon model. The k-epsioln results representat almost perfect the Log-Wall-Law chracteristics.

The only differnce between the 2 cases have been the mesh. I used for the RSTM a grid with bigger first cell (y+=35).

Did anyone made similar experiences? Or have an idea were I have to tune to adjust my case for the RSTM?

Thanks for your input!

Cheers - Sven
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