CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Weird Results for Launder-Gibson-RSTM (http://www.cfd-online.com/Forums/openfoam-solving/68255-weird-results-launder-gibson-rstm.html)

svens September 11, 2009 14:29

Weird Results for Launder-Gibson-RSTM
 
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


All times are GMT -4. The time now is 18:32.