the result of pitzDaily using simpleFoam and pisoFoam

Kr_kim · February 15, 2010, 13:12

Dear Formers

I've performed bunch simulations for pitzDaily case(Experimental inlet and directMapped etc.) using simpleFoam and pisoFoam.
However, the results, especially streamwise mean velocity profile are pretty
different even at tutorial case between two solvers. I've simulated locDynOneEddy, OneEddy, Spalart-Allmaras(LES), and k-epsilon, kOmegaSST, SpalartAllmaras(RAS)

Weirdly, RANS results is better than those of LES.

I suspect that pisoFoam is not correct.

Are there any observation from this type of simulations?

Thanks

Kyungrock

pg22 · March 16, 2010, 13:38

One thought: are the RANS and LES cases grid independent?

I have run the tutorial cases in OF 1.5 and also noticed the large differences in the results. However, the grid is the same for both cases. For the LES case it is likely that a finer grid is required.

February 15, 2010, 13:12	the result of pitzDaily using simpleFoam and pisoFoam	#1
Kr_kim New Member Kyungrock Kim Join Date: Jun 2009 Posts: 20 Rep Power: 16	Dear Formers I've performed bunch simulations for pitzDaily case(Experimental inlet and directMapped etc.) using simpleFoam and pisoFoam. However, the results, especially streamwise mean velocity profile are pretty different even at tutorial case between two solvers. I've simulated locDynOneEddy, OneEddy, Spalart-Allmaras(LES), and k-epsilon, kOmegaSST, SpalartAllmaras(RAS) Weirdly, RANS results is better than those of LES. I suspect that pisoFoam is not correct. Are there any observation from this type of simulations? Thanks Kyungrock

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March 16, 2010, 13:38		#2
pg22 New Member Paul Garlick Join Date: Mar 2009 Location: Bournemouth, UK Posts: 27 Rep Power: 17	One thought: are the RANS and LES cases grid independent? I have run the tutorial cases in OF 1.5 and also noticed the large differences in the results. However, the grid is the same for both cases. For the LES case it is likely that a finer grid is required.