[sahm]

Dear All

Recently I have been running some cases with OpenFoam for a backward facing step. In these cases, I tried to keep the Re=500 and change Ma from 0.1 to 0.4, In all the cases the T=224K was fixed. so Vi and h was calculated with Ma and Re constraints respectively.
The attached graphs shows the change in the Normalized velocity Vx versus normalized height in section x/h=1 in all the cases. I know why the normalized velocity is increased as seen the graph section1.pdf
Then I tried to do the same case with Fluent. but when I created this graph, I saw a big difference between Fluent and OpenFoam results, as seen in file OpenFoam-Fluent-1-2.pdf. Can anybody tell me why this big difference happens.
I tried the fluent case with 2nd order calculations, as seen in graph OpenFoam-Fluent-1-2nd.pdf but as you see, the profile doesn't change that much. Now I`m trying to run the same case in OpenFoam with second order calculations (If I find how to do it)
Can anybody help me with this problem. If you want to know, I can send you more details about the cases.

[Ruehri]

Dear Sahm,

I have also found relatively huge differences between OpenFOAM and Fluent in compressible flow. Which Solvers did you use?