The selecion of turbulent model in compressible supersonic jet

Leeoo · December 22, 2014, 10:07

Dear Friends,
I want simulate the compressible supersonic jet in Laval tube by CFD. I have used the standard k-e, realizable k-e, standard k-w and sst k-w turbulent model, but the simulation results of the above turbulence models were all different. Can someone tell me which turbulence model I should choose?
I really hope to get reply！

Hamidzoka · December 25, 2014, 14:43

please let me know:

1- Did you use standard formulation of the turbulence models mentioned or a revised formulation which considers compressibilty effects of fluid flow? Generally in reference text books incompressible turbulence models are formulated.

2- what do you expect of the results and how the turbulence models are different in their predictions? are there some unrealistic results?

results

harishg · December 26, 2014, 20:36

The SST model is known to perform well for these flows. However, there may be newer models which give improved predictions. I would suggest you do perform a literature search over the past 6-8 years on similar simulations and then decide on the model.

December 22, 2014, 10:07	The selecion of turbulent model in compressible supersonic jet	#1
Leeoo New Member Leeoo Join Date: Dec 2014 Posts: 4 Rep Power: 11	Dear Friends, I want simulate the compressible supersonic jet in Laval tube by CFD. I have used the standard k-e, realizable k-e, standard k-w and sst k-w turbulent model, but the simulation results of the above turbulence models were all different. Can someone tell me which turbulence model I should choose? I really hope to get reply！

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December 25, 2014, 14:43		#2
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 282 Rep Power: 18	please let me know: 1- Did you use standard formulation of the turbulence models mentioned or a revised formulation which considers compressibilty effects of fluid flow? Generally in reference text books incompressible turbulence models are formulated. 2- what do you expect of the results and how the turbulence models are different in their predictions? are there some unrealistic results? results

December 26, 2014, 20:36		#3
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	The SST model is known to perform well for these flows. However, there may be newer models which give improved predictions. I would suggest you do perform a literature search over the past 6-8 years on similar simulations and then decide on the model.