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Old   August 23, 2012, 05:45
Default What model of turbulence choose to study an external aerodynamics case
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Hello everyone,

I'm pretty new in cfd so maybe you'll find my questions basics. What model of turbulence choose to study an external aerodynamic case?

Here is my situation:
I want to model the aerodynamic track of a ship to investigate its effect on a helicopter during landing at the back of the ship. The wind upstream is equal to 12.85 m/s. And my Reynolds number is 10^6-10^7.
My Mesh refinement is not really good but I can't make better because of my computer. I use boundary condition type fan to model the helicopter's rotor.

Until Today I use standard K-Epsilon (High Re) model to perform my calcul but now I'm more experienced and I believe I should use K-Omega SST model. I try to use K-Omega SST model but my results are completely different and it seems that the results are less consistent than for the standard K-Epsilon model. Is it normal?

EDIT: I used simpleFoam to compare the 2 models of turbulence.

Please can you give me your opinion? Maybe I should try an another model of turbulence like K-epsilon (Low Re)

It's been 2 months since I have worked on the standard k-Epsilon model and and I do not need to have a good accuracy for my results. I just want the good behavior of the air. The standard K-Epsilon I used is it enough?


Last edited by raffale; August 24, 2012 at 04:16.
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