So guys, I try to do a comparative study using RANS, DES, and LES turbulence models in the geometry image below.
The boundary conditions are inlet, outlet and the rest of edges I set as wall. I dont use symmetry. Where a dotted line I set up as a wall.
First for the RANS approach I just solve a transient flow with SST k-omega model.
For the DES approach, first I solve the initial flow with SST k-omega as steady state with some iterations, after I set the viscous model to DES and calculate the transient flow.
For the LES approach, in the same way as use in DES approach, I solve the initial flow with SST k-omega as steady state and after I set the viscous model to LES. But it do not work. I try to switchon using the code ( (repsetvar 'les-2d? #t) ) and dont work! So, I dont know what's the problem...
I know the LES model is suitable for 3D and can cause non-physical 2D results. Even because, even if the flow in which the mean velocity and pressure vary in only one or two spatial dimensions, turbulent fluctuations always have three-dimensional spatial characteristics.
What's can be the problem? The LES is not available to ANSYS Fluent 17.2 or need some other setup?
Somebody help me? Thanks guys!
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The command is correct and there shouldn’t be any issues running LES on 2D cases. Did you try using the inverted apostrophe instead of the regular apostrophe in front the “les”? The inverted apostrophe would the symbol along with the approximate symbol on the left side of the keyboard.
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