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How to set up freestream turbulence conditions in incompressible solver |
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August 12, 2020, 19:15 |
How to set up freestream turbulence conditions in incompressible solver
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#1 |
New Member
Join Date: Aug 2013
Posts: 7
Rep Power: 13 |
I found the following solution works thanks to pcg. Hope this is helpful.
% Freestream turbulence intensity value (default 0.05), activated for SST only FREESTREAM_TURBULENCEINTENSITY=0.01 % % Freestream nut / nu (default 10), activated for SST only FREESTREAM_TURB2LAMVISCRATIO=215.56 % % Freestream nu_tilde / nu (default 3), activated for SA only FREESTREAM_NU_FACTOR=215.568 --- % Original post as follows Hi everyone, I am running the incompressible RANS solver on a linear compressor cascade case (M=0.12, Rec=3.82*10^5). I tried to feed in the eddy viscosity ratio and the turbulence intensity in the configure file (see attached) as follows: FREESTREAM_TURBULENCEINTENSITY=0.01 FREESTREAM_TURB2LAMVISCRATIO=215.56 However, these values seemed not readed in, and I got nut/nu=0.20 in the freestream (see fig attached). I checked some archived tutorial cases. It seems to me the above options are activated only for compressible RANS solver, but I am not sure if that is true and why it is implemented in this way. Do you have any ideas? Cheers, Xiao Last edited by hx293; August 13, 2020 at 08:16. |
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August 13, 2020, 07:02 |
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#2 |
Senior Member
Pedro Gomes
Join Date: Dec 2017
Posts: 466
Rep Power: 14 |
Looking at the code it seems you should use FREESTREAM_NU_FACTOR
The two options you tried seem to be applicable only to k-omega models. P.S. In principle there are no differences between compressible and incompressible solver, so far as turbulence models go. Last edited by pcg; August 13, 2020 at 07:03. Reason: more info |
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