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December 7, 2017, 05:07 |
calculate an appropriate nutilda value
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#1 |
Member
hulli graemer
Join Date: Oct 2014
Posts: 48
Rep Power: 11 |
Hi all,
I am really sick of this problem. Can anybody tell me how to calculate an appropriate nutilda (for SpalartAllmaresDDES) value that I can assign to the internal field? I am asking this because I found out that nutilda of 0.0 at the inlet and the internalfield remain zero even, if I have a highly fluctuating flow in the U filed. However, if I precondition the field with a super small nutilda value of 1e-38 I end up with an appropriate nutilda field. I read sth about a floting point issue. It would be great if that could be clarified by anyone and how nutilda relates to the eddy viscosity ratio? Best H |
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eddy viscosity, nutilda, spalart allamaras |
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