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SimpleFoam / Laminar flow / Why k & w are still required? |
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May 8, 2013, 07:27 |
SimpleFoam / Laminar flow / Why k & w are still required?
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#1 |
Senior Member
Canakkale Dardanelspor
Join Date: Aug 2012
Posts: 135
Rep Power: 13 |
Hi,
== 1 == A steady-state & laminar (Re << 100) flow case is run with simpleFoam. (Considering icoFoam is suggested to be used for only transient laminar flows in the User Guide). The turbulence modelling is kOmegaSST. == 2 == I wonder why I need to set up k and w parameters in the numerical setting even though the flow is laminar? == 3 == RASProperties/transportProperties/turbulenceProperties k&Omega Settings Many thanks in advance for any help. |
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May 8, 2013, 10:50 |
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#2 |
New Member
Join Date: Apr 2013
Posts: 7
Rep Power: 12 |
why do you want to use the kOmegaSST RASmodel for your case?
just replace "RASModel kOmegaSST;" with "RASModel laminar;" then it should work. regards |
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May 8, 2013, 11:19 |
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#3 |
Senior Member
Canakkale Dardanelspor
Join Date: Aug 2012
Posts: 135
Rep Power: 13 |
== 1 ==
Thank you very much for your answer. Simply I am confused how to properly set the laminar case. This case, however, has been computed without any error. Nevertheless, the numerical setting was not the right one to model a laminar flow as far as "k" and "omega" were input. For a future reference for the novices like me, the right setting is -the remaining above is identical-: RASProperties/transportProperties under "constant" directory. In addition, "turbulenceProperties" under "constant" directory and "k" & "omega" under "0" directory are omitted. == 2 == This arised another question, though. Why do I need to input "turbulence" keyword in the "RASProperties" file although I input "RASModel laminar;" ? When I do not input this keyword, the terminal gives me an error message: Code:
--> FOAM FATAL IO ERROR: keyword turbulence is undefined in dictionary Many thanks in advance for any reply. |
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