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-   -   what is nutilda? (http://www.cfd-online.com/Forums/openfoam/79609-what-nutilda.html)

maysmech August 28, 2010 09:52

what is nutilda?
 
Dear Foamers,

What is nutilda? i found it in 0 folder of les and kepsilon of pisoFoam tutorial (also other solvers).
what should be its value in boundaries: wall, inlet, outlet ?

Best,

cnsidero August 28, 2010 20:22

nuTilda is for the Spalart-Allmaras turbulence model (the value solved for that determines the turbulent vicosity). See: http://www.cfd-online.com/Wiki/Spalart-Allmaras_model

The nuTilda file will ignored unless you have enabled the SA turbulence model.

maysmech August 29, 2010 10:24

Quote:

Originally Posted by cnsidero (Post 273207)
nuTilda is for the Spalart-Allmaras turbulence model (the value solved for that determines the turbulent vicosity). See: http://www.cfd-online.com/Wiki/Spalart-Allmaras_model

The nuTilda file will ignored unless you have enabled the SA turbulence model.

Thanks,
do you mean it is not important when using k-e, LES & ... turbulence methods?
it is available in o folder of these tutorials.
also tell me about "nut" and "nusgs" if possible.
Regards,
Maysam

HakikiCanakkaleli August 28, 2012 09:38

nuSgs is the choice of wall function for the incompressible LES. Simply, kinematic viscosity.

Check it out? http://www.openfoam.org/docs/user/turbulence.php

Sagun October 11, 2012 11:26

Hello everyone,

In continuation with the topic, how does one determine the values of kqRWallFunction and epsilonWallFunction?

Thanks,
Sagun


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