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-   -   nuTilda dict? (http://www.cfd-online.com/Forums/openfoam-pre-processing/99686-nutilda-dict.html)

mmcs21 April 9, 2012 18:58

nuTilda dict?
 
hi
would anyone be able to provide me with the default nuTilda dict for the 0 time directory please?

I'm hoping to run spallart sim, unfortunately i deleted all the default tutorials that would've contained this info! (i needed space on linux partition)

thanks!

lovecraft22 April 10, 2012 04:41

You could still download the whole openfoam package and you'll have everything back again:
http://www.openfoam.org/download/source.php

mmcs21 April 10, 2012 09:52

thank you but i was hoping to avoid this. I've still very limited space left on my linux partition.

I've never set up a spallart problem so the spallart-allmaras case is all i need.....

if anyone had this, that'd be great

thanks

lovecraft22 April 10, 2012 12:22

If you tell me what's the tutorial you need exactly I'll upload that for you!

mmcs21 April 10, 2012 14:51

that would be excellent thank you!

i believe it is the incompressible/simplefoam/airFoil2D tutorial

thanks
matt

lovecraft22 April 10, 2012 14:55

1 Attachment(s)
Here you go!

(Had to get rid of the polyMesh folder because the file exceeded the maximum upload dimension, hope that's ok for you!)

mmcs21 April 10, 2012 15:20

thanks!
very useful

akshaybagi April 26, 2013 03:22

nu and nuTilda
 
Can anyone please tell me what do nu and nuTilda files signify in OpenFOAM?

bscphil April 26, 2013 04:54

Quote:

Originally Posted by akshaybagi (Post 423258)
Can anyone please tell me what do nu and nuTilda files signify in OpenFOAM?


Hello,
  • "nu" stands for the kinematic viscosity in [m^2/s] with "nu= mu/rho" ("mu" = dynamic viscosity [Pa*s], "rho" = density [kg/m^3] )
  • "nut" is the turbulent viscosity (incompressible) and "mut" the turbulent viscosity (compressible)
  • "nuTilda" is a field variable only (?) for the "Spalart Allmaras turbulence model" --> look at the source code (OpenFOAM/src/turbulenceModels/incompressibe/RAS/SpalartAllmaras/SpalartAllmaras.C) or http://courses.washington.edu/mengr5...our-report.pdf ( Equation (18) )
Is this what you are looking for ???

akshaybagi April 27, 2013 03:37

ya got it thanks:)


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