[mmcs21]

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]

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

[mmcs21]

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]

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

[mmcs21]

that would be excellent thank you!

i believe it is the incompressible/simplefoam/airFoil2D tutorial

thanks
matt

[lovecraft22]

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]

thanks!
very useful

[akshaybagi]

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

[bscphil]

Originally Posted by akshaybagi

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]

ya got it thanks

[Esther Jin]

Hello,

Does it mean if I don't use "Spalart Allmaras turbulence model", it's not necessary to have nuTilda Dict in 0 folder?

Does nuSgs Dict needed for LES simulation?

Thank you!