Utility to initialize LES Simulation
I want to use my previous RANS results as an initial field for my LES simulation in an external flow problem.
As you know in the ANSYS FLUENT, there is a:
is there any analogous utility (available in OpenFOAM or written by users) that generate instantaneous velocity field from the mean RANS results for external flows?
Any help regarding this matter is appriciated
Thanks in advance
you can create two cases: RANS and LES
then using mapField utility to map result from RANS to LES
I know about mapField utility. since I use the same mesh for both RANS and LES, I can simply replace my last time step from RANS to 0 folder in LES without using mapField.
My problem is that RANS calculations only gave mean values but for LES we need instantaneous values (mean+fluctuations). as I told in the 1st post in ANSYS FLUENT we can add random fluctuations to our previous RANS results by
I know that for channel flow there is a utility called PerturbU that is written by Eugene De Villers for LES initializations.
Is there a similar utility for External Flows?
can mapField utility add random fluctuations to our entire field?
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