time steps in LES
could someone give me a good method to set a correct time step in LES simulations. The only infos given by the manual says : "under 20 iteration to converge"
i'm not sure this is a good argument to put in a scientific work :) I've tried using a CFL condition witch could be interpreted as : "the information cannot jump to the next cell during one time step" but the CFL conditions given in the manual refers to the coupled solver and i use the segregated one. any idea ? |
Re: time steps in LES
You can just consider the max. streamwise velocity and the smallest cell size in the same direction to evaluate a time step (this will be cfl~1).
For exemple channel flow with streamwise x direction with vmoy ~1 and DeltaX =0.01 => Delta t= 0.01 .... |
Re: time steps in LES
that's what i'm actually using, while adapted after some readings to CFL=0.3
but this is true only for stability in explicit time integration, is there a good justification for this in an implicit second order time integration ? |
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