|December 2, 2009, 05:17||
Using both backward timeScheme/Crank Nicholson for LES
Join Date: Nov 2009
Posts: 16Rep Power: 8
Hello OpenFOAM community ,
I'm working on LES of turbulent channel flow and I have to question about the temporal discretization.
1) I want to achive fully second order accuracy in time using the backward timeScheme for the convective term of the Navier-Stokes Equations and the Cranck Nicholson scheme for the diffusive terms.
If I select in the fvSchemes the timeScheme backward and I want to use this only for advection term while adopting the Crank Nicholson discretization for the diffusive term, then a simple advection/diffusion equation would rewrite as:
fvm:div(phi,U)+fvm:kappa*0.5*(fvm::laplacian(phi) + fvc::laplacian(phi))
is it correct in OpenFOAM ?
2) How the backward time schemes automatically take in to account at the time t=0 of the initial condition on the two levels 0 and 00 which are requested by the backward timeScheme ?
Thanks in advance
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