Time-discretization of convective/diffusive terms -- CFD Online Discussion Forums

August 23, 2021, 07:08	Time-discretization of convective/diffusive terms	#1
tzaht Member Tony Zahtila Join Date: Mar 2016 Posts: 33 Rep Power: 10	Hi, Often when I read the numerical methodology of various direct numerical simulation solvers, I see a separate treatment of the convective and diffusive terms. Something like, "One possible approach is to use Crank-Nicolson (CN) for the diffusion term and third-order Adams-Bashforth (AB3) for the convection term" I am just wondering why this isn't the case in OpenFOAM? It seems that all terms (aside from ddt) are treated and the previous time-step.

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