Problem with large time scale and minute length scale -- CFD Online Discussion Forums

August 23, 2016, 07:39	Problem with large time scale and minute length scale	#1
mech_engg_swag New Member Parth Thakkar Join Date: Mar 2016 Posts: 7 Rep Power: 10	Hi all, I'm simulating flow in a porous media, using solver buoyantBoussinesqPimpleFoam with porous resistance added to NS equations. The Kolmogorov Time scale for my problem is around 200 seconds, and the length scale is around 1 micrometer. The total time for observation is 40000 seconds, and my domain size is 10.2 cm * 5.1 cm * 0.051 cm. How important is the Courant Number limit for PIMPLE algorithms? If it is important, how do I avoid violating it with such a large time-step and such a minute mesh-cell length? Is there a work-around for this problem? What should be my time-step and mesh-size? Thanks in advance

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