High density gradient convergence -- CFD Online Discussion Forums

April 17, 2020, 05:39	High density gradient convergence	#1
HorstvanGrass Member Horst van Gras Join Date: Oct 2018 Posts: 45 Rep Power: 7	Hi, I'm simulating a combustion using DDES turbulence model. I have high density gradient which causing instabilities for solving. To counter that I had to reduce my density under-relaxation factor under 0.1. For stationary solution this converge after some time, however for the transient I need to much iteration to get an acceptable convergence. But when increasing the density relaxation factor, the solution divergence again. Is there a tool in fluent to counter this this high density gradient without setting the relaxation so low? Thx in advance!

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