Courant Number Increases Rapidly

najunaju · March 29, 2013, 06:06

I am using kwsst turbulence model, I run some simulations with mesh, it had max mesh skewness 1.8E-08. These simulations converged very well and courant number was 0.5 throughout the case.

But when the same settings I run with a mesh whose max mesh skewness is 3.5 the cournat number increases gradually and reaches a very high value.

I am using Gauss Upwind schemes. Does any body knows is this the effect of skewness? if so What schemes I may use to get converged simulation.

Any kinds of help will be highly appreciable.

Best,

olivierG · April 2, 2013, 06:47

hello,

You could try "skewCorrected" instead of upwind.

regards,
olivier

March 29, 2013, 06:06	Courant Number Increases Rapidly	#1
najunaju New Member Md. Naimul Haque Join Date: Jan 2013 Posts: 14 Rep Power: 13	I am using kwsst turbulence model, I run some simulations with mesh, it had max mesh skewness 1.8E-08. These simulations converged very well and courant number was 0.5 throughout the case. But when the same settings I run with a mesh whose max mesh skewness is 3.5 the cournat number increases gradually and reaches a very high value. I am using Gauss Upwind schemes. Does any body knows is this the effect of skewness? if so What schemes I may use to get converged simulation. Any kinds of help will be highly appreciable. Best,

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April 2, 2013, 06:47		#2
olivierG Senior Member Olivier Join Date: Jun 2009 Location: France, grenoble Posts: 272 Rep Power: 18	hello, You could try "skewCorrected" instead of upwind. regards, olivier