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second order upwind cause divege !!

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Old   August 4, 2009, 15:00
Default second order upwind cause divege !!
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Dear friends
I`ve developed a non linear eddy viscosity model with UDF.when I use the first order upwind for all transport equations it is OK! solution converged.
But when I switch on second order upwind solution is going to diverging.up to an error "turbulent viscosity limited to....." and finally floating point.

how can I solve this diverging ?
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