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the scheme of div(tau) in high De number

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Old   April 8, 2018, 04:41
Default the scheme of div(tau) in high De number
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A. Min
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Hi

I'm using viscoelasticFluidFoam for a shedding flow.
If I use upwind for div(tau) I will have 25% error in amplitude of oscillations.



If I use URF the problem of amplitude will be solved, but I will have a big error in Strouhal number (period time)!



And If I use any other scheme for div(tau) the solution will be diverged (without URF)!



The divergence is stated in a special point and diffuses in all of the doamin:



this is the grid in this point:





I don't know what I should do.
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