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problems with advective bc in LES

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Old   November 26, 2019, 06:13
Default problems with advective bc in LES
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Jin Zhang
Join Date: May 2018
Location: Germany
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Dear Foamers,

I am now trying to extract the domain from previous RANS results and use the truncated domain for LES simulation. I used 20 chord as the far field for RANS. Attached is the truncated domain.
truncated domain.jpg

The inlet U and p for LES are both mapped from RANS results. in OF, we often define p as ZG for inlet, so is that possible that I defined it as fixed Value?

As the outlet is only 1 chord from the airfoil, so I want to use the convective boundary to avoid reflections. I used advective bc for U. But I don't know how to define p. should I define it as advective too? From my previous simulation, I defined it as ZG, and it showed that the results diverged from outlet.

Can anyone provide some suggestions for these problems? Thanks!!!

Best regards,
Jin
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advective, les, pressure boundary


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