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Problem: LES results start to diverge after 10 flow-through time

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Old   November 26, 2019, 06:49
Default Problem: LES results start to diverge after 10 flow-through time
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Jin Zhang
Join Date: May 2018
Location: Germany
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Dear Foamers,

I have a quite weird problem when I run the incompressible LES for airfoil with roughness elements in Openfoam.

I monitored cl and cd, and the results went well before 10 flow-through time and it seems that it is almost converged and I planned to do time averaging. However, it started to diverge after 10 flow-through time. Is that the wrong boundary condition definitions? Attached are the nut and p contours and it seems that it started diverging from bottom boundary.

this is my boundary condition definition:
inlet: U(fixedValue), p(ZG), nut(calculated)
outlet: U(ZG), p(fixedValue 0), nut(ZG)
top&bottom: U(ZG), p(ZG), nut(ZG)

Are the boundary conditions defined correctly? Or is there any other problems which might caused divergence?

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Best regards,
Jin
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boundary conditions, divergence, les

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