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RANS for Moving Wall Boundaries

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Old   May 27, 2017, 17:04
Default RANS for Moving Wall Boundaries
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Hi,

Has anyone used RANS for simulating any moving boundaries (no slip walls)? What are disadvantages of RANS for such problems? I am dealing with separations at the wall as well.

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Old   May 28, 2017, 06:17
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Filippo Maria Denaro
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You should consider URANS ... A similar flow problem where URANS is quite common is the flow motion during the cycle of a piston in a cylinder. Check in literature for that
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Old   May 29, 2017, 08:01
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A known RANS/URANS model that can treat separation effects is the two-layer k-epsilon. But I don't know if it is good for moving wall.
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Old   May 29, 2017, 11:26
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Quote:
Originally Posted by FMDenaro View Post
You should consider URANS ... A similar flow problem where URANS is quite common is the flow motion during the cycle of a piston in a cylinder. Check in literature for that
Oh, thanks! By RANS I meant URANS. I will check out the piston motion literature.
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Old   May 29, 2017, 11:31
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Quote:
Originally Posted by venturi View Post
A known RANS/URANS model that can treat separation effects is the two-layer k-epsilon. But I don't know if it is good for moving wall.
Thanks Venturi for your reply. Most k-e models use damping functions for low Re numbers and apparently this causes many issues. But thanks for your comment, I will read more about it.

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boundary layer, des turbulence model, moving bc, rans modelling, separating wall

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