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Hybrid LES/RANS init-instantaneous-vel

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Old   January 24, 2010, 13:26
Default Hybrid LES/RANS init-instantaneous-vel
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Audun Syvertsen
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I have a question that applies to hybrid LES/RANS:
I use the beta feature SAS model, although strictly an URANS it has more unsteady capabilities then regular URANS.
I model a pipe expansion, my geometry upstream of the step is a RANS zone, and the geometry in the recirculation part is an unsteady zone. Can the I still use init-instantaneous-vel to impose resolved fluctuations as initial condition. I use a uniform velocity profile at the velocity inlet, and the Fluent Theory Guide mentions that to impose resolved fluctuations as a BC is not recommended for uniform velocity inlet.
I also consider trying out DES btw
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