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Old   September 18, 2014, 17:48
Question Large Eddy Simulation
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Mohammad
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Hello Guys
Since the LES applies a spacial filter to resolve the governig equation of the flow (u= [u]+u'), the velocity values that I get from the flow field are the istantaneous value (u) or the mean velocity value ([u])?
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Old   September 19, 2014, 03:24
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Originally Posted by mohammad_mec87 View Post
Hello Guys
Since the LES applies a spacial filter to resolve the governig equation of the flow (u= [u]+u'), the velocity values that I get from the flow field are the istantaneous value (u) or the mean velocity value ([u])?
are the istantaneous values of the filtered velocity, you solve always for filtered variable that are time-dependent
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Old   September 19, 2014, 14:44
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are the istantaneous values of the filtered velocity, you solve always for filtered variable that are time-dependent


The Values Are Istantaneous?!
And How I Can Calculate The RMS Velocity Profile In LES Simulation?
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Old   September 19, 2014, 15:02
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Originally Posted by mohammad_mec87 View Post
The Values Are Istantaneous?!
And How I Can Calculate The RMS Velocity Profile In LES Simulation?

you have to compute the statistical average from the LES solution, that implies you save a sufficient number of 3D velocity fields sample at suitable time and then implement the post-processing.

Note that, by a formal point of view, the statistics of LES are not exactly those extracted from DNS or computed from RANS
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