# Large Eddy Simulation

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 September 18, 2014, 17:48 Large Eddy Simulation #1 New Member   Mohammad Join Date: Jun 2014 Location: Tehran/Iran Posts: 21 Rep Power: 4 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])?

September 19, 2014, 03:24
#2
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Filippo Maria Denaro
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Quote:
 Originally Posted by mohammad_mec87 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

September 19, 2014, 14:44
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Quote:
 Originally Posted by FMDenaro 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?

September 19, 2014, 15:02
#4
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Filippo Maria Denaro
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Quote:
 Originally Posted by mohammad_mec87 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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