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May 17, 2012, 19:18 |
comparison with DNS
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#1 |
New Member
hars
Join Date: May 2012
Posts: 4
Rep Power: 13 |
I have been trying to perform CFD analysis of isotropic turbulence using LES like scheme. In order to compare my results with DNS,should I be finding the parameters like intergral length scale(to find turn over time) from my scheme or take the DNS value. Thanks a lot......
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May 18, 2012, 04:17 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
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Quote:
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May 18, 2012, 17:44 |
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#3 |
New Member
hars
Join Date: May 2012
Posts: 4
Rep Power: 13 |
Hi, thanks a lot for the reply.... when i want to plot the total energy for example, the time axis is generally non-dimensionalized which involves a length scale(integral length scale). should i obtain this value from a DNS or calculate from my code?... thnx a lot
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May 19, 2012, 04:16 |
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#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
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in homogeneous isotropic flows the characteristic lenght scale is generally the Taylor micro-scale lambda, on whcih the Reynolds number of the computation is based too. Use information from DNS as in LES you have a cut-off of the smallest scales (only scales in the inertial range are computed) and you cannot compute the Taylor length.
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May 21, 2012, 18:37 |
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#5 |
New Member
hars
Join Date: May 2012
Posts: 4
Rep Power: 13 |
thanks a lot for clarifying......
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