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Forum: Main CFD Forum

August 12, 2012, 16:42

Replies: 10

Energy Spectrum

Views: 3,333

Posted By FMDenaro

Note that for channel flows a well-known database...

Note that for channel flows a well-known database of DNS exists, it contains profiles, RMS, (spatial) spectra.
The spectra are computed at several times and then averaged ...

Forum: Main CFD Forum

August 12, 2012, 14:49

Replies: 10

Energy Spectrum

Views: 3,333

Posted By FMDenaro

if you take the FFT of a statistically averaged...

if you take the FFT of a statistically averaged field that makes no sense!! Imagine the case of a RANS solution, you can not compute energy spectrum ....

I don't remember the examples in Matlab,...

Forum: Main CFD Forum

August 12, 2012, 04:52

Replies: 10

Energy Spectrum

Views: 3,333

Posted By FMDenaro

first, the Nyquist frequency is the highest one...

first, the Nyquist frequency is the highest one you solve in your simulation, for a well-done DNS must be of the order of the Kolmogorov one.

Try to do the spectrum of the stream-wise velocity...

Forum: Main CFD Forum

August 12, 2012, 04:00

Replies: 10

Energy Spectrum

Views: 3,333

Posted By FMDenaro

- what kind of turbulence are you simulating? -...

- what kind of turbulence are you simulating?
- how did you select the number of temporal-samples?
- are you considering the right range of frequencies until the Nyquist one?
- have you tried the...

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