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Search took 0.00 seconds. Search: Posts Made By: FMDenaro
Forum: Main CFD Forum April 29, 2016, 10:28
Replies: 14
Views: 1,101
Posted By FMDenaro
For the neutral ABL, you can find useful the...

For the neutral ABL, you can find useful the papers of Meneveau about the dynamic and anisotropic SGS models
Forum: Main CFD Forum April 29, 2016, 08:54
Replies: 14
Views: 1,101
Posted By FMDenaro
Generally, the static Smagorinsky model is...

Generally, the static Smagorinsky model is supplied by a damping function in wall-normal direction to take into account the anisotropy but that makes sense for a well refined grid near the wall.
I...
Forum: Main CFD Forum April 29, 2016, 07:55
Replies: 14
Views: 1,101
Posted By FMDenaro
if you use pseudospectral codes then it is likey...

if you use pseudospectral codes then it is likey you resolve non-homogeneous and non isotropic turbulence, therefore it is not correct to immagine a single lenght scale.
For example, in a channel...
Forum: Main CFD Forum April 28, 2016, 14:30
Replies: 14
Views: 1,101
Posted By FMDenaro
yes, Lele showed that for some compact schemes...

yes, Lele showed that for some compact schemes based on Padè interpolation.

However, my warning is to consider such analysis somehow academic, in practical cases the relevance of the spectral...
Forum: Main CFD Forum April 28, 2016, 11:43
Replies: 14
Views: 1,101
Posted By FMDenaro
if you are interested in, I have a file with the...

if you are interested in, I have a file with the spectral analysis of many formulas
Forum: Main CFD Forum April 28, 2016, 10:59
Replies: 14
Views: 1,101
Posted By FMDenaro
I forgot to say that the "modified wavenumber...

I forgot to say that the "modified wavenumber analysis" leads to see the "spectral accuracy" of the formula. Actually, (k-keff) is nothing else but the local truncation error in the wavenumber space
Forum: Main CFD Forum April 27, 2016, 16:39
Replies: 14
Views: 1,101
Posted By FMDenaro
[f(x+dx/2)-f(x-dx/2)]/dx= ...

[f(x+dx/2)-f(x-dx/2)]/dx=
1/(dx)*c(k)*[exp[i*k*(x+dx/2)]-exp[i*k*(x-dx/2)]=
c(k)*exp(i*k*x) *[exp(i*k*dx/2) - exp(-i*k*dx/2)]/dx=
f(x)*i*sin(k*dx/2)/(dx/2)= i*k_eff*f(x)

you see now that
...
Forum: Main CFD Forum April 27, 2016, 16:18
Replies: 14
Views: 1,101
Posted By FMDenaro
I do not understand the figure ... you should...

I do not understand the figure ... you should have the transfer function starting from 1 at k=0, then it should be plotted along the dx*k variable...

for example f(x) = c(k)*exp(i*k*x) -> f'(x) =...
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