Forum: Main CFD Forum
October 21, 2016, 10:48
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
October 20, 2016, 06:32
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
October 20, 2016, 06:15
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Replies: 107
Views: 49,929
The law -5/3 is only a theoretical results for...
The law -5/3 is only a theoretical results for the inertial cascade in a homogeneous isotropic field. You are very far from such a case. The -5/3 is only an arbitrary reference to see the difference...
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Forum: Main CFD Forum
October 20, 2016, 06:11
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Replies: 107
Views: 49,929
First, I am talking about the central second...
First, I am talking about the central second order ubounded scheme. Despite the automatic switching to bounded when you active LES, you can force the unbounded version by command. I do not remember...
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Forum: Main CFD Forum
October 20, 2016, 05:23
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
October 20, 2016, 05:17
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Replies: 107
Views: 49,929
Your questions mix many issues... LES means...
Your questions mix many issues... LES means nothing if you do not specify the type of tools (filtering, discretization, SGS model). If you used Fluent I am not so suprised that the LES solution can...
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Forum: Main CFD Forum
October 20, 2016, 03:18
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Replies: 107
Views: 49,929
Here the file for Re_tau=590 ...
Here the file for Re_tau=590
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# The data in this file was extracted from a direct numerical
# simulation of fully developed plane turbulent channel
# flow....
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Forum: Main CFD Forum
October 19, 2016, 18:21
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
October 19, 2016, 18:16
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Replies: 107
Views: 49,929
Just as example of the effects in the BL, I...
Just as example of the effects in the BL, I suggest to check the existing DNS database for the plane channel flow, you can plot the spectra computed from y+=5 up to the final y+ in the centerline.
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Forum: Main CFD Forum
October 19, 2016, 13:53
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Replies: 107
Views: 49,929
but in DES, as you wrote, near the wall you...
but in DES, as you wrote, near the wall you switch to RANS formulations, so it is no longer meaningful to compute the energy spectra...
Comparing LES and DES can have some merits but I think you...
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Forum: Main CFD Forum
October 19, 2016, 13:04
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Replies: 107
Views: 49,929
sorry to say that you are out of the right...
sorry to say that you are out of the right way...LES and RANS are not different turbulence model but different formulations in which you compute different variables. Furthermore, in RANS you cannot...
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Forum: Main CFD Forum
October 19, 2016, 12:13
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Replies: 107
Views: 49,929
Your geometry is quite complex ...honestly, I...
Your geometry is quite complex ...honestly, I would not advice to perform the spectral analysis. What is your goal in computing the spectra? you will get (expecially at low r+) spectra very different...
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Forum: Main CFD Forum
October 19, 2016, 10:43
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Replies: 107
Views: 49,929
If you have inflow/outflow BC.s, then the only...
If you have inflow/outflow BC.s, then the only periodic direction is the azimuthal one. Thus, I suppose you can proceed as follow:
1) establish some longitudinal positions far from the inflow;
2)...
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Forum: Main CFD Forum
July 16, 2015, 03:29
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
April 21, 2014, 04:40
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
April 21, 2014, 04:18
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
April 21, 2014, 03:17
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
September 6, 2013, 06:37
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Replies: 107
Views: 49,929
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Forum: Main CFD Forum
February 9, 2013, 04:01
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Replies: 107
Views: 49,929
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