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LES Anything concerning Large Eddy Simulation
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Ph.D. Thesis on LES

Posted May 1, 2014 at 13:24 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini

I recently defended my thesis on Large Eddy Simulation, which is now available at:

http://hdl.handle.net/10589/89603

I won't spend too much words on promoting it, you can read the abstract for this. I just want to say it possibly provides a fresh view on the matter of implicit/explicit filtering, commutation errors and other evergreen topics in LES. As i put a specific effort on this, i also hope that it might work as a not too heavy introduction on LES in general. Finally,...
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LESinItaly database

Posted March 19, 2014 at 13:20 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini

The LESinItaly database for the turbulent channel flow at Re_tau=590 is available at:

http://www.cfdlab.polimi.it/Research/LESinItaly.tar.gz
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Useful LES tools in Fluent - Part 4

Posted March 7, 2014 at 03:59 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini

This is a routine to perform a remap of fields from an interior surface to an inlet surface during the computation. In practice this can be used to produce an LES inflow belonging to the class of the so called "precursor methods". Still, this is actually done in parallel with the main computation and not in advance.

The attached pdf file contains an explanatory image of the method while the .c routine should be sufficiently commented to be readily usable by anyone who actually...
Attached Files
File Type: c remap_par.c (14.4 KB, 710 views)
File Type: pdf remap.pdf (24.2 KB, 811 views)
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Useful LES tools in Fluent - Part 3

Posted October 21, 2013 at 08:06 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini (Update)

These are the implementations of two static SGS models, due to Vreman and Nicoud (see the attached files for the detailed references). These models are in the same spirit of the well known WALE model; still, they are different in several aspects.

The models are provided without any kind of warranty; still, no specific problem came up during testing.

For wall bounded turbulent flows in Fluent i strongly suggest the Vreman model due to its specific, theoretically wrong, near...
Attached Files
File Type: c vreman.c (1.7 KB, 490 views)
File Type: c svd_sgsmut.c (2.3 KB, 333 views)
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Useful LES tools in Fluent - Part 2

Posted August 2, 2013 at 05:27 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:09 by sbaffini

A couple of routines i regularly use to output solution files in more manageable ascii files for post-processing in MATLAB. Of course this only makes sense when working in simple geometries where cells have regular patterns (e.g., simple boxes for computations in channels and ducts).

1) output.c: Used to dump an instantaneous field file

2) outputavg.c: Used to dump an averaged field file

More details can be found in the files
Attached Files
File Type: c output.c (1.3 KB, 278 views)
File Type: c outputavg.c (2.7 KB, 715 views)
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