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y+ calculator for equilibrium flows

Posted April 10, 2014 at 03:58 by sbaffini (NuTBox)
Updated December 21, 2016 at 10:08 by sbaffini

y+ calculation is, possibly, the most pervasive topic among CFD practitioners and, certainly, anybody doing CFD for more than a month already has his own tool to compute it.

Still, all the y+ calculators i am aware of rely on a very specific flow condition, namely, a flat plate boundary layer. This is probably the most common practical case but not the only option. For example, the fully developed flow in a pipe is cretainly different and possibly requires a different input for the...
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File Type: xlsx yplus.xlsx (12.6 KB, 247 views)
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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...
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File Type: c remap_par.c (14.4 KB, 365 views)
File Type: pdf remap.pdf (24.2 KB, 521 views)
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Useful LES tools in Fluent - Part 3

Posted October 21, 2013 at 07:06 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, 212 views)
File Type: c svd_sgsmut.c (2.3 KB, 175 views)
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Useful LES tools in Fluent - Part 2

Posted August 2, 2013 at 04:27 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, 128 views)
File Type: c outputavg.c (2.7 KB, 340 views)
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