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Useful LES tools in Fluent - Part 2

Posted August 2, 2013 at 04:27 by sbaffini (NuTBox)

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, 56 views)
File Type: c outputavg.c (2.7 KB, 78 views)
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Useful LES tools in Fluent - Part 1

Posted August 2, 2013 at 04:15 by sbaffini (NuTBox)

Here i collect some very basic tools i used when performing basic LES computations in Fluent.

1) Custom field function for the Q criterion (q_crit.txt, to be renamed in .scm). Some Fluent versions (12, 13 and maybe 14) only have a "Normalized Q criterion" scalar, while previous ones simply don't have it at all. This custom field function is what i used in those dark days.

2) Several initialization routines (init*.c and scalefield.c) fully described in the files...
Attached Files
File Type: txt q_crit.txt (2.3 KB, 83 views)
File Type: c initialize_chan.c (1.7 KB, 52 views)
File Type: c initialize_pipe.c (1.6 KB, 54 views)
File Type: c initTGV.c (1.3 KB, 52 views)
File Type: c scalefield.c (787 Bytes, 61 views)
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Q-criterion isosurfaces in MATLAB

Posted July 1, 2013 at 11:33 by sbaffini (NuTBox)

Let us suppose you have the following matrices:

x(nx,ny,nz): x coordinates of your grid

y(nx,ny,nz): y coordinates of your grid

z(nx,ny,nz): z coordinates of your grid

dudx(nx,ny,nz): x-wise derivative of x-wise velocity component

dudy(nx,ny,nz): y-wise derivative of x-wise velocity component
.
.
.
dwdz(nx,ny,nz): z-wise derivative of z-wise velocity component

This is, more or less, how i...
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Basic finite volume tools

Posted July 1, 2013 at 11:29 by sbaffini (NuTBox)

At the following link:

http://rapidshare.com/files/1564297057/UFVMOM.rar

there is a basic MATLAB tool to handle unstructured finite volume grids (fluent .msh or .cas files) and to perform basic interpolations, gradient computations, plots etc. No actual FV computation is ever performed or implemented, however, the main structure of the code is clearly there.

GENERAL DESCRIPTION

The tool is actually a collection of functions, grouped by tasks...
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LES in Fluent: channel flow test case

Posted July 1, 2013 at 11:12 by sbaffini (NuTBox)

A paper produced for a national conference. Some basic details of the LES in Fluent are covered, together with the main setup:

http://www.lamc.ing.unibo.it/aimeta2.../MEM-273-0.pdf
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