# Entries for July 2013

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## relaxation factor

Posted July 24, 2013 at 10:38 by qing

Quote:
Originally Posted by misagh
hi,we have under relaxation factor(<1) and also over relaxation factor(>1).
how to adjust the factors is so complicated and cant be explained easily.
you can visit this address:
www.bakker.org/dartmouth06/engs150/05-solv.ppt
p.p 16-17-...
i found it really useful.
best regards.
it is worth to take a time to read.
New Member
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## As good as ICEM

Posted July 19, 2013 at 06:13 by skeptik (CFD notes)

Tetra mesh with prism layers generated in SALOME.

Member
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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...
Senior Member
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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...
Senior Member
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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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