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Quite Beautiful - spiral tube

Posted August 8, 2013 at 06:59 by skeptik (CFD notes)

Another rare case could be so cool: good mesh, good residuals, good y+. So sad, cause it's not mine PhD work)

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It's really interesting, the U profile in spirals. At the peripheral regions flow accelerates, it needs to be investigated in light of heat transfer problems. Also, question about proper turbulence model is opened cause kOmegaSST sometimes gives wrong results in whirled and circular flows....
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Old

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
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File Type: c output.c (1.3 KB, 115 views)
File Type: c outputavg.c (2.7 KB, 223 views)
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Old

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, 356 views)
File Type: c initialize_chan.c (1.7 KB, 163 views)
File Type: c initialize_pipe.c (1.6 KB, 136 views)
File Type: c initTGV.c (1.3 KB, 149 views)
File Type: c scalefield.c (787 Bytes, 151 views)
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Old

relaxation factor

Posted July 24, 2013 at 10:38 by qing

Quote:
Originally Posted by misagh View Post
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.
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Old

As good as ICEM

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

Tetra mesh with prism layers generated in SALOME.

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