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LESinItaly database

Posted March 19, 2014 at 13:20 by sbaffini (NuTBox)

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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Rotating diverging flow, validation

Posted March 19, 2014 at 07:29 by skeptik (CFD notes)

I've found interesting article about experimental investigation of a rotating diverging flow.

http://www.lmfa.ec-lyon.fr/ISAIF/Dat...AIF8-00105.pdf

There are a good data about geometry and results so i decided to conduct simulation in SRFSimpleFoam.

what i have for 30 rad/sec and Re=15800 (3m/s at inlet)

Name:  rotChannelSigma30.jpg
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The coincidence is pretty good but not perfect. Data for 60 rad/sec is coming soon.
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salomeToOpenFOAM mesh conversion

Posted March 14, 2014 at 07:36 by skeptik (CFD notes)

I met one big problem when i have converted SALOME mesh by UNV format and ideasToFoam utility.

It was not usual mesh, it contained pyramids. See fig.

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I spent a lot time to achieve the same result like i can using ICEM. Only when i've found salomeToOpenFOAM script i successfully converted my mesh.

So i recommend it. The script is very helpful.

https://github.com/nicolasedh/salomeToOpenFOAM
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Useful LES tools in Fluent - Part 4

Posted March 7, 2014 at 03:59 by sbaffini (NuTBox)

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, 162 views)
File Type: pdf remap.pdf (24.2 KB, 174 views)
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Enosh, a structured grid generator (V)

Posted March 5, 2014 at 18:14 by lakeat (Daniel Wei's CFD Blog: (http://lakeat.co.nf/))

I have made significant improvement on the mesh export. The manual building up of OpenFOAM mesh now turns up really fast. I got a feeling that it could possibly beat even OpenFOAM's native blockMesh generator. In my test of a 3,200,000 mesh (for flow around a square cylinder). The building process took 90.51s in total. Here are more details:

...... [1] Done assembling the points. ( 7.09000s)
...... [2] Done assembling all cells & intnl cntrs. ( 40.62000s)
...
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