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A semi-analytical extension of the Reichardt wall law to pressure gradient effects

Posted April 17, 2015 at 07:40 by sbaffini (NuTBox)

I recently worked on wall functions, especially those based on simplified 1D numerical integration (e.g., http://link.springer.com/chapter/10....-642-14243-7_7) and i found a relatively simple, analytical, formulation that takes into account pressure gradient effects.

In practice, this is an extension of the Reichardt wall law to pressure gradient effects.

It is semi-analytical because it takes as assumption that the base Reichardt law is an exact solution of the...
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File Type: pdf wallf.pdf (36.5 KB, 205 views)
File Type: txt wallfn.txt (1.2 KB, 108 views)
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Ph.D. Thesis on LES

Posted May 1, 2014 at 12:24 by sbaffini (NuTBox)

I recently defended my thesis on Large Eddy Simulation, which is now available at:

http://hdl.handle.net/10589/89603

I won't spend too much words on promoting it, you can read the abstract for this. I just want to say it possibly provides a fresh view on the matter of implicit/explicit filtering, commutation errors and other evergreen topics in LES. As i put a specific effort on this, i also hope that it might work as a not too heavy introduction on LES in general. Finally,...
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y+ calculator for equilibrium flows

Posted April 10, 2014 at 03:58 by sbaffini (NuTBox)

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, 213 views)
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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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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, 283 views)
File Type: pdf remap.pdf (24.2 KB, 299 views)
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