[Numpy-discussion] Some help on matlab to numpy translation

Nicolas Rougier Nicolas.Rougier at loria.fr
Mon Mar 15 17:58:46 EDT 2010

Thanks and in fact, I already wasted quite some time on and your last version will help me a lot. Unfortunately, I'm not a specialist at lattice Boltzmann methods at all so I'm not able to answer your questions (my initial idea was to convert the matlab script to be have a running example to get some starting point). Also, I found today some computers in the lab to test the matlab version and it seems to run as advertised on the site. I  now need to run both versions side by side and to check where are the differences. I will post sources as soon as I get it to run properly.

Thanks again.


On Mar 15, 2010, at 22:32 , Friedrich Romstedt wrote:

> Ok, so I send yet another version.  Maybe Bruce is right, but I didn't
> care, because we have fret enough.  Now it not only computes
> something, but also displays something :-(
> Nicolas, maybe you can now waste some of your time with it?  I was
> curious, both to understand and to get it working, but I failed.  I
> doubt especially the section "Microscopic boundary conditions",
> because commenting it out makes things, well, say worser.  Leaving the
> other sections out is also not recommendable, but at least not that
> destructive.  I do not understand why in the microscopic boundary
> section only directions 6 and 7 come into play and not 3.  Also I do
> not understand why they occur in *all* output direction expressions.
> Furthermore, the fluid, albeit behaving also at the inlet quite
> strange, bounces back the outlet ...
> I disabled the obstacle so far, and plotted the 4 direction
> (downwards), and the resulting ux and uy flows.
> I give up so far.
> Friedrich
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