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LES inflow Generator Rostock

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Old   December 31, 2013, 12:05
Default LES inflow Generator Rostock
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Bobi
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Dear Foamers

I am searching for inflow generator of Rostock for LES applying on O.F. 2.2.x. It seems that the old links are failed. Does anybody has an active link?

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Bobi
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Old   January 1, 2014, 09:04
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Hannes Kröger
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Hello Bobi,

Have a look at this link:

http://www.lemos.uni-rostock.de/downloads/cfd/

There are the LEMOS-extensions which contain the inflow generator.

Regards, Hannes
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Old   January 1, 2014, 12:57
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Bobi
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Dear Dr. Kroger

Many thanks for your valuable link. I hope that installing the mentioned valuable tools be straightforward.

Best Regards
Bobi
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Old   January 16, 2014, 21:51
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Dear Dr. Kroger,

One small question -

Can this LES inflow BC be used for compressible (high speed flows) cases as well. As far as I can understand - this BC requires U,L and R from a precursor simulation (could be RANS) to generate vortons (synthetic turbulence).

But in high speed flows we will also have Temperature fluctuations. What is your take on that? Maybe I can accommodate that using a fixed TotalTemperature BC, which will pick up velocity fluctuations to give me fluctuations in T static. Regarding Static pressure - need to think about it.

I have seen this BC being applied to combustion problems but there all the action happens close to the flame and the inlet is in a place where things are incompressible. Maybe thats not the case.

Any comments about all this?
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Old   January 17, 2014, 04:12
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Hannes Kröger
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Dear cfd.with.openfoam,

the inflow generator does not require a precursor simulation in general. Of course you need to have the distribution of L and R and the mean velocity from somewhere. But that doesn't need to be from a simulation, it could also be e.g. from a generic pipe or channel flow. You can even apply uniform values, if that makes any sense in your case.

The inflow generator has been developed for incompressible flows so far and deals only with the problem of generating a turbulent velocity field, not the associated pressure or velocity fluctuations.

So, as you already recognized: you can apply it, if you have a subsonic inflow in a compressible simulation. For really compressible turbulence, the method needs an extension.

Regards, Hannes
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Old   April 14, 2014, 06:08
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Paul Lynch
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Hi Hannes

Do you have any examples of specifying a non-uniform L and R field? I'm interested in modelling atmospheric boundary layer profiles, for which I could specify a function that approximates the integral length scale and turbulence intensity with height. Could this be done with groovyBC or similar?

Regards, Paul
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