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Particle dispersion model with LES?

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Old   October 28, 2010, 21:17
Default Particle dispersion model with LES?
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Kushagra Mittal
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Hi,

Is there any dispersion model available for particle tracking with LES in Openfoam ? I found three models in openfoam:

1) StochasticDispersionRAS
2) none
3) GradientDispersionRAS

First and last option can not be used with LES and gives error as they seem to be based on RANS turbulence modeling?

Can some one please comment and guide me?

Many thanks,
Kushagra
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Old   October 29, 2010, 13:13
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matej forman
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Hi,
as you write the only dispersion model available for LES is none, which probably does not do what you want. The question is: Do you need a dispersion model for your LES simulation? What is the Stokes number of your particles, what is your particle time scale compared to the timescale of unresolved turbulence?

If you really need it, it should not be difficult to write your own following the RAS model as a template and some LES dispersion model from the literature.

btw. there is a dummy LES dispersion implementation in spray class of dieselSpray.

good luck

matej
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Old   October 29, 2010, 16:50
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Kushagra Mittal
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Dear Matej,
Thank you very much for your help.
I will look in to details you pointed out and get back to you.
Thanks once again,
Regards,
Kushagra
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