Large Eddy Simulation

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Rouaissi Ridha

Rouaissi Ridha

April 25, 2013 11:22am UTC

Large Eddy Simulation

hello
I want to use Large Eddy Simulation on comsol but I can't found it.
Can you help how to do this.

thanks a lot

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Ivar Kjelberg

Ivar Kjelberg

April 25, 2013 12:13pm UTC in response to Rouaissi Ridha

Re: Large Eddy Simulation

Hi

I'm not sure there are an "Large" Eddy current, but try out the MEF physics and the related model library cases

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Good luck
Ivar

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Jens Krause

Jens Krause

April 25, 2013 1:55pm UTC in response to Ivar Kjelberg

Re: Large Eddy Simulation

Hi,

I think the question is about fluid dynamics. Large eddy simulation is somkething
like "direct numerical simulation" where the plain Navier-Stokes equations are solved
in turbulent regime and the eddies are resolved in space and time. In contrast
to ke-model.

Usually done in dedicated solvers, so I dont know if this can be done in Comsol.

Regards

Jens

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Ivar Kjelberg

Ivar Kjelberg

April 26, 2013 5:52am UTC in response to Jens Krause

Re: Large Eddy Simulation

Hi

sorry I misunderstood as there are different Eddy currents around ;)
For that one I'm not competent enough, have you tried to ask COMSOL directly ?

--
Good luck
Ivar

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Steve Conrad

Steve Conrad

May 16, 2013 3:22am UTC in response to Ivar Kjelberg

Re: Large Eddy Simulation

COMSOL does not have an LES study type at this time. To approximate this type of simulation in COMSOL, one can use a combination of NS equations on a fine mesh, a transient solver with small time steps (small CFL number), superimposed small random inlet variation (and perhaps asymmetry in the mesh) and time-averaging of results.

--
Steven Conrad, MD PhD
LSU Health

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Xinhui Zhou

Xinhui Zhou

May 28, 2013 3:44pm UTC in response to Steve Conrad

Re: Large Eddy Simulation

Dear Steven,

Do you have any example model to demonstrate this ? If yes, can you share it with us ? Thanks a lot. I am trying to run some simulation which requires LES turbulence model, but COMSOL does not have it.

Best,

Xinhui,.

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liu meng jie

liu meng jie

September 18, 2014 3:23am UTC in response to Steve Conrad

Re: Large Eddy Simulation

Hi
Dear Steve Conrad, you say :"COMSOL does not have an LES study type at this time". I want to know what's your meaning about "LES study type"? you know comsol using the RANS . So, can we create a LES model using it‘s equations interface or through physical Model Builder?

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Regards

Meng Jie

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