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Boundary conditions for the LRR model

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Old   May 9, 2006, 11:30
Default Hi! How do I define the bou
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Andreas Hauffe
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Hi!

How do I define the boundary conditions for the LRR turbulence model at an inlet, an outlet and a wall?

Is this right?
inlet:
R_ii = 2/3*k
R_ij = 0 i<>j
outlet:
zero gradient
wall:
zero gradient

Thanks
Andreas
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Old   October 16, 2013, 03:43
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s.m
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saeideh mohamadi
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Quote:
Originally Posted by andimb View Post
Hi!

How do I define the boundary conditions for the LRR turbulence model at an inlet, an outlet and a wall?

Is this right?
inlet:
R_ii = 2/3*k
R_ij = 0 i<>j
outlet:
zero gradient
wall:
zero gradient

Thanks
Andreas
Hi Andreas
i am simulatinf the flow over an airfoil, i use simpleFoam and LRR turbulence model, but my simulation with this model diverged, i don't know why!
did you understand How to define the boundary conditions for the LRR turbulence model at inlet &outlet &wall?
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Old   November 1, 2013, 15:55
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Ben Graves
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Hi S.M

if your simulation is diverging, what you can try is to run k-epsilon for 1000 iterations, then run the R command in terminal. Then go to RAS properties and change k-epsilon to LRR.

At the wall with a wall resolved grid the Reynolds stress tensor should be zero. At the inlet I use fixedValue and zeroGradient at the outlet.

Hope this helps,
-Ben
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Old   November 4, 2013, 06:42
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s.m
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saeideh mohamadi
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Quote:
Originally Posted by bgraves View Post
Hi S.M

if your simulation is diverging, what you can try is to run k-epsilon for 1000 iterations, then run the R command in terminal. Then go to RAS properties and change k-epsilon to LRR.

At the wall with a wall resolved grid the Reynolds stress tensor should be zero. At the inlet I use fixedValue and zeroGradient at the outlet.

Hope this helps,
-Ben
Ok, i 'll do it Ben.
Thank you very much
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