# Boundary conditions for the LRR model

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 May 9, 2006, 11:30 Hi! How do I define the bou #1 Member   Andreas Hauffe Join Date: Mar 2009 Location: Dresden, Germany Posts: 36 Rep Power: 10 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

October 16, 2013, 03:43
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 Originally Posted by andimb 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?

 November 1, 2013, 15:55 #3 New Member   Ben Graves Join Date: Dec 2012 Posts: 18 Rep Power: 7 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 skeptik and s.m like this.

November 4, 2013, 06:42
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 Originally Posted by bgraves 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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