CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Boundary conditions for the LRR model (http://www.cfd-online.com/Forums/openfoam-solving/60221-boundary-conditions-lrr-model.html)

 andimb May 9, 2006 11:30

Hi! How do I define the bou

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:
wall:

Thanks
Andreas

 s.m October 16, 2013 03:43

Quote:
 Originally Posted by andimb (Post 183422) 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?

 bgraves November 1, 2013 15:55

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

 s.m November 4, 2013 06:42

Quote:
 Originally Posted by bgraves (Post 460167) 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:)

 All times are GMT -4. The time now is 18:19.