[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

[s.m]

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?

[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

[s.m]

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

[joshwilliams]

Originally Posted by bgraves

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.

Is this correct? I do not think the streamwise-wall-normal component (R_xy) should be zero at the wall...