LamBremhorst turbulent model

J0bouchard · March 2, 2011, 16:13

Hi,

i'm testing OpenFoam with the simple Restivo case. Can't get the Low-Reynolds LamBremhorst model to converge. Epsilon always gets infinite and nut to zero. Works ok with Launder-Sharma model.

Also, Mesh is fine enough for a LRN model.

Any advice? Experiences with the LamBremhorst model?

Thanks

nikesh · February 21, 2013, 08:43

Hii Jo,
Any chance you managed to solve this problem?? I too am encountering this problem at the moment.
Any help you could pass on??
I am implementing simpleFOAM to run a simple 2D flatplate case. I am stuck with assigning the boundary condition for epsilon at the wall.
Would be really great if you can help!!
Thnks
Nikesh

J0bouchard · February 21, 2013, 09:11

Hi Nikesh,

The only way I could get the LRN LB model to converge is with a very dense mesh near the boundaries. This is equivalent to a direct resolution of the Navier-Stokes equations, no LRN models involved.

After multiple tests, I came to the conclusion that the LB model code is not working right, impossible to duplicate any results found in references.
Instead of using the LB model, I used a 2 layer LRN model (Xu-Chen) for my applications.

Sorry I could not be of more help.
Have a nice day.

nikesh · February 21, 2013, 09:28

Thnx Jo.
I shall try that out too. Lets see how it goes!!

March 2, 2011, 16:13	LamBremhorst turbulent model	#1
J0bouchard New Member Jo Bouchard Join Date: Mar 2011 Location: Qc Canada Posts: 2 Rep Power: 0	Hi, i'm testing OpenFoam with the simple Restivo case. Can't get the Low-Reynolds LamBremhorst model to converge. Epsilon always gets infinite and nut to zero. Works ok with Launder-Sharma model. Also, Mesh is fine enough for a LRN model. Any advice? Experiences with the LamBremhorst model? Thanks

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February 21, 2013, 08:43		#2
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	Hii Jo, Any chance you managed to solve this problem?? I too am encountering this problem at the moment. Any help you could pass on?? I am implementing simpleFOAM to run a simple 2D flatplate case. I am stuck with assigning the boundary condition for epsilon at the wall. Would be really great if you can help!! Thnks Nikesh

February 21, 2013, 09:11		#3
J0bouchard New Member Jo Bouchard Join Date: Mar 2011 Location: Qc Canada Posts: 2 Rep Power: 0	Hi Nikesh, The only way I could get the LRN LB model to converge is with a very dense mesh near the boundaries. This is equivalent to a direct resolution of the Navier-Stokes equations, no LRN models involved. After multiple tests, I came to the conclusion that the LB model code is not working right, impossible to duplicate any results found in references. Instead of using the LB model, I used a 2 layer LRN model (Xu-Chen) for my applications. Sorry I could not be of more help. Have a nice day.

February 21, 2013, 09:28		#4
nikesh Member Nikesh Bhattarai Join Date: Nov 2011 Location: Sacheon, South Korea Posts: 82 Rep Power: 13	Thnx Jo. I shall try that out too. Lets see how it goes!!