# Boundary Conditions RANS rhopisofoam

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 August 2, 2010, 06:24 Boundary Conditions RANS rhopisofoam #1 New Member   Join Date: Jul 2010 Posts: 4 Rep Power: 9 Dear CFD friends, I am very new to OpenFoam. I would like to initialize alphat, epsilon, k mut, omega and R for rhopisofoam RANS. Could someone help me please?, Thank you very much.

 August 22, 2010, 08:13 #2 Senior Member   Nilesh Rane Join Date: Apr 2010 Posts: 122 Rep Power: 9 Can you please post details about your case and what kinda help you need?? i mean in calculating or setting up or whatever.. __________________ Imagination is more important than knowledge..

 August 22, 2010, 13:46 #3 New Member   Join Date: Jul 2010 Posts: 4 Rep Power: 9 Dear CFD friend, I have a duct ( inlet, outlet, walls) and the velocity at the inlet is 10 m/s and the pressure at the outlet is 0. If you need more information I can tell you more. Thank you very much.

 August 22, 2010, 15:18 #4 Senior Member   Nilesh Rane Join Date: Apr 2010 Posts: 122 Rep Power: 9 Well, i am also not very much sure about this, as i am also facing same problems, but would like to tell you what i know. It might help you nevertheless. alphat =turbulent thermal diffusivity R= Reynolds stress tensor eps = turbulent dissipation rate omega = specific turbulent dissipation rate k = turbulent kinetic energy I think the variables you need to specify depend upon the turbulence model you use. Say you are using k-eps model then you will need to specify k and epsilon and alphat. And in case you need to calculate the actual values for the parameters, you can use the formulas used widely. See following link: http://jullio.pe.kr/fluent6.1/help/html/ug/node178.htm I dont know about specifying values for alphat and R. Hope this helps. just got some more info :-) Please see this post, you will get more info: http://www.cfd-online.com/Forums/openfoam-solving/79323-solver-subsonic-compressible-turbulent-flow-1-7-a.html#post272288 __________________ Imagination is more important than knowledge.. Last edited by nileshjrane; August 22, 2010 at 15:22. Reason: just got some more info :-)

 August 22, 2010, 16:34 #5 New Member   Join Date: Jul 2010 Posts: 4 Rep Power: 9 Thank you very much !!!.

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