|February 3, 2011, 10:53||
Help on bc on external tab on numeca the value k-epsilon
Join Date: Jan 2011
Posts: 4Rep Power: 7
I have a problem on mumeca
i dont know what parameter i have to put on boundaries for the values k and epislon
i use Turbulent Navier-Stokes , Shear Stress Transport (SST) , for an airfoil
on the tab parameters for boundaries i need to put values for k and epsilon (on external tab)
(i have found the values for the other parameters (density,pressure,...))
Thank you a lot
|February 8, 2011, 08:04||
Join Date: Nov 2009
Posts: 199Rep Power: 10
I depends the physics of the flow. usually turbulent kinetic energy (k) is roughly stated as a fraction of mean flow kinetic energy. for example, in case of an axial turbine k will be estimated as 5 to 20% of mean flow kinetic energy. for the case of epsilon one way is to use turbulent length scale. if inlet flow turbulent length scale is known, you can find epsilon from it.
in case there is no data, you should make some try and error.
i would like to know what type of analysis you are going to perfom in Numeca? if you are to perfom a simple aerodynamic simulation, inlet turbulent characteristics perhaps has a few effect on your results. but if are to simulate a heat transfer analysis (or Conjugate Heat Transfer) "k" and "epsilon" should be carefully specified.
|Thread||Thread Starter||Forum||Replies||Last Post|
|SimpleFoam k and epsilon bounded||nedved||OpenFOAM Running, Solving & CFD||15||Yesterday 03:40|
|CGNS Compiling||Diego||Main CFD Forum||17||December 21, 2014 02:40|
|Compressible epsilon blows up||swahono||OpenFOAM||10||November 26, 2010 06:38|
|SimpleFoam k and epsilon bounded||nedved||OpenFOAM Running, Solving & CFD||1||November 25, 2008 21:21|
|New NUMECA Forum Opened||Jonas Larsson||Main CFD Forum||0||February 16, 2003 11:25|