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October 26, 2010, 13:15 
RNGkepsilon with realisable contraint

#1 
Senior Member
Claus Meister
Join Date: Aug 2009
Location: Wiesbaden, Germany
Posts: 241
Rep Power: 9 
Hello Foamers!
Does anybody know if the RNGke model has a realisable constraint? If not, then I am wondering if it even need one, i.e. are there a other properties which makes the need for readability redundant? Cheers in advance 

October 27, 2010, 11:04 

#2  
Senior Member
Vesselin Krastev
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 364
Rep Power: 11 
Quote:
 P. A. Durbin, "On the ke stagnation point anomaly", Int. J. Heat and Fluid Flow 17: 8990, 1996.  TsanHsing Shih et al., "A new ke eddy viscosity model for high Reynolds number turbulent flows", Computers Fluids Vol 24, No 3, pp 227238, 1995.  C. G. Speziale and S. Thangam, "Analysis of an RNG turbulence model for separated flows", Int. J. Engng Sci. Vol 30, No 10, pp 13791388, 1992.  V. Yakhot et al., "Development of turbulence models for shear flows by a double expansion technique", Phys. Fluids A 4 (7), July 1992. Regards V. 

October 27, 2010, 12:16 

#3 
Senior Member
Claus Meister
Join Date: Aug 2009
Location: Wiesbaden, Germany
Posts: 241
Rep Power: 9 
The thing is, that I need to know if it is better to have a realizable constraint in the RNG model or not. Because, I computed a simulation which aborted due to a stagnation point. I changed to realisableKE to pass the critical point. Afterward, I changed back to RNG and the simulation went through. This is not a nice solution, but i worked. Therefore, I am interesting to implement the realizable constraint in RNG model.


October 27, 2010, 12:31 

#4  
Senior Member
Vesselin Krastev
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 364
Rep Power: 11 
Quote:
Regards V. 

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