|March 23, 2007, 11:58||
Segregated or Coupled? High Speed Flow Mixing.
I am simulating flow mixing in a tee joint for compressible gas, where the flow speeds varies from 0.1 to 0.8 Mach.
I tried both segregated and coupled solvers & got difference in results in the recirculation zones created after flow mixing. The pressure distribution downstream also give different contour plots.
1- Based on flow details, with which solver should i continue my simulations?
2- Other than fluent help files, does anyone has any other reference for the crieteria of selection of the solver?
thanks to all for the time and expected suggestions.
|March 29, 2007, 10:53||
Re: Segregated or Coupled? High Speed Flow Mixing.
Thanks alot for your reponse.
I am using fluent 6.2.16. The numerical scheme set up is summarized as:
Turbulence Model: K-epsilon realizable
Pressure Velocity Coupling: SIMPLEC
Skewness Correction: 0
All under relaxation factor 0.8 (pressure,density,body forces,momentum,turbulent KE, turbulent diss rate,energy)
Pressure ==> Standard
Density ==> First Order Upwind
Momentum ==> First Order Upwind
Turbulent KE ==> First Order Upwind
Turbulant Diss Rate ==> First Order Upwind
Energy ==> First Order Upwind
The grid is structured, aligned in flow direction.
For further information, when i ran these simulation they give satisfactory results till 0.4 Mach. BUT BEYOND THIS (0.5 - 0.8) THE SOLUTION DIVERGES IMMEDIATELY AS I SHIFT FROM INCOMPRESSIBLE TO COMPRESSIBLE.
Sorry for inconvinience in reading a lengthy message.
Thanks and Regards,
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