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Segregated or Coupled? High Speed Flow Mixing. |
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March 23, 2007, 11:58 |
Segregated or Coupled? High Speed Flow Mixing.
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#1 |
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Dear all,
Situation: 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. Question: 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. Regards Mazhar. |
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March 28, 2007, 18:04 |
Re: Segregated or Coupled? High Speed Flow Mixing.
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#2 |
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Hey: Can I see what is your numerical method's name? Maybe I can do some help. Thanks/Farid
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March 29, 2007, 11:53 |
Re: Segregated or Coupled? High Speed Flow Mixing.
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#3 |
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Thanks alot for your reponse.
I am using fluent 6.2.16. The numerical scheme set up is summarized as: Solver: segregated 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) Descretization Schemes: 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, Mazhar. |
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