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Segregated or Coupled? High Speed Flow Mixing.

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Old   March 23, 2007, 11:58
Default Segregated or Coupled? High Speed Flow Mixing.
  #1
Mazhar Azim
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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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Old   March 28, 2007, 17:04
Default Re: Segregated or Coupled? High Speed Flow Mixing.
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Seyed Farid Hosseinizadeh
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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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Old   March 29, 2007, 10:53
Default Re: Segregated or Coupled? High Speed Flow Mixing.
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Mazhar Azim
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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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