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Old   March 8, 2007, 10:46
Default Which Model?
  #1
jules
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Hello,Im modeling a 2D NACA65A210 airfoil using GAMBIT and FLUENT....

My flow speed is subsonic, Mach 0.6 @0ft. I was wondering as experts on CFD your opinions on how i would go about selecting the best model. I have tried a number of variations, however i'm not sure what the 'official' model is for my conditions. Various sources tell me various models.

i.e:

1) As my flow is subsonic, what should my vicous model be?

2) Should the energy equation be on or off?

3) Should my solver be coupled or segregated?

4) What discretization should i use (i.e pressure presto!?, momentum 2nd or 1st order?

I hope you can help me out! Cheers, Julian.
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Old   March 8, 2007, 11:31
Default Re: Which Model?
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ag
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Turbulent, viscous, coupled, with energy equation (the physics demand it) turned on.
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Old   March 8, 2007, 11:48
Default Re: Which Model?
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jules
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Thanks mate. Thats what my research was pointing to but i was unsure. I think im going to go with a k-epsilon viscous model.

As you can probably tell im new to CFD, and i'm learning it blind, with my only help being a CFD textbook, an aerodynamics textbook, and this forum- so help is much appreciated!

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Old   March 9, 2007, 07:17
Default Re: Which Model?
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jules
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Ok and at risk of looking like an idiot, for the discretization scheme, for flow, Turbulance Kinetic Energy, and Dissipation Rate, should i use 1st order upwind or 2nd order upwind?

Cheers in advance. J
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Old   March 9, 2007, 11:55
Default Re: Which Model?
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ag
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I would use the second-order upwind.
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Old   March 11, 2007, 02:28
Default Re: Which Model?
  #6
sa
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what is your application type. subsonic aircraft or supersonic aircraft
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Old   March 11, 2007, 18:59
Default Re: Which Model?
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jules
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subsonic. Ive sorted a model now, thanks to you all (ag, and sa) for help!
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