Which Model?

jules

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.