[rita]

I am trying to study the invinscid flow around a wing with 5,8 degress of angle of attack at Mach 0,118.
Unfortunatly no one on my college can help me with cfd, so I had to come here because I can not get less than e-2 on my residuals.
My max skewness is at 0,83.
I kept everything as default, but made these changes:

- invinscid
- ideal-gas
-energy equation on
-density based
-explicit
-node based
-operating pressure = 0
-farfield as "pressure farfield"
-gauge pressure = 101325
-at some point I switched to implict method with Courant = 20
- when residuals stopped to drop I inserted Courant = 5

I would like to know what is wrong and if e-3 is a good criterion of convergence (along with the monitoring of Cd e Cl values when they don't change).

I am getting negative Cd value. Why is it happening?

Thank you,
Ryvo Itail