[MrSingh]

Hello everybody,
I am running a simulation on a 2D hemispherical blunt body on sonicFoam which has a total length of 1 m.
The initial conditions are:
U = 2339.26 m/s
P = 101325 Pa
T = 300 K
mu = 0.011965
Other thermal properties like Cv are of standard air.
The top wall is supersonicFreestream and bottom wall is symmetryPlane

I am validating a experimental data but I am not able to calculate correct drag coefficient value. It is coming around 0.2 where it should be around 0.85.
Maybe I defined the libforces wrong in the controlDict directory or there might be issue in setting up the simulation? Please somebody guide me as I have limited time.

Files link: https://drive.google.com/file/d/1HSL...ew?usp=sharing

[Yann]

Hello,

Where does you Aref value come from?
Since OpenFOAM use pseudo-2D, you need to take into account the actual thickness of your mesh in the 3rd direction to set your Aref value and have the proper force coefficients.

Hope this helps,
Yann

[MrSingh]

Thank you Yann.