Compressible Pipe Flow
 

Hello dear friends,

I am a newbie in StarCCM+ and trying to simulate an air pipe flow. My input is mass flow rate, like a normal pipe flow. In my simulation I am trying to see the heat transfer.

The pressure of the air is around 10 bars. Therefore, I am not sure which models to use.

I tried:
-steady
-3d
-gas
-segregated flow
-ideal gas
-segregated fluid temp.
-turbulent -k-epsilon

however my solution did not converge.

Could you guys suggest me any physics models if you have any experience ?

Kind regards,

What does your mesh look like? Also, what are you defining convergence as?

Hello,

Mesh is like the following. I used:
Generalized cylinder, exturuder, prism layer(2 layerS) polyhedrad mesher and surface remesher.

I estimated a y+, but could not check it.

Convergence problem i defined as : divergence at the second step(floating point problem it says)

Thanks for the reply btw

Make sure you are setting your reference pressure to 10 bar and the outlet to 0.