[VinayakDesh]

Dear All,

I am trying to perform a turbulent (k-epsilon) compressible flow simulation through a rocket engine nozzle with the following conditions:
Inlet P: 2 MPa, T: 900 K
Outlet: Vacuum

Here is my mesh and boundary region:
Inlet is : nozzle entry, and outlet is: the domain beyond the nozzle exit.

An image can be found here:
https://gyazo.com/bb7e493437eab39a5ae9f861f728be34

The turbulence model I use is k-epsilon, and the Operating condition is set to 0
Gauge Pressure at Inlet: 2 MPa, and outlet: 0 Pa

I am not sure why this solution seems to diverge, I think I am defining the boundary condition wrong. What must I do to fix this?

The mesh is pretty dense (4mm max size) - The nozzle outlet is 82 mm

I would appreciate if someone could shed some light on this error and help me fix this issue.

Kind Regards,

[VinayakDesh]

I have figured it out, thank you

[Incend1a]

Originally Posted by VinayakDesh

I have figured it out, thank you

hi
I have recently solve the resemble problem as you.
here is my case set
turbulence model: S-A
inletressure inlet 3Mpa,1000K
outletressure outlet 1.01KPa,300K
wall:idiabat wall
mesh is fine.
I am not sure why this solution seems to diverge,either
can you tell me how to do with it,thank you

Kind Regards

[Alessandro Z]

Hi can you please explain to us how did you solve the problem?

[AlexanderZ]

https://www.youtube.com/results?sear...le+simulation+