CFD Simulation of a Rocket Engine Nozzle: Divergence Issue (Want to see nozzle plume)

VinayakDesh · May 12, 2017, 15:25

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 · May 12, 2017, 16:46

I have figured it out, thank you

Incend1a · February 28, 2018, 22:07

Quote:

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
inlet

ressure inlet 3Mpa,1000K
outlet

ressure 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 · February 1, 2022, 06:24

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

AlexanderZ · February 2, 2022, 21:57

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

May 12, 2017, 15:25	CFD Simulation of a Rocket Engine Nozzle: Divergence Issue (Want to see nozzle plume)	#1
VinayakDesh New Member Vinayak Deshpande Join Date: May 2017 Location: Canada Posts: 3 Rep Power: 9	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, Last edited by VinayakDesh; May 15, 2017 at 12:18.

May 12, 2017, 16:46	Dear admin, please close this thread	#2
VinayakDesh New Member Vinayak Deshpande Join Date: May 2017 Location: Canada Posts: 3 Rep Power: 9	I have figured it out, thank you

February 2, 2022, 21:57		#5
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	https://www.youtube.com/results?sear...le+simulation+ __________________ best regards ****************************** press LIKE if this message was helpful

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February 1, 2022, 06:24		#4
Alessandro Z New Member Alessandro Join Date: Nov 2018 Posts: 5 Rep Power: 8	Hi can you please explain to us how did you solve the problem?