Supersonic nozzle jet

earlybird · May 13, 2015, 14:23

Hello,
I am trying to simulate a supersonic nozzle jet. the computational domain consists of a De Laval (CD) nozzle and a tubular chamber.
I don't have any problem in simulating the nozzle alone (except when I use mass-flow inlet) but when I try to simulate the whole domain (Nozzle+Chamber), it diverges.
I use a density-based solver, steady-state, implicit, Pressure inlet 210000 Pa, Temperature 6500 K. Pressure outlet 0. Operating pressure 101000 Pa. the gas is considered ideal gas.
could you please help if you have got the same experiences.

Regards

earlybird · May 14, 2015, 08:42

No one can help?

protocol · May 17, 2015, 14:28

I can help if you give details about your geometry
it depends on location of throat try changing to mass flow inlet

earlybird · May 20, 2015, 13:41

Hello Anand,
thanks for the reply.
I have already tried using mass flow inlet but it is worse! the only way to get the simulation to run is to set the inlet as the pressure inlet.
here is my geometry details. hope you can tell me what is wrong.

protocol · May 20, 2015, 14:13

your geometry details seems to be mising here if the flow is supersonic you can use pressure far field option and try and the boundary conditions needs to be checked i can help if you can provide me with proper details

May 13, 2015, 14:23	Supersonic nozzle jet	#1
earlybird New Member Join Date: Mar 2011 Posts: 13 Rep Power: 15	Hello, I am trying to simulate a supersonic nozzle jet. the computational domain consists of a De Laval (CD) nozzle and a tubular chamber. I don't have any problem in simulating the nozzle alone (except when I use mass-flow inlet) but when I try to simulate the whole domain (Nozzle+Chamber), it diverges. I use a density-based solver, steady-state, implicit, Pressure inlet 210000 Pa, Temperature 6500 K. Pressure outlet 0. Operating pressure 101000 Pa. the gas is considered ideal gas. could you please help if you have got the same experiences. Regards

May 20, 2015, 14:13	Geometry	#5
protocol New Member Join Date: Feb 2015 Posts: 26 Rep Power: 11	your geometry details seems to be mising here if the flow is supersonic you can use pressure far field option and try and the boundary conditions needs to be checked i can help if you can provide me with proper details

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Supersonic helium jet with sonicFoam	Intrepid	OpenFOAM Pre-Processing	7	May 1, 2019 22:04
Supersonic Nozzle Exhaust Simulation	mikeh	FLUENT	0	May 1, 2014 21:28
Jet in Supersonic Crossflow, controlling mass flow rate	ChrisA	OpenFOAM Running, Solving & CFD	3	November 13, 2012 18:20
C-D nozzle supersonic jet boundary	Gland	FLUENT	4	May 24, 2012 00:25
jet structure at the end of a 2D supersonic nozzle	N Menon	CFX	1	November 7, 2001 08:04

May 14, 2015, 08:42		#2
earlybird New Member Join Date: Mar 2011 Posts: 13 Rep Power: 15	No one can help?

May 17, 2015, 14:28		#3
protocol New Member Join Date: Feb 2015 Posts: 26 Rep Power: 11	I can help if you give details about your geometry it depends on location of throat try changing to mass flow inlet

May 20, 2015, 13:41		#4
earlybird New Member Join Date: Mar 2011 Posts: 13 Rep Power: 15	Hello Anand, thanks for the reply. I have already tried using mass flow inlet but it is worse! the only way to get the simulation to run is to set the inlet as the pressure inlet. here is my geometry details. hope you can tell me what is wrong.