Problem: Convergent- Divergent Nozzle Venting to Atmosphere

JohnPeclet · January 12, 2015, 07:57

Hi Everyone

This problem is regarding flow through a C-D nozzle. The geometry that is being used is in the attached image. The nozzle is usually given "Pressure Inlet" & "Pressure Outlet" boundary conditions. However, when considering a case where the nozzle flow is allowed to exit into an ambient fluid, what are the boundary conditions that might be required.

Could "Pressure far-field" be used in the external region. I have tried using it and am presented with quite a few errors.

Are there any alternatives that I have not tried yet?

Domain Image : http://i.imgur.com/CfW0tEX.jpg

ramidalf · January 12, 2015, 13:44

You have a a closed volume and there is air under pressure. So, zero pressure condition did not work? Basicly it is only condition you have, pressure = atmospheric pressure at the outlet.

ramidalf · January 13, 2015, 18:57

The set up itself looks very simple. If you want you can send it to me and I will run on my mashine.

January 12, 2015, 07:57	Problem: Convergent- Divergent Nozzle Venting to Atmosphere	#1
JohnPeclet New Member Join Date: Jan 2015 Posts: 2 Rep Power: 0	Hi Everyone This problem is regarding flow through a C-D nozzle. The geometry that is being used is in the attached image. The nozzle is usually given "Pressure Inlet" & "Pressure Outlet" boundary conditions. However, when considering a case where the nozzle flow is allowed to exit into an ambient fluid, what are the boundary conditions that might be required. Could "Pressure far-field" be used in the external region. I have tried using it and am presented with quite a few errors. Are there any alternatives that I have not tried yet? Domain Image : http://i.imgur.com/CfW0tEX.jpg

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rocket Nozzle problem	Jeremie	FLUENT	10	October 8, 2014 06:16
For Nozzle fluent problem	Jie	FLUENT	17	January 11, 2012 13:44
Convergent nozzle and preesure of steam	pranabjyoti	CFX	7	March 10, 2011 19:23
Nozzle flow problem	prabhu	CFX	2	March 10, 2007 07:38
Convergence Problem Supersonic Flow Laval Nozzle	Tobias	CFX	3	December 7, 2005 01:23

January 12, 2015, 13:44		#2
ramidalf New Member Rami Dalf Join Date: Jan 2015 Posts: 3 Rep Power: 11	You have a a closed volume and there is air under pressure. So, zero pressure condition did not work? Basicly it is only condition you have, pressure = atmospheric pressure at the outlet.

January 13, 2015, 18:57		#3
ramidalf New Member Rami Dalf Join Date: Jan 2015 Posts: 3 Rep Power: 11	The set up itself looks very simple. If you want you can send it to me and I will run on my mashine.