CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Nozzle - Simulation converges, but data incorrect

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   July 20, 2009, 05:13
Default Nozzle - Simulation converges, but data incorrect
New Member
Join Date: Jul 2009
Posts: 2
Rep Power: 0
fade is on a distinguished road

I'm running a simulation on a laval converging-diverging nozzle, and while the answer is converging, the values are lower than what Fluent gave (a program I don't currently have access to, which is why I am using CFX, which I am less familiar with), or what experiments show. The problem is set using the energy equation, with a pressure inlet and supersonic outlet. The residuals are good, and the flow profile makes sense, but the velocities are about 20% low.
Because of the high pressure (~40 atm), I started with lower pressures and a subsonic outlet, and built up the speed slowly. In searching results, most people seem to have trouble with convergence, which I did not, but if anyone has any idea why the values are unusual, they would be much appreciated.

fade is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need assistance in BC's for simulation of Vacuum cleaning nozzle bruce OpenFOAM Running, Solving & CFD 0 May 22, 2009 14:56
Data on Converging-Diverging Nozzle; Mohammad Main CFD Forum 0 September 6, 2002 00:55
Ventilation Simulation & Experiment Data Luo Shengping Main CFD Forum 2 November 29, 2000 11:29
Turbine flow simulation data Mohan Varma Main CFD Forum 3 October 18, 1999 10:27
3-D Contaminant Dispersal Simulation Apple L S Chan Main CFD Forum 1 December 23, 1998 11:06

All times are GMT -4. The time now is 07:29.