CFD Online Logo CFD Online URL
Home > Forums > FLUENT

help - Running Converging Diverging Nozzle with a shock wave

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

LinkBack Thread Tools Display Modes
Old   September 3, 2012, 08:23
Red face help - Running Converging Diverging Nozzle with a shock wave
New Member
Join Date: Aug 2012
Posts: 9
Rep Power: 5
Daco is on a distinguished road

I have recently started to work with fluent using the tutorial in the link:

They solved the nozzle problem for the case the flow is supersonic in all the nozzle with no shocks. I have succeeded to recapture their results.

Next I tried (independently) to solve the same geometry with a higher outlet static pressure to get (theoretically) a shock wave in the diverging section of the nozzle.

The total pressure at the inlet is atmospheric (101325 Pascal).
I tried to input several outlet pressure: 20,000 Pa, 30,000 Pa and such
and after running the program the solution didn't converge and I didn't get any good results (the residuals went up instead of down)

My question is, What could be the cause for this divergence?

As I said, theoretically, A shock wave should occur.
Does it require any special attention? setup settings or meshing.. etc.

Could it be that the divergence occurs due to a too coarse mesh?
(I was told that the mesh in the tutorial is quite coarse)

Thanks ahead ,

Daco is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
about local bump shock wave drag reduction fxzf Main CFD Forum 5 February 26, 2010 13:04
Shock Wave usker STAR-CD 8 July 8, 2009 13:22
Shock in nozzle - dangerous? Christian Main CFD Forum 1 May 8, 2006 12:48
Shock Capturing in a Con-Di Nozzle. Meriem Allouache Main CFD Forum 3 December 27, 2004 06:49
Shock wave in Nozzle Mohammad Main CFD Forum 0 May 16, 2002 11:33

All times are GMT -4. The time now is 23:25.