CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

MacCormack Method for Axisymmetric Nozzle

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

LinkBack Thread Tools Display Modes
Old   November 13, 2012, 19:25
Question MacCormack Method for Axisymmetric Nozzle
New Member
Luis Eduardo
Join Date: Jan 2011
Posts: 2
Rep Power: 0
lebc is on a distinguished road
Good Night everyone,

I'm having some trouble with my graduation project,it is about nozzles.

The aim is to make a code using Finite Differences MacCormack's method for both quasi-1D and axisymmetric nozzle(first whitout shock,and after with shock).

The quasi-1D solution worked very well,but i can't make the axisymmetric case work fine,at some point of the simulation something weird happens at the inlet boundary,and the solution blows up.

I've noticed that there is a sudden pressure drop just in the first row of cells after the inlet,and this happens with density and temperature either,no matter what I change... The pressure is reduced to 10% of the inlet value in large times. I think the problem is this,but maybe there are other things.

The most weird part is: the Mach number seems to be correct,and the velocity profiles too!

Does anyone know how to avoid this pressure drop??? The code can be downloaded in the link below! Also, there are some results of the simulation using p=10^7 Pa and T=2000K. I'm using Matlab R2011a.

Sorry about the long post and if it was somehow confusing,because there are a lot of details to give.
I can give my email if someone wants to help me!

Best Regards,

Link to download:
lebc is offline   Reply With Quote

Old   November 17, 2012, 18:39
New Member
Luis Eduardo
Join Date: Jan 2011
Posts: 2
Rep Power: 0
lebc is on a distinguished road
lebc is offline   Reply With Quote


axisymmetric, finite differences, maccormack, nozzle

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
compressible flow in a counterflow nozzle d.vamsidhar FLUENT 0 November 24, 2005 02:45
Maccormack method Student Main CFD Forum 1 January 9, 2005 23:46
MacCormack Method Nick Main CFD Forum 2 September 17, 2004 06:58
1-D nozzle flow equations using MacCormack method Jim Main CFD Forum 0 January 21, 2004 17:20
Solutions of Nozzle Flows by MacCormack Technique worasit Main CFD Forum 5 September 29, 2003 11:38

All times are GMT -4. The time now is 14:22.