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csmistry August 28, 2009 03:30

Convergent divergent nozzle
 
3 Attachment(s)
Dear sir,

I am doind analysis of CD nozzle. with simple example with variation of pressures to study flow behaviour inside. also want to capture shock in it.. i took pressure 1 bar at inlet ,0.54 at outlet(critical pressure ratio). i am not getting convergence and after some convergence i am getting mass flow rate parameter along the center portion of geometry...

Weather my BC are wrong or my understading is wrong please guide me.

The CCL file,Mesh,convergence plot i am attaching here

ckleanth August 28, 2009 04:26

well maybe the simulation is transient? :rolleyes:

have you read the faq and especialy the section for convergence?

csmistry August 28, 2009 05:27

reply
 
no man please refer CCL>TXT ... analysis is steadystate

ckleanth August 28, 2009 05:48

i know you setup the simulation as a steady state.. but is it? ;)

ghorrocks August 28, 2009 06:33

It may be transient but there are a lot of other things to check first. This question has been asked millions of times so here's my best guide as to how to proceed.
http://www.cfd-online.com/Wiki/Ansys...gence_criteria

kingjewel1 August 29, 2009 11:06

How do you know that's not a converged solution given your conditions?
What are your criteria?

Mehul157@yahoo.com September 16, 2009 01:40

Hi Mistry,

I think you will not get better convegence than you have achieved. It may be becuase you problem can be bestly described by LES.

Regards
Mehul


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