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-   -   Boundary condition for supesonic nozzle simulation (http://www.cfd-online.com/Forums/fluent/47666-boundary-condition-supesonic-nozzle-simulation.html)

Abhinav Choudhari March 19, 2008 16:55

Boundary condition for supesonic nozzle simulation
 
Hi all, I am doing 3d simulation of convergence-divergence nozzle with supersonic flow. Mach no. around 2. I am using std K-e model. I would appreciate if someone can suggest me what would be the proper wall conditions for the nozzle. The average thickness of my nozzle is 0.1 inch. I went to couple of research paper, some have used adiabatic wall and some as constant temperature wall. Since this is supersonic flow simulation, I am not sure what to use as wall condition. I will really appreciate any suggestion on this. Thank you in advance. Abhinav

Hirdesh March 19, 2008 19:56

Re: Boundary condition for supesonic nozzle simula
 
Both wall conditions are right. A adiabatic wall can be maintained at constant temp.

Abhinav Choudhari March 19, 2008 20:28

Re: Boundary condition for supesonic nozzle simula
 
Hi Hirdesh, Thank for replying so quick. What you say adiabatic wall will be good or convective wall with specific heat transfer coefficient will be the good option for me. As flow is supersonic and mtl of nozzle is steel with 0.1 inch thickness.

Once again thank you very much for reply. Abhinav

Hirdesh March 19, 2008 21:53

Re: Boundary condition for supesonic nozzle simula
 
Hi, I think solid wall can't be convective. So better to take adiabatic wall.

Hirdesh

Ramesh. K March 26, 2008 04:31

Re: Boundary condition for supesonic nozzle simula
 
What exactly do u need at the wall are u planning to study the flow properties or the heat transfer across the wall. if your interest is only flow you can have only no slip condition at the wall and leave the default options of wall boundary condition as it is or if u need to study the heat transfer coefficient then u need to bother about it as maintaining the wall at constant temp or adiabatic

it entirely depends on ur problem definiton


Abhinav Choudhari March 28, 2008 15:06

Re: Boundary condition for supesonic nozzle simula
 
My main aim to analyze flow and in particular shock waves ... So I wanted to keep boundary condition simple still realistic ... What you suggest I should use as Boundary condition, as boundary condition is important for realistic results. Thank you.

zaw September 26, 2009 04:31

Dear Abhinav and all
I am also trying to simulate 3d CD nozzle flow. But I am very bad in grid generation. I use GAMBIT for grid generation. If you have any example of 3d CD nozzle grid generation and FLUENT simulation, help me please. I wonder if you make reply to me. my email is tunzawcn@gmail.com


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