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-   -   flow past a missle (http://www.cfd-online.com/Forums/fluent/45956-flow-past-missle.html)

xiaofish September 6, 2007 22:18

flow past a missle
 
I am using Fluent to simulate flow past a missle. I want to know how far away for the outer boundary can be set as far-field pressure boudnary in supersonic flow past a missle.

Currently I set my outer boundary 10 times of the missile diameter. Is it enough? Thanks.

Also, could you kindly recommend a turbulent model for such a case? Thank you in advance.

Best Regards xiaofish

Joe September 7, 2007 06:04

Re: flow past a missle
 
10D sounds reasonable but compare it with a 20D case to be sure.

Spalart almarmas is often used for external aerodynamics.

xiaofish September 9, 2007 22:50

Re: flow past a missle: how to solve divergence?
 
Thank you very much for your reply.

I am now using Spalart almarmas + 2nd order upwind to do simulations in FLUENT. but it is very fast to diverge after just a few steps of iterations. My mach number is around 2 and Reynolds number in order of 105. So how to solve the divergence problem? How can i get some reasonable initiation field for the iterations to continue?

Thank you very much in advance.

xiaofish September 9, 2007 22:51

flow past a missle: how to solve divergence?
 
I am now using Spalart almarmas + 2nd order upwind to do simulations in FLUENT. but it is very fast to diverge after just a few steps of iterations. My mach number is around 2 and Reynolds number in order of 105. So how to solve the divergence problem? How can i get some reasonable initiation field for the iterations to continue?

Thank you very much in advance.

Joe September 10, 2007 11:44

Re: flow past a missle: how to solve divergence?
 
Do the tutorial dealing with external supersonic flow.


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