# flow past a missle

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 September 6, 2007, 22:18 flow past a missle #1 xiaofish Guest   Posts: n/a 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

 September 7, 2007, 06:04 Re: flow past a missle #2 Joe Guest   Posts: n/a 10D sounds reasonable but compare it with a 20D case to be sure. Spalart almarmas is often used for external aerodynamics.

 September 9, 2007, 22:50 Re: flow past a missle: how to solve divergence? #3 xiaofish Guest   Posts: n/a 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.

 September 9, 2007, 22:51 flow past a missle: how to solve divergence? #4 xiaofish Guest   Posts: n/a 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.

 September 10, 2007, 11:44 Re: flow past a missle: how to solve divergence? #5 Joe Guest   Posts: n/a Do the tutorial dealing with external supersonic flow.

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