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

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