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Old   September 6, 2007, 22:18
Default flow past a missle
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xiaofish
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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
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Old   September 7, 2007, 06:04
Default Re: flow past a missle
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Joe
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10D sounds reasonable but compare it with a 20D case to be sure.

Spalart almarmas is often used for external aerodynamics.
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Old   September 9, 2007, 22:50
Default Re: flow past a missle: how to solve divergence?
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xiaofish
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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.
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Old   September 9, 2007, 22:51
Default flow past a missle: how to solve divergence?
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xiaofish
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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.
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Old   September 10, 2007, 11:44
Default Re: flow past a missle: how to solve divergence?
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Joe
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Do the tutorial dealing with external supersonic flow.
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