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transient solution de laval nozzle fluent

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Old   July 6, 2015, 18:18
Default transient solution de laval nozzle fluent
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Igor K
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Hello,

I am trying to see the time-dependent solution of a De Laval nozzle. I have a pressure inlet at 1 atm and a outlet at 10Pa, so it is basically an under-expanded nozzle. The idea is to see the gas jet formation and propagation into low pressure background gas. When I initialize the solution from the inlet it doesn't have a problem with convergence, but it is not what I like to see, as initially there is high pressure everywhere. When I initialize the solution from the outlet (which is what I want) the solution does not converge.

Does anyone have an idea on how to solve this problem? would dynamic mesh help?

Thanks in advance.
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