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modeling gas expansion

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Old   June 19, 2010, 01:04
Question modeling gas expansion
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hi, this is the first time I use FLUENT because I need to simulate a gas jet coming out of a very small nozzle into vacuum. e.g. the density profile or pressure distribution (not the flow inside the nozzle). Assuming I know the mass flow rate at the nozzle tip.

It seems to be a not so tricky problem but I just can't make the correct boundary conditions or models to get convergence or physical results.

Can anyone please help and give me some suggestions? I'll be very appreciative.
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