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Floworks 2008 SP3.1 can't solve for a free surface between a gas and a liquid.
Thanks Rich, I suspected this might be the case.
I assume that the air is not intended to be in the device. If this is the case then it is likley that the vapour is due to caviation or that the volume of gas is artehr small and can probably be neglected. Flowroks will handle this situation to a degree. In any event while floworks can not handle a free surface problem as RB notes doesn't mean that it could not provide some significant insight into what is going on in your device. Flowroks is used quite a bit in cyclone separators which from your description sounds quite similar.