[derhamp]

Hi,

Not sure if this is the right place to ask but will explain my issues in case it can be passed onto someone that can help.

I am trying to model a basic convergent water rocket nozzle, however my simulation results are very poor in comparison to manual calculations.

I have created what I believe to be a working mesh and have set the inlet and outlet to be outlet pressure points. I have set the inlet pressure to be 20 bar and the outlet to atmospheric. Is this right? The inlet pressure will decrease with time, however I am unsure how to do this.

Other things I require are the fluid velocity, thrust/ mass flow rate (which can then be used to calculate force?), the pressure and discharge coefficient.

I am quite new to Star so apologies if this seems trivial.

Thanks,

Olli