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having trouble modelling basic convergent water nozzle flow |
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January 31, 2015, 15:59 |
having trouble modelling basic convergent water nozzle flow
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#1 |
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Olli
Join Date: Jan 2015
Posts: 1
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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 |
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January 14, 2016, 16:37 |
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#2 |
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I'd just replace the inlet with a mass-flow inlet, and monitor the pressure at the inlet, and then increase/decrease mass-flow rate until desired inlet pressure is achieved.
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