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## Main Question or Discussion Point

I am currently modeling the altitude that a water rocket can attain. In order to do this i am first modeling the the thrust phase.

Due to the water mass decreasing with time (the same goes for the pressure - it decreases over time as the water is expelled out of the nozzle).

This is an unsteady drainage problem in which the bottle is filled with water and pressurized to around 6 Bar. I cannot use Bernoulli's equation as this only describes a steady flow process. The same applies for Torricelli's v = sqrt(2gh).

Does anyone know how i go about modeling this unsteady flow problem?

Due to the water mass decreasing with time (the same goes for the pressure - it decreases over time as the water is expelled out of the nozzle).

This is an unsteady drainage problem in which the bottle is filled with water and pressurized to around 6 Bar. I cannot use Bernoulli's equation as this only describes a steady flow process. The same applies for Torricelli's v = sqrt(2gh).

Does anyone know how i go about modeling this unsteady flow problem?