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Transient simulation (Problem with massflow and Pressure) |
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August 22, 2011, 09:58 |
Transient simulation (Problem with massflow and Pressure)
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New Member
Christian F
Join Date: Mar 2011
Posts: 8
Rep Power: 15 |
Hello everybody,
i am simulating a rotary piston engine. The Simulation is working but the problem is the following: At the beginning the pressure inside of the cylinder is 0 bar (reference pressure is 1 bar). At the inlet the pressure is 3 bar. While the piston is moving, air is flowing from the intlet in the cylinder and the pressure rises. When the pressure in the cylinder is reaching the 3 bars (The maximum pressure) the pressure an massflow increase from the inlet into the cylinder should go down, but i am reaching even 3.5 bars until the massflow goes down. As you can see in the diagram the pressure for a certain time step is not changing anymore after some iteration steps. So i am only reaching the 3 bars after some timesteps (which is of course different to the reality). In a steady state analysis for a certain Piston positon i am reaching the 3 bars after about 30 iteration steps. So what do i have to do to get the simulation closer to the reality? Thanks. |
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