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Imposing a fluctuating BC at the outlet

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Old   December 8, 2022, 06:31
Default Imposing a fluctuating BC at the outlet
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Hey, maybe someone can explain me that. I am investigating a cascade flow in a turbine with very high pressure fluctuations. At the inlet domain I have a unsteady boundary condition.Now I am looking for a boundary condition for my outlet. I don't quite understand the following: I have a certain outlet area, i.e. the distance from the blade to the outlet. I extend this outlet range for example by 2 times. Then I start a simulation with a fixed boundary condition at the new outlet. If the flow now passes the first outlet but has not yet reached the second outlet, I extract the time-dependent condition there during the simulation and this extracted condition is then my outlet boundary condition at the desired location in the simulations.

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