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Conditions beyond the outlet

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Old   August 19, 2010, 08:06
Default Conditions beyond the outlet
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Mireia Ayop
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Good morning!

I'm simulating a simple duct to evaluate the propagation of pressure waves. The duct is cylindrical opened on one side (inlet where I introduce a given mass flow rate) and almost completelly closed at the one end if it were not for the fact that there is a small hole. This hole represent the outlet boundary condition in FLUENT.
Evaluating the pressure waves originated I can see that when the wave hits the end of the duct it is partially reflected and partially transmitted (through the small hole). The theory says that the portion that is reflected depends on the density conditions and speeds of sound at both sides of the hole (something similar to the reflection of a light wave in a lake).

Therefore I would like to know if FLUENT considers that the fluid beyond the outlet is air at what it calls 'reference values' or if it is capable of calculating the part of the pressure wave that is reflected without taking into account what it exists behind the outlet.

full of Xenon (I know the speed of sound
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