Learning Forum

[ZX]

I have a question about the reflection of the default walls, can anyone please help me with it?

In the BCs of Fluent, the default walls are no-slip walls. Imagining an acoustic wave propagates in the water. When this  acoustic wave propagates to the interface of the water and the wall, does the wall 100% reflects the wave energy & without any wave refraction through the wall?

By countrast, in the real world, for the acoustic wave propagation in the water, when this wave meets a wall, there is wave refraction through the wall so the wall "absorbs" some energy of the acoustic wave.

In Fluent, if the default wall does reflect 100% acoustic wave, can anyone please tell me how should I set in Fluent to make the default wall "absorbs" some energy of the acoustic wave (I mean with refraction), like in the real world discussed above?

Thank you.

[Federico]

Hello, 

you can use an impedance boundary condition to have some of the energy of the wave transmitted through the boundary: 7.7. Boundary Acoustic Wave Models (ansys.com)