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ANSYS CFX Acoustic reflectivity, documentation

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Old   July 21, 2020, 09:58
Default ANSYS CFX Acoustic reflectivity, documentation
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Thomas
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Hi everyone,

I am wondering if anyone knows what nonreflective boundary condition has been implemented in ANSYS CFX. As it is a beta feature it seems as there is no documentation, not even who developed the boundary condition. Any guidance would be greatly appreciated.
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Old   July 21, 2020, 19:45
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Glenn Horrocks
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Good question, you should ask ANSYS support that question.
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Old   July 22, 2020, 05:24
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Hi Thomas,

I am also interested in the non-reflective boundary conditions due to a current project. So far I found out that there are two different non-reflective boundary conditions in CFX: one for inlets, outlets and openings and one especially for openings (absorbing layer). Furthermore I found a thesis in which the first boundary condition was described and used. According to this thesis the boundary condition is based on a work by Poinsot and Lele and there is a validation report by Zwart and Abshoff. I hope this helps you. I would also appreciate any further information.

thesis:
Computation of the Thermoacoustic Driving Capability of Rocket Engine Flames with Detailed Chemistry by Attila Lehel Török (found at google scholar)

paper:
Boundary Conditions for Direct Simulations of Compressible Viscous Flows by Poinsot and Lele (found at google scholar)

Validation report:
Non-reflective Boundary Conditions in CFX-5 by Zwart and Abshoff

Greetings!
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Old   July 23, 2020, 06:19
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Thank you for the response so far!

I am currently trying to get in contact with Ansys support but I have to go through the University which makes it a bit of a complicated process. Hence I asked here but if I get an answer I will post it.

The literature mentioned is great for the mean time. Unfortunately it seems as the Ansys validation report is not publicly available.
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