ANSYS CFX Acoustic reflectivity, documentation

hand90 · July 21, 2020, 09:58

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.

ghorrocks · July 21, 2020, 19:45

Good question, you should ask ANSYS support that question.

Bananenflanke · July 22, 2020, 05:24

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!

hand90 · July 23, 2020, 06:19

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.

July 21, 2020, 09:58	ANSYS CFX Acoustic reflectivity, documentation	#1
hand90 Member Thomas Join Date: Nov 2017 Posts: 37 Rep Power: 9	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.

July 21, 2020, 19:45		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Good question, you should ask ANSYS support that question. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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July 22, 2020, 05:24		#3
Bananenflanke New Member Jannis Join Date: Jul 2020 Posts: 20 Rep Power: 6	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!

July 23, 2020, 06:19		#4
hand90 Member Thomas Join Date: Nov 2017 Posts: 37 Rep Power: 9	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.