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September 16, 2021, 01:20 |
Unclear points in using "libAcoustics"
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#1 | |
New Member
Kosuke Seto
Join Date: Jan 2020
Posts: 10
Rep Power: 6 |
Hi, Foamers.
I'm trying to use libAcoustics to calculate sound from fan. I can get some result by using the library, but some unclear points remain, so I hope I could get any helpful information. ① What are "patches" "surfaces"? When I try to use the library in type of "Curle", entry "patches" is required and I think this is the surface where pressure is integrated. Then, what is the entry "surfaces" in type of "Ffowcs~"? ② What is the entry "fixedResponseDelay" "responseDelay"? I think this is related to "retarded time" of aeroacoustics. And I think when the entry "fixedResponseDelay" is true, "responseDelay" is needed. So, what happens when "fixedResponseDelay" is false? Retarded time is set to each surface? And how is the "responseDelay" used? Is the data from "responseDelay" ago used to calculate the sound pressure for all observers? ③ When this library is used in postProcess, the time of result is strange like this. Quote:
I'm sorry to make many questions once, but any little information would be helpful. Kosuke |
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September 22, 2021, 06:22 |
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#2 |
Member
Join Date: Nov 2011
Posts: 32
Rep Power: 14 |
Dear Kosuke,
You can find the answers to your questions in the Issues section at GitHub: https://github.com/unicfdlab/libAcou...s?q=is%3Aissue 1. If you use the Curle analogy the patch is required, for the FWH - surfaces section. 2. See Issues 48 and 50: https://github.com/unicfdlab/libAcoustics/issues/50 https://github.com/unicfdlab/libAcoustics/issues/48 3. It is a strange result. What OpenFOAM version did you use? Please use the latest version of the library for v2012. If this problem will appear, please use the issue form on Github for the report. |
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September 23, 2021, 02:24 |
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#3 |
New Member
Kosuke Seto
Join Date: Jan 2020
Posts: 10
Rep Power: 6 |
Dear Andy,
Thank you for your information! I'll check the issue section! |
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libacoustics curle fw-h |
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