July 12, 2018 at 2:01 pmCT27Subscriber
I am working on a project involving several (thousands) of acoustic monopoles for which I am trying to find the sound propagating into an acoustic cavity inside a structure. I have been using the AWAVE command to insert acoustic monopoles into the simulation. However, Ansys only allows Wavenum to be between 1 and 20, so it seems I can only run 20 acoustic sources per simulation. Is there a way in Ansys to insert more than 20 acoustic sources in each simulation? Currently, the only option seems to be to run 20 sources at a time and superimpose the results. However, I have thousands of sources and would like to simulate at about 50 frequencies, so this would significantly increase the computation time. Any advice would be appreciated.
I am using harmonic response with the Ansys ACT extension for Ansys 17.0.
Thank you for your help.
July 12, 2018 at 2:28 pmsk_cheahSubscriber
Not sure if it applies to you...
If you have a limited number of listening nodes, you could take advantage of reciprocity by artificially putting a unit monopole at the listening location and measure the response at the thousands of 'dead' monopoles. You have to then scale the measured response at the 'dead' monopoles to calculate what you desire.
July 16, 2018 at 1:35 pmCT27Subscriber
Thank you for your response. That is very helpful since I do have a limited number of listening nodes. I've performed some simulations to test the reciprocity (swapping the source and receiver locations). As expected, I got perfect reciprocity when no structure was included in the simulation. However, when I included structural coupling I did not see reciprocity in my results (Acoustic pressure at the receiver location was different when the source and receiver location was swapped). Is reciprocity only true in the case without structural coupling? I will continue to review my simulation setup to see if perhaps that is where I made a mistake.
July 16, 2018 at 2:41 pm
July 16, 2018 at 2:45 pmCT27Subscriber
Thanks, I will investigate and test this and report back how it goes.
July 26, 2018 at 7:07 pmCT27Subscriber
From my testing, it seems reciprocity is only an option for the case without structural coupling. Once the structure is introduced into the problem, reciprocity is not perfect for a source outside the structure and a listening node inside an internal cavity. Thank you for the advice though. This may be useful in a future project.
It would be helpful if there is a way to insert more than 20 acoustic monopoles at a time in a simulation. It seems that the only limitation is the Wavenum. Is it arbitrary that this has to be between 1 and 20? If so, is there a workaround or an upgrade to Ansys that allows for more sources in one simulation?
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