Hello,nI am a bit new to ansys. I have been learning it for about 3 weeks now approximately. My main interest lies in acoustic simulation and I would be very grateful for some guidance. I have some background DSP and in what is called physical modelling in sound synthesis, e.g
https://www.dsprelated.com/freebooks/pasp/nAs an experiment, I thought I would simulate a simple pipe/tube. Air flows across one of its openings with a specified velocity,v, and we can hear a tone (in my case a open pipe of 290mm length and 15 mm diameter. I calculate/expect and measure a first mode at ~600 Hz for open and ~300Hz for closed pipe).nIs there a possibility to simulate this behaviour in Fluent? I have tried many times but couldn't really see any resonances, not in simple pressure/velocity, and also not using acoustics models (I have manly tried Ffowcs-Williams & Hawkings, the Wave equation always gave floating point exceptions which I interpreted as divergence and the Broadband noise one seems to be the wrong choice for narrow band resonances/standing waves)nAm I approaching this in a wrong way? Should I rather try to measure broadband acoustic noise in CFD and then use the acoustics module in ansys mechanical (Harmonic Acoustics Module or modal Acoustics) to measure the response of the Air column in the pipe?nCan you provide any other guidance? I feel like I tried a lot and cannot get this air column to produce a standing wave from wind producing turbulence.nnTo state again: I have a specified wind speed, an open tube that should produce a standing wave and I am interested in the SPL, especially the response spectrum in db SPL. I wonder if I should stick to harmonic acoustics module, but i seems I should first measure the acoustic pressure generated by turbulence which should be coupled to the resonance of the air column..nSorry for the long and confused post, any pointers highly appreciated!nThank you very much! n n
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