Reply To: Import cgns file to Harmonic Response

[Erik Kostson]

 

 

 

 

Hi

As I said you can not do what you want – sorry for repeating that is the bottom line. I know it is hard to understand the complex physics here.

Again the reason is that there is a lot of sound (acoustic waves inisde the fluid line) that is generated by the leakage as seen in the image below, and that leakage “sound” (not sure how you would calculate it with Fluent, but that is another question), consists of hydrodynamic acoustic sources, which would need to come in/be transfered into the acoustic FE mesh in harmonic acoustics, and so we can propagate them (acoustic sound sources due to leak) along the fluid (of course they will interact with the pipe wall also), and that can not be done as we can not obtain them (sound sources), and finally more importantly transfer those into harmonic acoustics (so there is no way of coupling these). DAVA is very different (imported cfd pressure) and as I said only for exterior flow problems like the side car window video we refer to for DAVA. 

See here and look on the slide (aeroacoustics – methods) with coupling (not possible to transfer to Ansys, but some other tools are mentioned were the coupling exists ). Also even if we could which we can not as you see there, it is only valid for aerodynamic acoustic sources (aeroacoustics), not hydroacoustics.

https://www.finiteelementanalysis.com.au/featured/take-your-acoustics-simulations-next-level-with-vrx-sound-rendering/

In anyway I will close this discussion with this explanation as it might be useful to others.

Of course this is my feedback and limitation here, but of course one can apply the imported cfd pressures and calculate something.

All the best

Erik