Learning Forum

[tabajabassel12]

I've designed a cylindrical chamber filled with water, sealed at both ends with elastic circular membranes. When an external force is applied to the outer surface of the membranes, they begin to vibrate, transferring these vibrations into the water. This setup allows us to measure both acoustic pressure and particle velocity within the water, providing valuable insights into how vibrations propagate in aquatic environments.

so what i should use FSI or modal+harmonic response+harmonic acoustic

and in fluent we don´t have inlet or outlet , just since the membrane vibrate transfer this vibration into water

[Erik Kostson]

Hi

 

Use harmonic acoustics module in Workbench (model there, both solid and water as it is fully coupled) - see here for a free course:

 

https://innovationspace.ansys.com/product/topics-in-acoustic-analysis/

 

 

All the best

 

Erik

[tabajabassel12]

thank you Erik,

in harmonic acoustic can i change the the type of membrane (elasticiy..) and i want for exemple to capture the acoustic wave at small size time (0.00001 s) ?

[Erik Kostson]

Hi

See the course I mentioned and go through as we said all the examples there.

So if you are looking into a frequency based harmonic analysis (so sinusoidal signals - so harmonic acoustic analysis), then use the harmonic acoustic system,

but if it is a general time load and time domain analysis (e.g., transient acoustics so pressure will be a function of time), then we need the coupled field transient to do transient acoustics.

Hope all this helps

Erik

[tabajabassel12]

 

Hey again,

thanks again,i have an issue that the chamber filled by water closed by the membranes how we can insure that the water is treated as incompressible flow, bc since i saw the deformation is the same from both surfaces and it should be less to the water surface since the warter is incompressible .

so how can i be sure that the water is treated as incompressible?

sorry to bother you man and thanks a lot