Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
acoustic-structure interaction using form assembly
Posted 13 apr 2019, 10:35 GMT-4 Acoustics & Vibrations, Geometry Version 5.4 1 Reply
Please login with a confirmed email address before reporting spam
Hi In my model, the structure domain is immersed in a air domain. Usaually we will use form union at the end of the geometry. But for some reason, I need to use form assembly at the end to modify the boundary condition of the structure domain.
Does anyone know how can I do the acoustic-structure interaction with form assembly?
Please login with a confirmed email address before reporting spam
Hi,
There is no built-in such coupling. You can however set it up manually. What you need is
- A pressure load on the structural side
- A normal accceleration on the acoustics side
- Extrusion coupling operators moving the variables from one side to another.
In order to see how to set up the loads, you can take a look at
https://www.comsol.com/model/vibrations-of-a-disk-backed-by-an-air-filled-cylinder-188
One of the variants there uses a manual coupling, so you can see which nodes to use. However, you cannot just pick up the variables as in the example, since they live on different boundaries. You have to type them in yourself, using expressions like genext1(acpr.pt). Look in Equation View for the Acoustic-Structure Boundary multiphysics coupling to find the names of the appropriate variables.
Regards,
Henrik
Henrik Sönnerlind
COMSOL