Coupling Acoustic-Structure

Please login with a confirmed email address before reporting spam

Hi,

I have modeled in solid mechanics a structure excited by a load and i would like to calculate the radiation in the air domain of a point located in the far field. I have used pressure acoustic boundary element to reduce the computational domain and coupled with acoustic-structure interaction. I only considering frequency domain. The problem is that the model is too computational expensive. I have tried to use axisymmetric symmetry but still the model is not able to converge. the structure is a wind turbine tower by the way.

I saw that i could actually split the problem in two part: first study the vibration of the structure in solid mechanics and afterward use the displacement from that as input in normal displacement boundary condition using boundary element method. But i do not get it.
Any advice or specific instruction.


3 Replies Last Post 09.01.2025, 11:17 GMT-5
Henrik Sönnerlind COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 2 days ago 09.01.2025, 04:26 GMT-5

Can you be more specific about what the problem is?

Do you have a problem with accessing the solution from the first study or is it a problem in writing the boundary condition for the acoustic problem?

If you create a small example, would you be able to do the same thing for FE based pressure acoustics?

-------------------
Henrik Sönnerlind
COMSOL
Can you be more specific about what the problem is? Do you have a problem with accessing the solution from the first study or is it a problem in writing the boundary condition for the acoustic problem? If you create a small example, would you be able to do the same thing for FE based pressure acoustics?

Acculution ApS Certified Consultant

Please login with a confirmed email address before reporting spam

Posted: 2 days ago 09.01.2025, 09:08 GMT-5

You may want to look into a segregated solver setup a la https://doc.comsol.com/5.4/doc/com.comsol.help.aco/aco_ug_acousticstructure.06.33.html

But if you cannot get convergence with 2Daxi, there may be some underlying problem that needs handling before you concern yourself with solver optimization. Get the model going with a rough mesh and build confidence from there.

-------------------
René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
You may want to look into a segregated solver setup a la https://doc.comsol.com/5.4/doc/com.comsol.help.aco/aco_ug_acousticstructure.06.33.html But if you cannot get convergence with 2Daxi, there may be some underlying problem that needs handling before you concern yourself with solver optimization. Get the model going with a rough mesh and build confidence from there.

Jeff Hiller COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 2 days ago 09.01.2025, 11:17 GMT-5

Filipo,

Can you describe what the real world (3D) problem looks like (geometry, loads, etc)? I have trouble figuring out how a 2D axisymmetry assumption is possible.

Jeff

-------------------
Jeff Hiller
Filipo, Can you describe what the real world (3D) problem looks like (geometry, loads, etc)? I have trouble figuring out how a 2D axisymmetry assumption is possible. Jeff

Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.