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.

Way to represent acoustic dissipation in time domain?

Please login with a confirmed email address before reporting spam

Hi,

I have a system which takes advantage of the inherient loss in the system. The simulation result is quite good in frequency domain. And the system inherient loss is modeled by assigning a complex sound speed in the material.

Now I want to check the propagation process in time domain. It seems that this technique does not work in time domain since I will get a very far off result after roughly 0.2 s by only changing the sound speed into the same complex number. If I change the sound speed back to a real number, the result converges but it's not desireable since the lack of dissipation in the system.

Now my question is, is there a similar trick in time domain to account for the dissipation in the system. There's no limit on the accuracy of the representation, i.e. as long as there's a consistent and predictable in the system, it's fine. Thanks in advance.

Best Regards, Zhang Ze


0 Replies Last Post 14.12.2018, 08:39 GMT-5
COMSOL Moderator

Hello Ze Zhang

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

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.