Menu

Discussion Forum

New Discussion
Filter

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.

How to convert a wave equation with second-order time derivative into its weak form

Posted Mar 22, 2010, 9:31 a.m. EDT 0 Replies

Wei Liu
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi, everybody:

I have a problem and wish to get help from you.

When I studied the example "a Vibrating Membrane" in the Model Library of Femlab 3.1, I wanted to convert the equation d^2u/dt^2-(uxx+uyy)=0 into the weak form. But in this equation there is a second-order time derivative, it means a problem to me and I ONLY can deal with fisrt-order time derivative.

So anybody can give me some suggestions or tell me how to convert it?


Great thanks.


0 Replies Last Post Mar 22, 2010, 9:31 a.m. EDT
COMSOL Moderator

Hello Wei Liu

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.

Suggested Content