Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

Wave equation 1D

Please login with a confirmed email address before reporting spam

Hello,

I'm actually using Comsol 4.3 to solve the wave equation 1D (PDE (waeq)) with the form :
e*d2u/dt2 + grad(-C*grad(u)) = f.
I put : e is the mass density and C is the elastic constant, to define the acoustic speed in this wire. Then I send a cosine wave from left to right. The right end is free.

But it is very strange that there is a supplement signal which goes with a double speed. In addition, the wavelength of this signal is in the order of the mesh.

Could you give me some advices ?

Thank you very much in advance.

Anne

0 Replies Last Post 2013年9月16日 GMT-4 05:22
COMSOL Moderator

Hello Anne Nghiem

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.