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 The information provided may be out of date.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.
Mass matrix is Zero
Posted 21.07.2016, 13:55 GMT-4 Acoustics & Vibrations, LiveLink for MATLAB Version 4.4 0 Replies
Please login with a confirmed email address before reporting spam
I have built a model using pressure acoustic frequency domain module. I have tried to extract state space matrices using MATLAB Livelink. The problem is my mass matrix turns to null matrix. As I have read in the other discussions the problem could be related to the type of boundary conditions. My model is a simple cylindrical tube, I have specified pressure boundary condition to the inlet, sound soft boundary to the outlet and the others are sound hard boundary.
It will be great if someone gives me some hints that how can I solve my problem.
Kind regards,
Shahin Mohammadnejad
Hello shahin mohammadnejad
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.