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.

Error: Void equations

Posted Apr 19, 2012, 5:09 a.m. EDT Low-Frequency Electromagnetics, Microfluidics 0 Replies

Junren Sia
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi all,

I solved for laminar flow and electric potential in a microfluidic channel, and wanted to see how charged spherical particles injected into the channel would flow.

So I compute a stationary solution for laminar flow and electric potential, then try to compute time dependent solution for particle trajectory.

However, I got this error message:

"Failed to find consistent initial values.
Singular matrix.

There are 37489 void equations (empty rows in matrix) for the variable mod1.V.

There are 37484 degrees of freedom that do not occur in any equation (empty columns in matrix) for the variable mod1.V.
Last time step is not converged."

Could anyone advise please?

I have attached the model file.

Thanks,
Jaren

Attachments:

0 Replies Last Post Apr 19, 2012, 5:09 a.m. EDT
COMSOL Moderator

Hello Junren Sia

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