Menu

Discussion Forum

New Discussion
Filtern

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 The information provided may be out of date.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.

solve transcendental equation

Posted 14.06.2011, 17:33 GMT-4 Version 4.1 1 Reply

Xiaoyi Yu
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

I tried to solve the transcendental equation (see attachment 1), but got an error (see below). Can anybody help me to solve it ? Thank you! The comsol file was also attached

error:

undefined value found.
- Detail: Undefined value found in the equation residual vector.
There are 1 degrees of freedom giving NaN/Inf in the vector for the variable mod1.u

Attachments:

1 Reply Last Post 15.06.2011, 14:35 GMT-4
Lechoslaw Krolikowski
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 15.06.2011, 14:35 GMT-4
You use initial value u_0 = 0 (on subnode Global Equations). For this value denominators in your formula are equal 0. Try u_0 > 0, say 0.1.
You use initial value u_0 = 0 (on subnode Global Equations). For this value denominators in your formula are equal 0. Try u_0 > 0, say 0.1.

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