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solve transcendental equation

Posted 14 giu 2011, 17:33 GMT-4 Version 4.1 1 Reply

Xiaoyi Yu
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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 giu 2011, 14:35 GMT-4
Lechoslaw Krolikowski
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Posted: 1 decade ago 15 giu 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.

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