Problematic time derivative in a differential equation

Numerical methods and mathematical models of Elmer
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Takala
Posts: 186
Joined: 23 Aug 2009, 23:59

Problematic time derivative in a differential equation

Post by Takala »

Hi all,

I have a problematic time derivative. The field variable that normally is operated only by the the time derivative is now divided first by the norm of the variable. Am I able to deal with this in Elmer or should I some how try to get rid of the norm? See the attached picture.

Cheers,

Eelis
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