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İntroducing a derivative function to 'f' in Coefficient From PDE

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Hello everyone

İ want to implement an equation but i couldnt find a way to do it the equation is in the file attachment..

D is a constant
rho is water vapor density and the thing i want it to calculate


ive tried coefficient form from mathematics>PDE interfaces>Coefficient form
if i use coefficient form i have to introduce the first section of the equation to 'f' but i do not know how to introduce a derivative function to f (i do not how to write it)

And the other thing is that sigma there is a function changes with time as well but when i learn how to introduce it to the function ill just write it to parameters as a function of time(t) so i think it wont be a problem



0 Replies Last Post Aug 4, 2015, 12:19 p.m. EDT
COMSOL Moderator

Hello Hakan Tarık Meriç

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