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help: using ODE to define porosity change with time

Posted 14 nov. 2016, 06:36 UTC−5 Modeling Tools & Definitions, Parameters, Variables, & Functions Version 5.2a 0 Replies

Yifei Zhang
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Hi everyone,

I'm a beginner in COMSOL and I have a very easy question.
The function I need to calculate is: dpore/dt=(1-pore)*(dz/dt), where pore is the target variable, z is the shrinkage rate in z direction.

I use domain ODE to calculate porosity change with time, what I input is :
f=(1-u)*(duz/dt).

I don't know how to define the shrinkage rate, so the error is that undefined variable duz.
Does anyone can help me with this problem? Thanks a lot!
0 Replies Last Post 14 nov. 2016, 06:36 UTC−5
COMSOL Moderator

Hello Yifei Zhang

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