Menu

Discussion Forum

New Discussion
Filter

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.

help: using ODE to define porosity change with time

Posted Nov 14, 2016, 6:36 a.m. EST Modeling Tools & Definitions, Parameters, Variables, & Functions Version 5.2a 0 Replies

Yifei Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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 Nov 14, 2016, 6:36 a.m. EST
COMSOL Moderator

Hello Yifei Zhang

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

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