Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

Modifying the Fluid Flow Equation System

Please login with a confirmed email address before reporting spam

Hi everybody,

Is it possible to change the fluid flow equation system in order to fit a logarithmic function in the derivative? I am currently using the earth science module to model a dual porosity fluid flow system. However, my numerical model requires me to have the derivative of a logarithmic function of pressure as opposed to just a pressure time dertivative. In other words I have

d(ln(p))/dt instead of d(p)/dt

where p is pressure and t is time. As far as I know, it is possible to change all terms of the equation system except for the derivative term. Any advice?

Thanks and Best Regards,

Andres Bracho.

0 Replies Last Post Feb 2, 2013, 4:00 a.m. EST
COMSOL Moderator

Hello Andres Bracho

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.