Modeling Porous Media Flow

Please login with a confirmed email address before reporting spam


I am currently trying to model flow through the extracellular matrix, but in the beginning stages of my simulation, I have run into errors in modeling flow through a gel.

If I run a stationary simulation of a rectangular prism where one side is an inlet and the other is an outlet with a porosity of 0.99, I receive the error "Failed to find a solution, maximum number of Newton iterations reached, returned solution is not converged, not all parameter steps returned.” As far as I know, the lack of error estimate convergence indicates that time dependent geometry and parameters have been run in a stationary study, and the model interprets the geometry/parameters as yielding a time-dependent flow. Is this correct? Currently I am trying to model an ideal fluid, so the fluid should not be time-dependent. Is there any way to change this?

If I run a time-dependent simulation of the porous medium cube, the velocity graphic reports that there is only movement of the liquid on the inlet and outlet sides. I have attached a screenshot of a version of this, with a cylindrical cutout yielding the same errors. Would anyone be able to help me resolve this problem?

Thank you.

0 Replies Last Post Aug 17, 2022, 11:02 a.m. EDT
COMSOL Moderator

Hello Aparna Deokar

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.


Please read the discussion forum rules before posting.

Please log in to post a reply.

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.