COMSOL Blog

Equation Based Modeling in COMSOL Videos

Core Functionality | Posted on March 7th, 2011 by

COMSOL Multiphysics offers direct access to mathematical models utilized in its interfaces and allows users to customize their own theoretical model within COMSOL with unparalleled ease. Here are three video tutorials on how users can add their own Partial Differential Equations (PDEs) within the COMSOL Multiphysics interface.

Poisson’s Equation

Full Resolution Video

Natural Convection

Full Resolution Video

Murilo Pessoa de Oliveira

April 13, 2013 at 11:17 pm

I would like to replace the fluid and include the AIR but also consider the effects of thermal radiation in the annular space, How to do this?

Phil Kinnane

April 16, 2013 at 1:35 pm

Hi Murilo, the model here is a little out of date and probably wouldn’t be appropriate for the latest release. Also, it would be very difficult to include the radiation physics using the underlying equations. This is instead supported by the Heat Transfer Module

Amin Parvizi

October 2, 2013 at 9:23 am

Greetings,

As a matter of fact, I have two Poisson equations with two different source term ( D^2 =f1 and D^2=f2 , D^2 is Laplacian) in 2D and , I do not know what is the boundary condition. Would it possible to use the equation based modeling in Comsol to solve this kind of equations?

Best Regards

Phil Kinnane

October 7, 2013 at 10:51 am

Hi Amin,
Yes, of course you do need to know the boundary conditions, but once you figure that out, you certainly can solve two coupled Poisson equations in COMSOL.

Nor Syamimi

October 11, 2013 at 4:01 am

hi, i am currently doing on solid mechanics model..i’m having trouble to calculate the line length of my model before and after deformation to calculate the object elongation. I am an beginner in comsol..

mimi

Ozgur Taner

October 21, 2013 at 4:59 pm

Is it possible to edit one of the coefficients as a second PDE’s dependent variable? For instance, changing ‘alpha’ in coefficient form as ‘u2′. In this case, does Comsol apply the nabla operator to both of the variables, or it only considers alpha as a coefficient (which will be the value of u2 in this case)? Thanks in advance.