Equation Based Modeling in COMSOL Videos

Phil Kinnane | March 7, 2011
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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.

Adding a Global equation to a PDE in COMSOL Multiphysics, Accumulation of Heat example.

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Poisson’s Equation

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Natural Convection

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Comments

  1. Murilo Pessoa de Oliveira April 13, 2013 at 11:17 pm

    natural convection.mph – Where can I find this template to download?

    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?

  2. 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    Hi Murilo, the model here is a little out of date and probably wouldn’t be appropriate for the latest release.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

  3. 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

  4. 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.

  5. 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

  6. 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.

  7. Nishanth Mehanathan January 22, 2014 at 12:05 am

    Hi How can I include curl of a vector in the PDE …

  8. Hassanein Mobarek October 24, 2014 at 6:28 pm

    Hi,
    I have a question regarding to create my own PDE in COMSOL, I know that I have to use one of three templates available in COMSOL but still I don’t know how to transfer my high nonlinear equation into one of the equation templates.
    Could anyone please help
    Regards

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