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COMSOL, PDE

Hi

Has any body used comsol pde. please guide me through the basics of comsol methods.

 

Cheers

 

Nadeem

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Temesgen Markos's picture

Hi nadeem,

The Comsol documentation explains how to do equation based modeling. If you read the "Equation-Based Models" chapter of the 'Model Library' manual together with the "PDE modes for equation-based modeling" chapter of the 'Modeling Guide' manual, you will have some idea. Probably the manuals are not that clear.

 
The basic procedure is to find the coefficients of the general PDE model so that it reduces to the equation you want to solve. Do the same thing with your boundary and initial conditions.

If you want to work through the examples in the documentation (I use comsol 3.3),  I would suggest you work on the Telegraph equation which I personally find easier to understant. Then go for the Kdv or Shallow water equation. The order in the manual is not really in increasing order of difficulty.

If you post the particular equation you want to work with, some one over here might give you a solution.

 

Cheers,

Temesgen 

Hi all,
I am trying to solve a nonlinear PDE in 3D using comsol. My problem equations are of
the form

div (S*X^2*del(Y)) = w*dX/dz (X is the variable)
Edel^2(w) + delE*delw = dp/dz (w is the variable)

 where w is the velocity in z direction
 S- Sqrt((wx^2) + (wy^2))
 E- depends on X
 Y- is ln(S*X*E)

 I am trying to use general form but I am unable to get  a form such that I can form both gamma vector and the source term, f. I am new to PDE modes in comsol  and I wonder if anyone can help me with any suggestions. Thank you for the help.

 --K

 

Temesgen Markos's picture

What is p? If it is independent, you may need one more equation. Also what are your boundary conditions? If I were you, I would choose a different symbol for X and Y - it makes reading your problem easier; first I confused them with the independent variables x and y.

Have you sorted out problem yet?

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