COMSOL 6.4 - Updating Model Settings

Updating Model Settings

The COMSOL model object allows you to modify parameters, features, or feature properties, using the set method. Once a property value is updated, you can run the appropriate sequence, depending on where the changes were introduced into the model — for example, in the geometry or the mesh sequence. Running the solver sequence automatically runs all sequences where modified settings are detected.

Starting with the busbar model described in A Thorough Example: The Busbar, this section modifies a parameter value and re-solves the model. For this purpose, the geometry of the model is prepared using parameters such as L for the length of the busbar, and tbb for the thickness of the busbar.

1

Start COMSOL with MATLAB (if you have not done so already).

2

Load the model from the COMSOL application library:

3

Plot the current solution:

mphplot(model,'pg4');

4

Change the parameter L (length of the busbar):

mphsetparam(model,'L','18[cm]');

5

Run the solver sequence and compute the new solution:

mphrun(model,'study');

The solver node automatically detects all modifications in the model, and runs the geometry or mesh sequences when needed. The new value for the parameter L induces a change in the geometry, requiring a new mesh. Full associativity is also ensured, making sure that all physics settings remain applied as in the original model.

6

Plot the new solution with the updated geometry:

mphplot(model,'pg4');

Code for Use with MATLAB®

mphplot(model,'pg4');

mphsetparam(model,'L','18[cm]');

mphrun(model,'study');

mphplot(model,'pg4');