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I am trying to solve the 4th order biharmonic PDE with COMSOL. I'm new to COMSOL and I have been able to draw the necessary 2D geometry for the set up. However, I am having trouble inputting setting up the necessary equations.

I've been following this tutorial:

However, when I try the step on slide 9 of the tutorial to input the equation, the field just resets to the old value. I've been opening up other templates as well (such as the general coefficient in PDE modes) which are suppose to be for custom equations. However, it seems that these custom eqns are limited to second order PDEs, and I need to solve a 4th order PDE.

Any help on this would be much appreciated!

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