Testing the Schrodinger Equation Interface
At any time during the implementation of a physics interface using the Physics Builder, you can launch an updated preview of the physics interface so that you can add feature nodes and check that the contents and behavior of the associated Settings windows and other functionality is as expected. To do so, select the main node for the physics interface implementation (for example, Schrodinger Equation) and then click the Show Preview button () in the Settings window toolbar, or press F8. An instance of the physics interface then appears at the bottom of the Physics Builder tree.
When you are finished, update COMSOL Multiphysics to check that the Schrodinger Equation interface appears in the Model Wizard and that the functionality and settings appear as expected.
1
From the Windows menu or the Home toolbar, click Physics Builder Manager ().
2
Under Archive Browser, right-click the Development Files node () and select Add Builder File. Browse to locate SchrodingerEquation.mphphb, select it, and click Open.
3
From File menu select New ().
4
Click Model Wizard ().
5
Select any space dimension except 0D.
6
On the Select Physics page, under Mathematics > Quantum Mechanics select Schrodinger Equation (scheq). Click Add.
7
Click Study ().
8
On the Select Study page, verify that Eigenvalue is the only available study type under General Studies. Select it and click Done ().
9
In the Model Builder, verify that the default nodes appear as expected and that their Settings windows contain the user inputs that you specified. Also right-click the Schrodinger Equation node to add the Wave Function Value boundary condition, which is not available by default.
10
Proceed by building an example model (see Example Model — Hydrogen Atom) to verify that the Schrodinger Equation interface solves the correct equation using the correct boundary conditions and that you can plot the probability density function as a predefined expression.
11
Correct any errors or problems that you find and save the physics interface again.
When you have successfully created a first instance of a physics interface you can consider improvements or additions for future development. Typically you can save a model file and then reload it after updating the physics definitions to see how it behaves after applying some extensions or corrections.
The Physics Builder Manager