The General Form PDE Interfaces
The General Form PDE (g) interface (), found under the Mathematics>PDE Interfaces branch () when adding an interface, is a flexible way to specify PDEs in a general form.
When this interface is added, these default nodes are also added to the Model Builder: General Form PDE, Zero Flux, and Initial Values. Then, from the Physics toolbar, add other nodes that implement, for example, boundary conditions. You can also right-click General Form PDE to select features from the context menu.
The General Form PDE interface is also available in other forms from the PDE interfaces>Lower Dimensions submenu: General Form Boundary PDE (gb), General Form Edge PDE (ge), and General Form Point PDE (gp). Also see Modeling with PDEs on Boundaries, Edges, and Points.
The General Form PDE discusses the formulation and settings pertaining to the general form.
Settings
The Label is the default physics interface name.
The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.
The default Name (for the first General Form PDE interface in the model) is g (in domains), gb (on boundaries), ge (on edges), or gp (at points).