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 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).