Model inputs is a special type of parameter in physics features or physics properties where you can choose from a list of announced variables (typically field quantities such as temperature, concentration, or electric field, where vector fields have three components). Model inputs can also be used as an input to a Property Group under a material to represent, for example, a temperature-dependent material property. If the property group specifies that it supports one or more model inputs, any physics feature that uses the group’s material will display those model input lists in the Model Inputs section of the physics node’s Settings window. Any physical quantity in COMSOL Multiphysics can be used as a model input.

Model inputs are always available as default model inputs. See Default Model Inputs in the COMSOL Multiphysics Reference Manual.

All physical quantities that can act as model inputs declare and define common variables that are always available (for example, minput.T for the temperature T).