# Concept of physical application

## Concept of physical application

A physical application allows the solving of a problem described by an equation, the operating hypothesis and the boundary conditions.

The concept of physical application regroups information that concerns:

- the solved equation and the solving mode of this equation (model, formulations, approximations, …)
- the operating hypotheses: characteristics of the material media and the material behavior, characteristics of the sources, …
- the boundary conditions: infinite box, conditions of symmetries and/or periodicity, other conditions imposed by the user, …

## Categories of applications

The basic applications can be grouped into three categories:

- magnetic applications
- thermal applications
- electrical applications

To these, the strong coupling between magnetic or electric with thermal application are added:

- magneto-thermal application
- electrothermal applications

## General operation

The previously defined applications can be classified according to the field states:

- static applications treat static (or steady state) phenomena in devices where the field sources are time independent
- transient applications treat variables or transient phenomena in devices where the field sources are time dependent
- steady state AC applications for devices where the time variation of the field sources is sinusoidal

## Circuit coupling / kinematic coupling

Flux permits the user to carry out studies with circuit coupling and kinematic coupling.

- Circuit coupling: The circuit coupling introduces the electrical equations directly into the magnetic field computation, enabling the analysis of electric conductors and the supply circuit. We refer to field – circuit coupling (or coupling with circuit equations).

- Kinematics coupling: The Flux kinematic module enables the study of a moving part in a device subject to mechanical forces (springs, friction, gravity, etc.) and magnetic forces (magnets, coils, ...).