# Describing sources

## Introduction

For everything concerning the describing of the sources:

## Specificities connected with coupling

For a Steady State AC Magnetic / Transient Thermal coupling the power dissipated by Joule effect, resulting from the Steady State AC Magnetic solving process, is introduced as a heating source term in the Transient Thermal solving process.

From the software point of view, this transfer is carried out by means of conducting regions (of solid conductor type), as shown in the table below.

Name Thermal definition Magnetic definition Material
Thermal conducting region Region of solid conductor type
+ possible heating source
Heat computed by Joule effect in electromagnetic solving process

Attention: see particular condition if the surface impedance formulation in 3D is used (§ Remarks on the surface impedance formulation (3D))