Since version 2026, Flux 3D and Flux PEEC are no longer available.
Please use SimLab to create a new 3D project or to import an existing Flux 3D project.
Please use SimLab to create a new PEEC project (not possible to import an existing Flux PEEC project).
/!\ Documentation updates are in progress – some mentions of 3D may still appear.
Describing sources
Introduction
We distinguish three types of sources:
- an imposed value of heat sources (q0)
- an imposed value of heat flux density (φ0)
- an imposed value of temperature (T0)
The describing of these three types of sources in Flux software is detailed in the following blocks.
Imposed heat sources
It is possible to impose a density of heat sources (q0) on a region by: using the material regions of conducting type (as presented previously): the volume density of heat sources is then one of the data entered during the definition of the conducting region.
The power volume density of the heat sources is one of the input data during the definition of the conducting regions. The power volume density of the heat sources represents the q term in the thermal equations of steady state and transient thermal applications (see § Solved equation).
The power of a heat source is the volume integral of q over the volume of the
source ( 
).
The power volume density of the heat sources can be calculated with the electric conduction or magneto-harmonic applications (Joule losses).
Imposed temperature
It is possible to impose a value of temperature (T0) on a region by using the regions known as non-material of the type: imposed temperature
Imposed heat flux density
It is possible to impose a value of heat flux density (φ0) on a region by using the regions known as non-material of the type: heat exchange surface