# Thermal¶

Type: enum Cylindrical, Fixed, Flux, Radiating -/- optional

This parameter fixes the type of boundary conditions for thermal simulation projects.

The following boundary types are allowed:

• Fixed: Fixes the temperature at the boundary by specifying by specifying a temperature field.

• Radiating: Implements a Stefan-Boltzmann radiation condition,

where is the thermal conductivity (c.f. ThermalConductivity), is the emissivity of the surface (c.f. aacb71fb2c81b906a2b16cd3a4e974c5), is the Stefan-Boltzmann constant, and is the temperature of the surrounding heat reservoir.

The Stefan-Boltzmann law depends non-linearly from the temperature It is used in the linearized form,

when used for the linear heat equation.