Describing material media

Introduction

The material media are modeled by material regions :

  • mainly volume regions in 3D problems; surface regions and line regions are also possible in 3D
  • mainly surface regions in 2D problems; line regions and point regions are also possible in 2D

For additional information about the role of regions, see chapter Physics: principles.

Material regions: overview

Volume, surface or line material regions allow the modeling of the material media (with materials). The physical properties of the medium are those of the corresponding material region.

A region… enables the modeling…
Magneto Static/ Transient Magnetic air or vacuum

of the air or of the vacuum

(permeability μ r =1)

(hard material or

soft material)
magnetic non conducting

of a medium:

magnetic (permeability μ r )

non-conducting
coil conductor1

of a medium:

conducting with source1

non-magnetic (permeability μ r =1)

→ this medium represents a coil:
  • constituted of a number of turns
  • passed through by a current J s
laminated magnetic non conducting2

of a laminated medium:

magnetic (permeability μr)

non conducting

→

this medium represents a stacked magnetic sheets2 :
  • planes (2D plan / 3D) ou cylindriques (3D)
  • simplifié via une technique d'homogénéisation
 (soft material)
A region … enables the modeling …
Specific Transient Magnetic solid conductor

of a medium:

magnetic (permeability μr)

conducting (resistivity ρ)

(can be: passive/active)

1 See Describing the source

Thin regions

Thin regions enable the modeling of regions of slight thickness.

  • The following region types are available for a 2D application:
    • Air-gap (= Air or vacuum ) region
    • Coil conductor region
    • Solid conductor region (passive or active)
  • The following region types are available for a 3D application:
    • Air-gap (= Air or vacuum ) region
    • Magnetic region

Filiform regions

Filiform regions enable the modeling of small cross-section regions.

  • The following region type is available for a 2D application:
    • Coil conductor region
  • The following region type is available for a 3D application:
    • Magnetic region