4.3.2 Selecting an MHD Method

The method used for MHD calculation can be selected under MHD Method in the MHD Model dialog box. The two methods, Magnetic Induction and Electrical Potential, are described in Section  2.2 and Section  2.3, respectively.

For the Magnetic Induction method, 2 or 3 user-defined scalars are allocated for the solution of the induced magnetic field in 2-D or 3-D cases. The scalars are listed as B_x, B_y and B_z representing the Cartesian components of the induced magnetic field vector. The unit for the scalar is Tesla.

For the Electrical Potential method, 1 user-defined scalar is solved for the electric potential field. The scalar is listed as $\varphi$ and has the unit of Volt.

Table  4.3.1 lists the user-defined scalars used by the two methods.

Table 4.3.1: User-Defined Scalars in MHD Model

Method	Scalar	Name	Unit	Description
Induction	Scalar-0	B_x	Tesla	X component of induced magnetic field ( $\it {b}_{x}$)
	Scalar-1	B_y	Tesla	Y component of induced magnetic field ( $\it {b}_{y}$)
	Scalar-2 (3-D)	B_z	Tesla	Z component of induced magnetic field ( $\it {b}_{z}$)
Potential	Scalar-0	Phi	Volt	Electric potential ( $\varphi$)