# reluctivity

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## reluctivity

[‚rē‚lək′tiv·əd·ē]
(physics)
The reciprocal of magnetic permeability; the reluctivity of empty space is unity. Also known as magnetic reluctivity; specific reluctance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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where [[upsilon].sup.d.sub.r] is the relative differential reluctivity, and [[upsilon].sub.r] is the relative reluctivity.
(21), (25), and (26), the relative reluctivity in the stiffness matrix [S] becomes a tensor; hence,
where [[bar.[upsilon]].sup.d] = [[bar.[upsilon]].sup.d.sub.r]/[[mu].sub.0] = [[bar.[upsilon]].sup.d.sub.r][[upsilon].sub.0] is the differential reluctivity tensor.
This preconditioner can be realized by standard preconditioners, but we have to pay the price that we loose robustness with respect to the reluctivity v.
where [[epsilon].sub.r] and [[upsilon].sub.r] are the relative permittivity and reluctivity of the material, [mathematical expression not reproducible]0 and [c.sub.0] are the intrinsic impedance and the speed of light in free-space, respectively.
Since the relative reluctivity of the material [[upsilon].sub.r] is a function of the magnetic flux density, which is a function of the unknown vector [{a}.sup.n+1], the system Equation (6) is nonlinear.
In this section, the accurate solution of the ODE (2) is discussed because the relative differential reluctivity [[bar.[upsilon]].sup.d.sub.r] is used in the TDFEM formulation (23).

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