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Magnetostatics/electromagnet.pro

@@ -15,7 +15,20 @@
        Run (button at the bottom of the left panel)
    ------------------------------------------------------------------- */
 
-/* Electromagnetic fields expand to infinity. The corresponding boundary
+/* This model computes the static magnetic field produced by a DC current. This
+   corresponds to a "magnetostatic" physical model, obtained by combining the
+   time-invariant Maxwell-Ampere equation (curl h = js, with h the magnetic
+   field and js the source current density) with Gauss' law (Div b = 0, with b
+   the magnetic flux density) and the magnetic constitutive law (b = mu h, with
+   mu the magnetic permeability).
+
+   Since Div b = 0, b can be derived from a vector magnetic potential a, such
+   that b = curl a. Plugging this potential in Maxwell-Ampere's law and using
+   the constitutive law leads to a vector Poisson equation in terms of the
+   magnetic vector potential: curl(nu curl a) = js, where nu = 1/mu is
+   the reluctivity.
+
+   Electromagnetic fields expand to infinity. The corresponding boundary
    condition can be imposed rigorously by means of a gometrical transformation
    that maps a ring (or shell) of finite elements to the complementary of its
    interior.  As this is a mere geometric transformation, it is enough in the
@@ -38,20 +51,7 @@
    editable in the GUI before running the model.  Such variables are called
    ONELAB variables (because the sharing mechanism between the model and the GUI
    uses the ONELAB interface).  ONELAB parameters are defined with a
-   "DefineNumber" statement, which can be invoked in the .geo and .pro files.
-
-   This model computes the static magnetic field produced by a DC current. This
-   corresponds to a "magnetostatic" physical model, obtained by combining the
-   time-invariant Maxwell-Ampere equation (curl h = js, with h the magnetic
-   field and js the source current density) with Gauss' law (Div b = 0, with b
-   the magnetic flux density) and the magnetic constitutive law (b = mu h, with
-   mu the magnetic permeability).
-
-   Since Div b = 0, b can be derived from a vector magnetic potential a, such
-   that b = curl a. Plugging this potential in Maxwell-Ampere's law and using
-   the constitutive law leads to a vector Poisson equation in terms of the
-   magnetic vector potential: curl(nu curl a) = js, where nu = 1/mu is
-   the reluctivity. */
+   "DefineNumber" statement, which can be invoked in the .geo and .pro files. */
 
 Group {
   // Physical regions: