FEM4EllipticPDE/examples/borehole/boreholeMagnetMinus.geo

/**
 *  Trevor P. Irons, XRI Geophysics, LLC
 *  Test of Coloumbic Magnetic Potential
 */

lc = 1e-2;   // Target element size
R = .05;   // Magnet Radius
D0 = 10;   // Top of magnet
D1 = 11;   // Bottom of magnet

// Total Solution Space
X0 = -2.;
X1 =  2.;
Y0 = -2.;
Y1 =  2.;
Z0 =  9.;
Z1 = 12.;

////////////////////////////////////
// North Pole
/*
Point(0) = { 0, 0, D0, lc};
Point(1) = { R, 0, D0, lc};
Point(2) = { 0, R, D0, lc};
Point(3) = {-R, 0, D0, lc};

// Connect up the points
Circle(4) = {1, 0, 3};
Line(5) = {3,1};
Line Loop(6) = {4,5};
Plane Surface(7) = {6};
*/


////////////////////////////////////
// South Pole

Point(8)  = { 0,  -0.0001, D0, lc};
Point(9)  = { R,  -0.0001, D0, lc};
Point(10) = { 0, -R, D0, lc};
Point(11) = {-R,  -0.0001, D0, lc};

// Connect up the points
Circle(12) = {11, 8, 9};
Line(13) = {9, 11};
Line Loop(14) = {12, 13};
Plane Surface(15) = {14};


//////////////////////////////////////
// Extrude magnet
//Extrude {0, 0, D1-D0} { Surface{7};  }
Extrude {0, 0, D1-D0} { Surface{15}; }

/*
// Large Bounding box
Point(116)  = {X0, Y0, Z0};
Point(117)  = {X1, Y0, Z0};
Point(118)  = {X1, Y1, Z0};
Point(119)  = {X0, Y1, Z0};
Line(120) = {116,117};
Line(121) = {117,118};
Line(122) = {118,119};
Line(123) = {119,116};
Line Loop(124) = {120, 121, 122, 123}; 
Plane Surface(125) = {124};
Extrude {0, 0, Z1-Z0} { Surface{125}; }
*/

//////////////////////////////////////
// Volumes

Physical Volume("plus") = {2};
Physical Volume("minus") = {1};
//Physical Volume("background") = {3};