/*
	Acoustic cavity with smooth walls, two mechanical interfaces, and obstacle.
 */
cl1 = 0.01;
fine = 0.01;
Point(1) = {0, 0, 0, cl1};
Point(2) = {0.1, 0, 0, cl1};
Point(3) = {0.1, 0.4, 0, cl1};
Point(4) = {0, 0.4, 0, cl1};
Point(5) = {0.2, -0, 0, fine};
fine = 0.01;
Point(6) = {0.2, -0, 0, fine};
Point(7) = {0.2, 0.4, 0, fine};
Point(8) = {0.2, 0.1, 0, fine};
Point(9) = {0.1, 0.1, 0, fine};
Point(10) = {0.1, 0.2, 0, fine};
Point(11) = {0.2, 0.2, 0, fine};
Point(12) = {0.2, 0.3, 0, fine};
BSpline(1) = {2, 5, 8, 9, 10, 11, 12, 7, 3};
Line(2) = {1, 2};
Line(3) = {3, 4};
Line(4) = {4, 1};
/* simplier geometry for testing:
Line(7) = {2,3};
Line Loop(5) = {4, 2, 7, 3};
Physical Line(13) = {7};
*/
Line Loop(5) = {4, 2, 1, 3};
Plane Surface(6) = {5};
Physical Line(10) = {4};
Physical Line(11) = {2};
Physical Line(12) = {3};
Physical Line(13) = {1};
Physical Surface(20) = {6};
