In the subroutines that solve axisymmetric Helmholtz problems ( HIBEMA, HEBEMA and SEMA) the boundaries must be represented in the form of a set of truncated cone shells. In axisymmetric problems the surface can be defined by specifying the points on the generator and sweeping through 2p. In order that the normal to the boundary points outward rather than inward the two nodes that define each element must be listed in the clockwise direction around the generator of the boundary. The programs HIBEMA_T, and HEBEMA_T each solve Helmholtz problems in which the boundary under consideration is that of a sphere of unit radius.

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