title: Solving the hypersingular boundary integral equation in three-dimensional acoustics using a regularization relationship.
abstract: Regularization of the hypersingular integral in the normal derivative of the conventional Helmholtz integral equation through a double surface integral method or regularization relationship has been studied. By introducing the new concept of discretized operator matrix, evaluation of the double surface integrals is reduced to calculate the product of two discretized operator matrices. Such a treatment greatly improves the computational efficiency. As the number of frequencies to be computed increases, the computational cost of solving the composite Helmholtz integral equation is comparable to that of solving the conventional Helmholtz integral equation. In this paper, the detailed formulation of the proposed regularization method is presented. The computational efficiency and accuracy of the regularization method are demonstrated for a general class of acoustic radiation and scattering problems. The radiation of a pulsating sphere, an oscillating sphere, and a rigid sphere insonified by a plane acoustic wave are solved using the new method with curvilinear quadrilateral isoparametric elements. It is found that the numerical results rapidly converge to the corresponding analytical solutions as finer meshes are applied.
authors.affiliation: Institute of High Performance Computing, 1 Science Park Road #01-01 The Capricorn, Singapore Science Park II, Singapore 117528.
authors.forename: Zai You
authors.initials: ZY
authors.lastname: Yan
authors.forename: Kin Chew
authors.initials: KC
authors.lastname: Hung
authors.forename: Hui
authors.initials: H
authors.lastname: Zheng