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Ordinary differential equations
Computation of eigenfrequencies of an acoustic medium in a prolate spheroid by a modified abramov method
T. V. Levitina Max Planck Institute for Solar System Research, Göttingen, 37077 Germany
Abstract:
The method presented and studied in [1, 2] for solving self-adjoint multiparameter spectral problems for weakly coupled systems of ordinary differential equations is based on marching with respect to a parameter introduced into the problem. Although the method is formally applicable to systems of ordinary differential equations with singularities, its direct use for the numerical solution of the problem indicated in this paper's title is limited. A modification of the method is proposed that applies to the computation of various, including high-frequency, acoustic oscillations in both nearly spherical and strongly prolate spheroids.
Key words:
three-dimensional Helmholtz equation, separation of variables in a prolate spheroidal system of coordinates, two-parameter singular self-adjoint spectral problem, evaluation of spectral points, parameter marching, Newton's method, prolate spheroidal wave functions, whispering gallery modes.
Received: 21.01.2020 Revised: 15.04.2020 Accepted: 03.06.2020
Citation:
T. V. Levitina, “Computation of eigenfrequencies of an acoustic medium in a prolate spheroid by a modified abramov method”, Zh. Vychisl. Mat. Mat. Fiz., 60:10 (2020), 1697–1710; Comput. Math. Math. Phys., 60:10 (2020), 1642–1655
Linking options:
https://www.mathnet.ru/eng/zvmmf11144 https://www.mathnet.ru/eng/zvmmf/v60/i10/p1697
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