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JOURNALS // Zhurnal Vychislitel'noi Matematiki i Matematicheskoi Fiziki // Archive

Zh. Vychisl. Mat. Mat. Fiz., 2020 Volume 60, Number 10, Pages 1697–1710 (Mi zvmmf11144)

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.

UDC: 519.624

Received: 21.01.2020
Revised: 15.04.2020
Accepted: 03.06.2020

DOI: 10.31857/S0044466920100105


 English version:
Computational Mathematics and Mathematical Physics, 2020, 60:10, 1642–1655

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© Steklov Math. Inst. of RAS, 2024