Article information

2018 , Volume 23, ¹ 2, p.20-36

Kashirin A.A., Smagin S.I.

Numerical solution of integral equations for the three-dimensional scalar diffraction problems

Purpose. The purpose of the article is to develop efficient algorithms for numerical solution of the diffraction (transmission) problem of stationary acoustic waves on threedimensional homogeneous inclusions. Methods. By using the combinations of simple and double layer potentials, two Fredholm boundary integral equations of the first kind with one unknown function are obtained for these potentials, each of which is equivalent to the original problem. When sampling these equations, a special method of averaging integral operators with weak singularities in the kernels is applied. Outcomes. The obtained integral equations are approximated by systems of linear algebraic equations with easily-calculated coefficients, which are then solved numerically by means of the generalized method of minimal residuals (GMRES). A series of computing experiments for numerical solution of particular stationary three-dimensional diffraction problems of acoustic waves has been conducted. Conclusions. Computing experiments have shown that the proposed numerical method possesses high accuracy in finding approximate solutions of these problems. It allows both effective parallelization and ability to perform calculations in a wide range of wave numbers and can be used to solve other problems of mathematical physics, formulated in the form of boundary integral equations.

[full text]
Keywords: diffraction problem, Helmholtz equation, boundary integral equation, numerical method of solution

doi: 10.25743/ICT.2018.23.12756

Author(s):
Kashirin Alexey Alekseevich
PhD. , Associate Professor
Position: Senior Research Scientist
Office: Computer Center FEB RAS
Address: Russia, Khabarovsk, 65, Kim Yu Chen str.
E-mail: elomer@mail.ru
SPIN-code: 1948-3033

Smagin Sergey Ivanovich
Dr. , Correspondent member of RAS, Professor
Position: Director
Office: Computer Center FEB RAS
Address: 680000, Russia, Khabarovsk
Phone Office: (4212) 22 72 67
E-mail: smagin@ccfebras.ru
SPIN-code: 2419-4990

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Bibliography link:
Kashirin A.A., Smagin S.I. Numerical solution of integral equations for the three-dimensional scalar diffraction problems // Computational technologies. 2018. V. 23. ¹ 2. P. 20-36
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