Remarks for Various Boundary IntegralEquations Reduced from the ExteriorNeumann Problem of Helmholtz Equation[J]. Journal of Civil and Environmental Engineering, 1998, 20(2).
Remarks for Various Boundary IntegralEquations Reduced from the ExteriorNeumann Problem of Helmholtz Equation[J]. Journal of Civil and Environmental Engineering, 1998, 20(2). DOI: 10.11835/j.issn.1674-4764.1998.02.008.
This paper presents a discussion on various boundary integral equations reduced from the exterior Neumann problem of Helmholtz equation.The author analyses how the famous difficulty that some equations have no unique solution when the wave number k is an eigenvalue of an interior problem is arised in the course of reducing these equations from Helmholtz representations
and proposes a method of overcoming the difficulty
that is
introducing a direct boundary integral equation which has unique solution for all wave numbers k and is equivalent to the original boundary value problem.Besides
advantages and shortcomings for these integral equations are estimated respectively.