Eliminating the fictitious frequency problem in BEM solutions of the external Helmholtz equation

  title={Eliminating the fictitious frequency problem in BEM solutions of the external Helmholtz equation},
  author={Evert Klaseboer and F. Charlet and Boo Cheong Khoo and Qiang Sun and Derek Y. C. Chan},
  journal={Engineering Analysis with Boundary Elements},

Including monopoles to a fully desingularized boundary element method for acoustics

The inclusion of domain (point) sources into a three dimensional boundary element method while solving the Helmholtz equation is described. The method is fully desingularized which allows for the use

Helmholtz equation and non-singular boundary elements applied to multi-disciplinary physical problems

It is reviewed here how a recently developed singularity-free 3D boundary element framework with superior accuracy can be used to tackle problems only using one or more Helmholtz equations with higher order (quadratic) elements which can tackle complex shapes.

Field-only surface integral equations: scattering from a perfect electric conductor.

A field-only boundary integral formulation of electromagnetics is derived without the use of surface currents that appear in the Stratton-Chu formulation, which allows high-order elements with fewer degrees of freedom to represent surface features to a higher precision than the traditional planar elements.

A non-singular boundary element method for interactions between acoustical field sources and structures

. Localized point sources (monopoles) in an acoustical domain are implemented to a three dimensional non-singular Helmholtz boundary element method in the frequency domain. It allows for the

Solution of the 3D Helmholtz equation using barycentric Lagrange interpolation collocation method

PurposeThis meshless collocation method is applicable not only to the Helmholtz equation with Dirichlet boundary condition but also mixed boundary conditions. It can calculate not only the high



Boundary regularized integral equation formulation of the Helmholtz equation in acoustics

A boundary integral formulation for the solution of the Helmholtz equation is developed in which all traditional singular behaviour in the boundary integrals is removed analytically, resulting in a significant reduction in the problem size with improved precision.

On the exterior problems of acoustics

  • F. Ursell
  • Mathematics
    Mathematical Proceedings of the Cambridge Philosophical Society
  • 1973
Abstract The method of integral equations is the most familiar method of proving existence theorems for the Helmholtz equation of acoustics. The wave potentials are expressed as surface distributions

Fictitious frequency revisited.

On modified Green functions in exterior problems for the Helmholtz equation

  • R. KleinmanG. Roach
  • Mathematics
    Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
  • 1982
The question of non-uniqueness in boundary integral equation formulations of exterior problems for the Helmholtz equation has recently been resolved with the use of additional radiating multipoles in

Multiple scattering and modified Green's functions