Non-uniform grid accelerated local–global boundary condition (NG-LGBC) for acoustic scattering

A global absorbing boundary condition utilizing accelerated integration scheme based on the non-uniform grid (NG) approach is hybridized with a local boundary condition, producing an accurate and efficient mesh truncation scheme for finite method analysis of open-region acoustic scattering problems. The method affords arbitrarily shaped, in particular non-convex boundaries that conform to essentially concave obstacles of dimensions large compared with the wavelength.