title: A Fourier-based total-field/scattered-field technique for three-dimensional broadband simulations of elastic targets near a water-sand interface.
abstract: The numerical simulation of acoustic scattering from elastic objects near a water-sand interface is critical to underwater target identification. Frequency-domain methods are computationally expensive, especially for large-scale broadband problems. A numerical technique is proposed to enable the efficient use of finite-difference time-domain method for broadband simulations. By incorporating a total-field/scattered-field boundary, the simulation domain is restricted inside a tightly bounded region. The incident field is further synthesized by the Fourier transform for both subcritical and supercritical incidences. Finally, the scattered far field is computed using a half-space Green's function. Numerical examples are further provided to demonstrate the accuracy and efficiency of the proposed technique.
authors.affiliation: Wireless Innovation Lab, School of Information Science and Engineering, Yunnan University, Kunming, Yunnan 650091, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Shao
authors.affiliation: University of North Carolina/North Carolina State University Joint Department of Biomedical Engineering, University of North Carolina, Chapel Hill, 152 MacNider Hall, CB 7575, Chapel Hill, North Carolina 27599, USA.
authors.forename: Shumin
authors.initials: S
authors.lastname: Wang