A Fourier-based total-field/scattered-field technique for three-dimensional broadband simulations of elastic targets near a water-sand interface

作者：Shao, Yu; Wang, Shumin^*

来源：Journal of the Acoustical Society of America, 2016, 140(6): 4183-4192.

DOI：10.1121/1.4971161

• PERFECTLY MATCHED LAYERS
• UNEXPLODED ORDNANCE UXO
• ACOUSTIC SCATTERING
• WAVE PROPAGATION
• SEA-FLOOR
• OBJECTS
• MEDIA
• APPROXIMATION

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.

• 出版日期2016-12
• 单位云南大学