A three-dimensional multi-grid staggered finite-difference time-domain method for underwater target acoustic scattering - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2021

A three-dimensional multi-grid staggered finite-difference time-domain method for underwater target acoustic scattering

Résumé

Solving the linearized equations of continuum mechanics to model the acoustic scattering of targets close to the seafloor is a challenging task. Among the traditional algorithms, staggered second-order finite-difference time-domain (FDTD) schemes combine simplicity and ease of implementation and parallelization, especially on modern GPUs. They have been successfully applied in two-dimensional configurations. Their major drawback is their inherent low resolution, due to their formal low order and the stair-step representation of the interfaces between media (e.g., target/water). To avoid excessive computational costs in three-dimensional configurations, while maintaining high numerical accuracy, we propose a FDTD multi-grid method. The mesh is refined locally near the interfaces, while a coarse grid is employed in homogeneous regions. In the fine grids, the aforesaid FDTD is employed, whereas, in the coarse grid, higher-order staggered schemes are used to compensate for the decrease in resolution due to the larger spacing. High-order interpolation allows matching the solutions at the grid interfaces. In this presentation, the performances of the new method on classical benchmark tests are analyzed and discussed. The numerical and computational capabilities are then illustrated by applying the proposed technique to the scattering of buried objects.
Fichier non déposé

Dates et versions

hal-04174434 , version 1 (31-07-2023)

Identifiants

Citer

Roberto Sabatini, Yan Pailhas, Giorgio Urso, Paul Cristini, Angeliki Xenaki, et al.. A three-dimensional multi-grid staggered finite-difference time-domain method for underwater target acoustic scattering. 181st Meeting of the Acoustical Society of America, Nov 2021, Seattle, United States. pp.A208-A208, ⟨10.1121/10.0008136⟩. ⟨hal-04174434⟩
7 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More