洪黎丹
福建理工大学智慧海洋科学技术学院
Space-time collocation multiple -scale Trefftz method for two-dimensional wave Equations
This research introduces a precise and efficient semi-analytical meshless approach for resolving two-dimensional (2D) wave equations. It utilizes a novel space-time (ST) Trefftz basis function to improve numerical accuracy. To tackle the problem of a highly ill-conditioned linear equation system, this study employs a multiple-scale characteristic length (MSCL). With specified initial and boundary conditions, collocation points are strategically placed along the ST domain boundary, converting the initial value problem into a boundary-value problem. This technique enables the virtual reconstruction of wave propagation in a 2D domain. Several examples are presented to demonstrate the method’s effectiveness in solving 2D wave equations. A benchmark example validates the method’s feasibility and accuracy. In the numerical examples, segments of the exact solutions for forward and inverse problems assess accuracy. The results are compared with other techniques, demonstrating that the proposed method offers superior accuracy. The accuracy and convergence of the ST semi-analytical approach are tested on various numerical examples with differing boundary conditions and geometries.
洪黎丹,现任福建理工大学智慧海洋科学技术学院讲师、硕士生导师,同时担任福建省水利学会青年学术工作委员会秘书。主要研究方向为无网格数值方法及其在海洋工程与水利工程中的应用。目前主持包括自然资源部海洋环境探测技术与应用重点实验室开放基金项目、福建理工大学科研发展基金项目、福建理工大学海洋研究专项基金项目以及多项横向科研项目在内的科研工作,已在 Engineering Analysis with Boundary Elements, Mathematics, Applied Sciences, Natural Hazards 等国内外学术期刊发表论文 10 篇。