Method of moving frames to solve the shallow water equations on arbitrary rotating curved surfaces

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• 作者：S. Chun^a ; ¹ ; ^{sehun.chun@yonsei.ac.kr} ; C. Eskilsson^b ; ^{claes.eskilsson@chalmers.se}
• 关键词：Shallow water equations ; Spherical geometry ; Curved surface ; Moving frames ; Discontinuous Galerkin method ; High-order finite elements
• 刊名：Journal of Computational Physics
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：333
• 期：Complete
• 页码：1-23
• 全文大小：5978 K
• 卷排序：333

文摘

A novel numerical scheme is proposed to solve the shallow water equations (SWEs) on arbitrary rotating curved surfaces. Based on the method of moving frames (MMF) in which the geometry is represented by orthonormal vectors, the proposed scheme not only has the fewest dimensionality both in space and time, but also does not require either of metric tensors, composite meshes, or the ambient space. The MMF–SWE formulation is numerically discretized using the discontinuous Galerkin method of arbitrary polynomial order p   in space and an explicit Runge–Kutta scheme in time. The numerical model is validated against six standard tests on the sphere and the optimal order of convergence of p+1p+1 is numerically demonstrated. The MMF–SWE scheme is also demonstrated for its efficiency and stability on the general rotating surfaces such as ellipsoid, irregular, and non-convex surfaces.