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- W2963766999 abstract "Spacetime Discontinuous Galerkin (DG) methods are used to solve hyperbolic PDEs describing wavelike physical phenomena. When the PDEs are nonlinear, the speed of propagation of the phenomena, called the wavespeed, at any point in the spacetime domain is computed as part of the solution. We give an advancing front algorithm to construct a simplicial mesh of the spacetime domain suitable for DG solutions. Given a simplicial mesh of a bounded linear or planar space domain M, we incrementally construct a mesh of the spacetime domain M x [0,infinity) such that the solution can be computed in constant time per element. We add a patch of spacetime elements to the mesh at every step. The boundary of every patch is causal which means that the elements in the patch can be solved immediately and that the patches in the mesh are partially ordered by dependence. The elements in a single patch are coupled because they share implicit faces; however, the number of elements in each patch is bounded. The main contribution of this paper is sufficient constraints on the progress in time made by the algorithm at each step which guarantee that a new patch with causal boundary can be added to the mesh at every step even when the wavespeed is increasing discontinuously. Our algorithm adapts to the local gradation of the space mesh as well as the wavespeed that most constrains progress at each step. Previous algorithms have been restricted at each step by the maximum wavespeed throughout the entire spacetime domain." @default.
- W2963766999 created "2019-07-30" @default.
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- W2963766999 date "2004-01-01" @default.
- W2963766999 modified "2023-09-25" @default.
- W2963766999 title "Efficient Spacetime Meshing with Nonlocal Cone Constraints." @default.
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