A SIMPLIFIED h-BOX METHOD FOR EMBEDDED BOUNDARY GRIDS

作者：Berger Marsha^*; Helzel Christiane

来源：SIAM Journal on Scientific Computing, 2012, 34(2): A861-A888.

DOI：10.1137/110829398

• Cartesian grid cut cell method
• finite volume
• conservation laws

We present a simplified h-box method for integrating time-dependent conservation laws on embedded boundary grids using an explicit finite volume scheme. By using a method of lines approach with a strong stability preserving Runge Kutta method in time, the complexity of our previously introduced h-box method is greatly reduced. A stable, accurate, and conservative approximation is obtained by constructing a finite volume method where the numerical fluxes satisfy a certain cancellation property. For a model problem in one space dimension using appropriate limiting strategies, the resulting method is shown to be total variation diminishing. In two space dimensions, stability is maintained by using rotated h-boxes as introduced in previous work [M. J. Berger and R. J. LeVeque, Comput. Systems Engrg., 1 (1990), pp. 305-311; C. Helzel, M. J. Berger, and R. J. LeVeque, SIAM J. Sci. Comput., 26 (2005), pp. 785-809], but in the new formulation, h-box gradients are taken solely from the underlying Cartesian grid, which also reduces the computational cost.

• 出版日期2012