Abstract
The gas dynamics equations, coupled with a static gravitational field, admit the hydrostatic balance where the flux produced by the pressure is exactly canceled by the gravitational source term. Many astrophysical problems involve the hydrodynamical evolution in a gravitational field, therefore it is essential to correctly capture the effect of gravitational force in the simulations. Improper treatment of the gravitational force can lead to a solution which either oscillates around the equilibrium, or deviates from the equilibrium after a long time run. In this paper we design high order well-balanced finite difference WENO schemes to this system, which can preserve the hydrostatic balance state exactly and at the same time can maintain genuine high order accuracy. Numerical tests are performed to verify high order accuracy, well-balanced property, and good resolution for smooth and discontinuous solutions. The main purpose of the well-balanced schemes designed in this paper is to well resolve small perturbations of the hydrostatic balance state on coarse meshes. The more difficult issue of convergence towards such hydrostatic balance state from an arbitrary initial condition is not addressed in this paper.
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Dedicated to Professor Stanley Osher on the occasion of his 70th birthday.
Y. Xing research was sponsored by the Office of Advanced Scientific Computing Research; U.S. Department of Energy. The work was partially performed at the ORNL, which was managed by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725.
C.-W. Shu research was supported by ARO grant W911NF-11-1-0091 and NSF grant DMS-1112700.
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Xing, Y., Shu, CW. High Order Well-Balanced WENO Scheme for the Gas Dynamics Equations Under Gravitational Fields. J Sci Comput 54, 645–662 (2013). https://doi.org/10.1007/s10915-012-9585-8
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DOI: https://doi.org/10.1007/s10915-012-9585-8