Showing papers by "Stanley Osher published in 1987"

Uniformly high-order accurate nonoscillatory schemes

Abstract: We begin the construction and the analysis of nonoscillatory shock capturing methods for the approximation of hyperbolic conservation laws. These schemes share many desirable properties with total variation diminishing schemes, but TVD schemes have at most first-order accuracy, in the sense of truncation error, at extrema of the solution. In this paper we construct a uniformly second-order approximation, which is nonoscillatory in the sense that the number of extrema of the discrete solution is not increasing in time. This is achieved via a nonoscillatory piecewise-linear reconstruction of the solution from its cell averages, time evolution through an approximate solution of the resulting initial value problem and an average of this approximate solution over each cell.

A high order essentially non-oscillatory shock capturing method

Abstract: A special class of shock capturing methods for the approximation of hyperbolic conservation laws is presented. This class of methods produce essentially non-oscillatory solutions. This means that a Gibbs phenomenon at discontinuities is avoided and the variation of the numerical approximation may only grow due to the truncation error in the smooth part of the solution. The schemes have thus many of the desirable properties of total variation diminishing schemes, but they have the advantage that any order of accuracy can be achieved.