ON NEW STRATEGIES TO CONTROL THE ACCURACY OF WENO ALGORITHM CLOSE TO DISCONTINUITIES Ⅱ:CELL AVERAGES AND MULTIRESOLUTION  

作　　者：Sergio Amat Juan Ruiz Chi-Wang Shu 

机构地区：[1]Department of Applied Mathematics and Statistics,Universidad Politecnica de Cartagena,Spain [2]Division of Applied Mathematics,Brown University,USA

出　　处：《Journal of Computational Mathematics》2020年第4期661-682,共22页计算数学（英文）

基　　金：The first and second authors have been supported through project 20928/PI/18(Proyecto financiado por la Comunidad Autonoma de la Region de Murcia a traves de la convocatoria de Ayudas a proyectos para el desarrollo de investigacion cientffica y tecnica por grupos competitivos,incluida en el Programa Regional de Fomento de la Investigacion Cientffica y Tecnica(Plan de Actuacion 2018)de la Fundacion Seneca-Agencia de Ciencia y Tecnologia de la Region de Murcia);by the national research project MTM2015-64382-P(MINECO/FEDER);The third author has been supported through the National Science Foundation grant DMS-1719410.

摘　　要：This paper is the second part of the article and is devoted to the construction and analysis of new non-linear optimal weights for WENO interpolation capable of rising the order of accuracy close to discontinuities for data discretized in the cell averages.Thus,now we are interested in analyze the capabilities of the new algorithm when working with functions belonging to the subspace L1\L2 and that,consequently,are piecewise smooth and can present jump discontinuities.The new non-linear optimal weights are redesigned in a way that leads to optimal theoretical accuracy close to the discontinuities and at smooth zones.We will present the new algorithm for the approximation case and we will analyze its accuracy.Then we will explain how to use the new algorithm in multiresolution applications for univariate and bivariate functions.The numerical results confirm the theoretical proofs presented.

关 键 词：WENO Cell averages New optimal weights Multiresolution schemes Im-proved adaption to discontinuities Signal processing 

分 类 号：O17[理学—数学]