The Adaptive Wavelet Collocation Method and Its Application in Front Simulation  

作　　者：黄文誉 伍荣生 方娟 

机构地区：[1]Key Laboratory of Meso-scale Severe Weather/Ministry of Education,Department of Atmospheric Sciences,Nanjing University

出　　处：《Advances in Atmospheric Sciences》2010年第3期594-604,共11页大气科学进展（英文版）

基　　金：supported by China Special Foundation for Public Service(Meteorology,GYHY200706033);Nature Science Foundation of China(Grant No.40675024);the State Key Basic Research Program(Grant No.2004CB18301)

摘　　要：The adaptive wavelet collocation method （AWCM） is a variable grid technology for solving partial differential equations （PDEs） with high singularities. Based on interpolating wavelets, the AWCM adapts the grid so that a higher resolution is automatically attributed to domain regions with high singularities. Accuracy problems with the AWCM have been reported in the literature, and in this paper problems of efficiency with the AWCM are discussed in detail through a simple one-dimensional （1D） nonlinear advection equation whose analytic solution is easily obtained. A simple and efficient implementation of the AWCM is investigated. Through studying the maximum errors at the moment of frontogenesis of the 1D nonlinear advection equation with different initial values and a comparison with the finite difference method （FDM） on a uniform grid, the AWCM shows good potential for modeling the front efficiently. The AWCM is also applied to a two-dimensional （2D） unbalanced frontogenesis model in its first attempt at numerical simulation of a meteorological front. Some important characteristics about the model are revealed by the new scheme.The adaptive wavelet collocation method （AWCM） is a variable grid technology for solving partial differential equations （PDEs） with high singularities. Based on interpolating wavelets, the AWCM adapts the grid so that a higher resolution is automatically attributed to domain regions with high singularities. Accuracy problems with the AWCM have been reported in the literature, and in this paper problems of efficiency with the AWCM are discussed in detail through a simple one-dimensional （1D） nonlinear advection equation whose analytic solution is easily obtained. A simple and efficient implementation of the AWCM is investigated. Through studying the maximum errors at the moment of frontogenesis of the 1D nonlinear advection equation with different initial values and a comparison with the finite difference method （FDM） on a uniform grid, the AWCM shows good potential for modeling the front efficiently. The AWCM is also applied to a two-dimensional （2D） unbalanced frontogenesis model in its first attempt at numerical simulation of a meteorological front. Some important characteristics about the model are revealed by the new scheme.

关 键 词：adaptive wavelet collocation method EFFICIENCY nonlinear advection unbalanced frontogenesis 

分 类 号：P435[天文地球—大气科学及气象学]