摘要
In this paper,Chebyshev interpolation nodes and barycentric Lagrange interpolation basis function are used to deduce the scheme for solving the Helmholtz equation.First of all,the interpolation basis function is applied to treat the spatial variables and their partial derivatives,and the collocation method for solving the second order differential equations is established.Secondly,the differential matrix is used to simplify the given differential equations on a given test node.Finally,based on three kinds of test nodes,numerical experiments show that the present scheme can not only calculate the high wave numbers problems,but also calculate the variable wave numbers problems.In addition,the algorithm has the advantages of high calculation accuracy,good numerical stability and less time consuming.
基金
partially supported by National Natural Science Foundation of China(11772165,11961054,11902170)
Key Research and Development Program of Ningxia(2018BEE03007)
National Natural Science Foundation of Ningxia(2018AAC02003,2020AAC03059)
Major Innovation Projects for Building First-class Universities in China’s Western Region(Grant No.ZKZD2017009).
