期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 196, 期 45-48, 页码 4672-4689出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2007.06.001
关键词
convected Helmholtz equation; convected wave equation; aeroacoustics; subgrid scale stabilization; aerodynamic sound
An algebraic subgrid scale finite element method formally equivalent to the Galerkin Least-Squares method is presented to improve the accuracy of the Galerkin finite element solution to the two-dimensional convected Helmholtz equation. A stabilizing term has been added to the discrete weak formulation containing a stabilization parameter whose value turns to be the key for the good performance of the method. An appropriate value for this parameter has been obtained by means of a dispersion analysis. As an application, we have considered the case of aerodynamic sound radiated by incompressible flow past a two-dimensional cylinder. Following Lighthill's acoustic analogy, we have used the time Fourier transform of the double divergence of the Reynolds stress tensor as a source term for the Helmholtz and convected Helmholtz equations and showed the benefits of using the subgrid scale stabilization. (c) 2007 Elsevier B.V. All rights reserved.
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