Volume 13, Issue 5
Fekete-Gauss Spectral Elements for Incompressible Navier-Stokes Flows: the Two-Dimensional Case

Laura Lazar, Richard Pasquetti & Francesca Rapetti

Commun. Comput. Phys., 13 (2013), pp. 1309-1329.

Published online: 2013-05

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  • Abstract

Spectral element methods on simplicial meshes, say TSEM, show both the advantages of spectral and finite element methods, i.e., spectral accuracy and geometrical flexibility. We present a TSEM solver of the two-dimensional (2D) incompressible Navier-Stokes equations, with possible extension to the 3D case. It uses a projection method in time and piecewise polynomial basis functions of arbitrary degree in space. The so-called Fekete-Gauss TSEM is employed, i.e., Fekete (resp. Gauss) points of the triangle areusedas interpolation(resp. quadrature)points. For the sakeof consistency, isoparametric elements are used to approximate curved geometries. The resolution algorithm is based on an efficient Schur complement method, so that one only solves for the element boundary nodes. Moreover, the algebraic system is never assembled, therefore the number of degrees of freedom is not limiting. An accuracy study is carried out and results are provided for classical benchmarks: the driven cavity flow, the flow between eccentric cylinders and the flow past a cylinder.

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