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Spectral method solution of the Stokes equations on nonstaggered grids. (English) Zbl 0721.76057
Summary: The Stokes equations are solved using spectral methods with staggered and nonstaggered grids. Numerous ways to avoid the problem of spurious pressure modes are presented, including new techniques using the pseudospectral method and a method solving the weak form of the governing equations [a variation on the “spectral element” method developed by A. T. Patera, ibid. 54, 468-488 (1984; Zbl 0535.76035)]. The pseudospectral methods using nonstaggered grids are simpler to implement and have comparable or better accuracy than the staggered grid formulations. Three test cases are presented: a formulation with an exact solution, a formulation with homogeneous boundary conditions, and the driven cavity problem. The solution accuracy is shown to be greatly improved for the driven cavity problem when the analytical solution of the singular flow behavior in the upper corners is separated from the computational solution.

MSC:
76M25 Other numerical methods (fluid mechanics) (MSC2010)
76D07 Stokes and related (Oseen, etc.) flows
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