Combined Finite Element and Spectral Approximation of the Navier-Stokes Equations.
Y. Maday, A. Quarteroni, C. Canuto (1984)
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Y. Maday, A. Quarteroni, C. Canuto (1984)
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We consider a model coupling the Darcy equations in a porous medium with the Navier-Stokes equations in the cracks, for which the coupling is provided by the pressure's continuity on the interface. We discretize the coupled problem by the spectral element method combined with a nonoverlapping domain decomposition method. We prove the existence of solution for the discrete problem and establish an error estimation. We conclude with some numerical tests confirming the results of our analysis. ...
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Nehla Abdellatif, Christine Bernardi (2010)
ESAIM: Mathematical Modelling and Numerical Analysis
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We analyze a new formulation of the Stokes equations in three-dimensional axisymmetric geometries, relying on Fourier expansion with respect to the angular variable: the problem for each Fourier coefficient is two-dimensional and has six scalar unknowns, corresponding to the vector potential and the vorticity. A spectral discretization is built on this formulation, which leads to an exactly divergence-free discrete velocity. We prove optimal error estimates.