Abstract
One of the most popular pairs of finite elements for solving mixed formulations of the Stokes and Navier–Stokes problem is the Q k −P k−1 disc element. Two possible versions of the discontinuous pressure space can be considered: one can either use an unmapped version of the P k−1 disc space consisting of piecewise polynomial functions of degree at most k−1 on each cell or define a mapped version where the pressure space is defined as the image of a polynomial space on a reference cell. Since the reference transformation is in general not affine but multilinear, the two variants are not equal on arbitrary meshes. It is well-known, that the inf-sup condition is satisfied for the first variant. In the present paper we show that the latter approach satisfies the inf-sup condition as well for k≥2 in any space dimension.
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Received January 31, 2001; revised May 2, 2002 Published online: July 26, 2002
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Matthies, G., Tobiska, L. The Inf-Sup Condition for the Mapped Q k −P k−1 disc Element in Arbitrary Space Dimensions. Computing 69, 119–139 (2002). https://doi.org/10.1007/s00607-002-1451-3
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DOI: https://doi.org/10.1007/s00607-002-1451-3