Abstract
We present optimal preconditioners for a recently introduced hybridized discontinuous Galerkin finite element discretization of the Stokes equations. Typical of hybridized discontinuous Galerkin methods, the method has degrees-of-freedom that can be eliminated locally (cell-wise), thereby significantly reducing the size of the global problem. Although the linear system becomes more complex to analyze after static condensation of these element degrees-of-freedom, the pressure Schur complement of the original and reduced problem are the same. Using this fact, we prove spectral equivalence of this Schur complement to two simple matrices, which is then used to formulate optimal preconditioners for the statically condensed problem. Numerical simulations in two and three spatial dimensions demonstrate the good performance of the proposed preconditioners.
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SR gratefully acknowledges support from the Natural Sciences and Engineering Research Council of Canada through the Discovery Grant program (RGPIN-05606-2015) and the Discovery Accelerator Supplement (RGPAS-478018-2015).
Appendix A: Auxiliary Results
Appendix A: Auxiliary Results
We provide here some auxiliary results used in analyzing the preconditioners.
Defining \(a_h^{uu}(u_h, v_h) := a_h((u_h, 0), (v_h, 0))\), since \({|\!|\!| v_h |\!|\!|}_{DG} = {|\!|\!| (v_h, 0) |\!|\!|}_v\), a consequence of Eq. (12) is:
Applying [11, Proposition 10] to a single cell K, the following inf-sup condition holds:
where \(\beta _{DG}^K > 0\) is a constant independent of h, \(V_h(K) := \mathinner { \left[ P_k(K)\right] } ^d\) and \({|\!|\!| v_h |\!|\!|}_{DG(K)}^2 := \parallel \nabla v_h \parallel ^2_{K} + \alpha h_K^{-1} \parallel v_h \parallel ^2_{\partial K}\). It follows that
where \(\beta _{DG} := \min _{K \in \mathcal {T}} \beta _{DG}^K\). Since \({|\!|\!| v_h |\!|\!|}_{DG} = {|\!|\!| (v_h, 0) |\!|\!|}_v\), it is easy to see from Eq. (26) that
where \(\bar{\beta }_{DG} > 0\) is a constant independent of h.
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Rhebergen, S., Wells, G.N. Preconditioning of a Hybridized Discontinuous Galerkin Finite Element Method for the Stokes Equations. J Sci Comput 77, 1936–1952 (2018). https://doi.org/10.1007/s10915-018-0760-4
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DOI: https://doi.org/10.1007/s10915-018-0760-4