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|Title:||$hp$-Version space-time discontinuous Galerkin methods for parabolic problems on prismatic meshes|
Georgoulis, Emmanuil H.
|Publisher:||Society for Industrial and Applied Mathematics|
|Citation:||SIAM Journal on Scientific Computing, 2017, 39(4), A1251–A1279|
|Abstract:||We present a new hp-version space-time discontinuous Galerkin (dG) finite element method for the numerical approximation of parabolic evolution equations on general spatial meshes consisting of polygonal/polyhedral (polytopic) elements, giving rise to prismatic space-time elements. A key feature of the proposed method is the use of space-time elemental polynomial bases of total degree, say p, defined in the physical coordinate system, as opposed to standard dG-time-stepping methods whereby spatial elemental bases are tensorized with temporal basis functions. This approach leads to a fully discrete hp-dG scheme using fewer degrees of freedom for each time step, compared to dG time-stepping schemes employing tensorized space-time basis, with acceptable deterioration of the approximation properties. A second key feature of the new space-time dG method is the incorporation of very general spatial meshes consisting of possibly polygonal/polyhedral elements with arbitrary number of faces. A priori error bounds are shown for the proposed method in various norms. An extensive comparison among the new space-time dG method, the (standard) tensorized space-time dG methods, the classical dG-time-stepping, and conforming finite element method in space, is presented in a series of numerical experiments.|
|Rights:||Copyright © 2017, Society for Industrial and Applied Mathematics. Deposited with reference to the publisher’s open access archiving policy.|
|Description:||AMS subject classifications. 65N30, 65M60, 65J10|
|Appears in Collections:||Published Articles, Dept. of Mathematics|
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|space_time_DG_final.pdf||Post-review (final submitted author manuscript)||4.41 MB||Adobe PDF||View/Open|
|16m1073285.pdf||Published (publisher PDF)||417.37 kB||Adobe PDF||View/Open|
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