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Volume 5, Issue 2-4
Bilinear Forms for the Recovery-Based Discontinuous Galerkin Method for Diffusion

Marc van Raalte & Bram van Leer

Commun. Comput. Phys., 5 (2009), pp. 683-693.

Published online: 2009-02

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The present paper introduces bilinear forms that are equivalent to the recovery-based discontinuous Galerkin formulation introduced by Van Leer in 2005. The recovery method approximates the solution of the diffusion equation in a discontinuous function space, while inter-element coupling is achieved by a local L2 projection that recovers a smooth continuous function underlying the discontinuous approximation. Here we introduce the concept of a local “recovery polynomial basis” – smooth polynomials that are in the weak sense indistinguishable from the discontinuous basis polynomials – and show it allows us to eliminate the recovery procedure. The recovery method reproduces the symmetric discontinuous Galerkin formulation with additional penalty-like terms depending on the targeted accuracy of the method. We present the unique link between the recovery method and discontinuous Galerkin bilinear forms. 

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@Article{CiCP-5-683, author = {Marc van Raalte and Bram van Leer}, title = {Bilinear Forms for the Recovery-Based Discontinuous Galerkin Method for Diffusion}, journal = {Communications in Computational Physics}, year = {2009}, volume = {5}, number = {2-4}, pages = {683--693}, abstract = {

The present paper introduces bilinear forms that are equivalent to the recovery-based discontinuous Galerkin formulation introduced by Van Leer in 2005. The recovery method approximates the solution of the diffusion equation in a discontinuous function space, while inter-element coupling is achieved by a local L2 projection that recovers a smooth continuous function underlying the discontinuous approximation. Here we introduce the concept of a local “recovery polynomial basis” – smooth polynomials that are in the weak sense indistinguishable from the discontinuous basis polynomials – and show it allows us to eliminate the recovery procedure. The recovery method reproduces the symmetric discontinuous Galerkin formulation with additional penalty-like terms depending on the targeted accuracy of the method. We present the unique link between the recovery method and discontinuous Galerkin bilinear forms. 

}, issn = {1991-7120}, doi = {https://doi.org/}, url = {http://global-sci.org/intro/article_detail/cicp/7757.html} }
TY - JOUR T1 - Bilinear Forms for the Recovery-Based Discontinuous Galerkin Method for Diffusion AU - Marc van Raalte & Bram van Leer JO - Communications in Computational Physics VL - 2-4 SP - 683 EP - 693 PY - 2009 DA - 2009/02 SN - 5 DO - http://doi.org/ UR - https://global-sci.org/intro/article_detail/cicp/7757.html KW - AB -

The present paper introduces bilinear forms that are equivalent to the recovery-based discontinuous Galerkin formulation introduced by Van Leer in 2005. The recovery method approximates the solution of the diffusion equation in a discontinuous function space, while inter-element coupling is achieved by a local L2 projection that recovers a smooth continuous function underlying the discontinuous approximation. Here we introduce the concept of a local “recovery polynomial basis” – smooth polynomials that are in the weak sense indistinguishable from the discontinuous basis polynomials – and show it allows us to eliminate the recovery procedure. The recovery method reproduces the symmetric discontinuous Galerkin formulation with additional penalty-like terms depending on the targeted accuracy of the method. We present the unique link between the recovery method and discontinuous Galerkin bilinear forms. 

Marc van Raalte and Bram van Leer. (2009). Bilinear Forms for the Recovery-Based Discontinuous Galerkin Method for Diffusion. Communications in Computational Physics. 5 (2-4). 683-693. doi:
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