Volume 33, Issue 2
Optimal and Pressure-Independent L² Velocity Error Estimates for a Modified Crouzeix-Raviart Stokes Element with BDM Reconstructions

C. Brennecke, A. Linke, C. Merdon & J. Schöberl

J. Comp. Math., 33 (2015), pp. 191-208.

Published online: 2015-04

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  • Abstract

Nearly all inf-sup stable mixed finite elements for the incompressible Stokes equations relax the divergence constraint. The price to pay is that a priori estimates for the velocity error become pressure-dependent, while divergence-free mixed finite elements deliver pressure-independent estimates. A recently introduced new variational crime using lowest-order Raviart-Thomas velocity reconstructions delivers a much more robust modified Crouzeix-Raviart element, obeying an optimal pressure-independent discrete H¹ velocity estimate. Refining this approach, a more sophisticated variational crime employing the lowest-order BDM element is proposed, which also allows proving an optimal pressure-independent L² velocity error. Numerical examples confirm the analysis and demonstrate the improved robustness in the Navier-Stokes case.

  • Keywords

Variational crime Crouzeix-Raviart finite element Divergence-free mixed method Incompressible Navier-Stokes equations A priori error estimates

  • AMS Subject Headings

65N30 65N15 76D07.

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{JCM-33-191, author = {Brennecke , C. and Linke , A. and Merdon , C. and Schöberl , J. }, title = {Optimal and Pressure-Independent L² Velocity Error Estimates for a Modified Crouzeix-Raviart Stokes Element with BDM Reconstructions}, journal = {Journal of Computational Mathematics}, year = {2015}, volume = {33}, number = {2}, pages = {191--208}, abstract = {

Nearly all inf-sup stable mixed finite elements for the incompressible Stokes equations relax the divergence constraint. The price to pay is that a priori estimates for the velocity error become pressure-dependent, while divergence-free mixed finite elements deliver pressure-independent estimates. A recently introduced new variational crime using lowest-order Raviart-Thomas velocity reconstructions delivers a much more robust modified Crouzeix-Raviart element, obeying an optimal pressure-independent discrete H¹ velocity estimate. Refining this approach, a more sophisticated variational crime employing the lowest-order BDM element is proposed, which also allows proving an optimal pressure-independent L² velocity error. Numerical examples confirm the analysis and demonstrate the improved robustness in the Navier-Stokes case.

}, issn = {1991-7139}, doi = {https://doi.org/10.4208/jcm.1411-m4499}, url = {http://global-sci.org/intro/article_detail/jcm/9836.html} }
TY - JOUR T1 - Optimal and Pressure-Independent L² Velocity Error Estimates for a Modified Crouzeix-Raviart Stokes Element with BDM Reconstructions AU - Brennecke , C. AU - Linke , A. AU - Merdon , C. AU - Schöberl , J. JO - Journal of Computational Mathematics VL - 2 SP - 191 EP - 208 PY - 2015 DA - 2015/04 SN - 33 DO - http://dor.org/10.4208/jcm.1411-m4499 UR - https://global-sci.org/intro/article_detail/jcm/9836.html KW - Variational crime KW - Crouzeix-Raviart finite element KW - Divergence-free mixed method KW - Incompressible Navier-Stokes equations KW - A priori error estimates AB -

Nearly all inf-sup stable mixed finite elements for the incompressible Stokes equations relax the divergence constraint. The price to pay is that a priori estimates for the velocity error become pressure-dependent, while divergence-free mixed finite elements deliver pressure-independent estimates. A recently introduced new variational crime using lowest-order Raviart-Thomas velocity reconstructions delivers a much more robust modified Crouzeix-Raviart element, obeying an optimal pressure-independent discrete H¹ velocity estimate. Refining this approach, a more sophisticated variational crime employing the lowest-order BDM element is proposed, which also allows proving an optimal pressure-independent L² velocity error. Numerical examples confirm the analysis and demonstrate the improved robustness in the Navier-Stokes case.

C. Brennecke , A. Linke , C. Merdon & J. Schöberl . (2020). Optimal and Pressure-Independent L² Velocity Error Estimates for a Modified Crouzeix-Raviart Stokes Element with BDM Reconstructions. Journal of Computational Mathematics. 33 (2). 191-208. doi:10.4208/jcm.1411-m4499
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