Ragnar Winther - researchr alias

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Viewing Publication 1 - 32 from 32

2024

The Bubble Transform and the de Rham ComplexRichard S. Falk, Ragnar Winther. focm, 24(1):99-147, February 2024. [doi]

2023

Construction of polynomial preserving cochain extensions by blendingRichard S. Falk, Ragnar Winther. moc, 92(342):1575-1594, February 2023. [doi]

A Uniform Preconditioner for a Newton Algorithm for Total Variation Minimization and Minimum-Surface ProblemsXue-Cheng Tai, Ragnar Winther, Xiaodi Zhang, Weiying Zheng. siamnum, 61(5):2062-2083, October 2023. [doi]

2018

Local coderivatives and approximation of Hodge Laplace problemsJeonghun J. Lee, Ragnar Winther. moc, 87(314):2709-2735, 2018. [doi]

2017

Weakly Imposed Symmetry and Robust Preconditioners for Biot's Consolidation ModelTrygve Bærland, Jeonghun J. Lee, Kent-André Mardal, Ragnar Winther. cmam, 17(3):377, 2017. [doi]

Parameter-Robust Discretization and Preconditioning of Biot's Consolidation ModelJeonghun J. Lee, Kent-André Mardal, Ragnar Winther. siamsc, 39(1), 2017. [doi]

2016

The Bubble Transform: A New Tool for Analysis of Finite Element MethodsRichard S. Falk, Ragnar Winther. focm, 16(1):297-328, 2016. [doi]

2014

Local bounded cochain projectionsRichard S. Falk, Ragnar Winther. moc, 83(290):2631-2656, 2014. [doi]

2013

A uniformly stable Fortin operator for the Taylor-Hood elementKent-André Mardal, Joachim Schöberl, Ragnar Winther. nm, 123(3):537-551, 2013. [doi]

2011

Preconditioning discretizations of systems of partial differential equationsKent-André Mardal, Ragnar Winther. nla, 18(1):1-40, 2011. [doi]

2009

CENS, CMA and the CENS-CMA ProjectJüri Engelbrecht, Ragnar Winther, Ewald Quak. In Ewald Quak, Tarmo Soomere, editors, Applied Wave Mathematics - Selected Topics in Solids, Fluids, and Mathematical Methods. pages 1-6, Springer, 2009. [doi]

A Saddle Point Approach to the Computation of Harmonic MapsQiya Hu, Xue-Cheng Tai, Ragnar Winther. siamnum, 47(2):1500-1523, 2009. [doi]

2008

Finite elements for symmetric tensors in three dimensionsDouglas N. Arnold, Gerard Awanou, Ragnar Winther. moc, 77(263):1229-1251, 2008. [doi]

Smoothed projections in finite element exterior calculusSnorre H. Christiansen, Ragnar Winther. moc, 77(262):813-829, 2008. [doi]

2007

Mixed finite element methods for linear elasticity with weakly imposed symmetryDouglas N. Arnold, Richard S. Falk, Ragnar Winther. moc, 76(260):1699-1723, 2007. [doi]

2006

2004

Uniform preconditioners for the time dependent Stokes problemKent-André Mardal, Ragnar Winther. nm, 98(2):305-327, 2004. [doi]

2002

Mixed finite elements for elasticityDouglas N. Arnold, Ragnar Winther. nm, 92(3):401-419, 2002. [doi]

Preconditioned Iterative Methods for Scattered Data InterpolationTom Lyche, Trygve K. Nilssen, Ragnar Winther. adcm, 17(3):237-256, 2002. [doi]

A Robust Finite Element Method for Darcy-Stokes FlowKent-André Mardal, Xue-Cheng Tai, Ragnar Winther. siamnum, 40(5):1605-1631, 2002. [doi]

2001

A robust nonconforming H:::2:::-elementTrygve K. Nilssen, Xue-Cheng Tai, Ragnar Winther. moc, 70(234):489-505, 2001.

2000

Multigrid in H (div) and H (curl)Douglas N. Arnold, Richard S. Falk, Ragnar Winther. nm, 85(2):197-217, 2000. [doi]

A domain embedding preconditioner for the Lagrange multiplier systemEinar Haug, Ragnar Winther. moc, 69(229):65-82, 2000.

1998

Domain embedding preconditioners for mixed systemsTorgeir Rusten, Panayot S. Vassilevski, Ragnar Winther. nla, 5(5):321-345, 1998. [doi]

1997

Preconditioning in H:::div::: and applicationsDouglas N. Arnold, Richard S. Falk, Ragnar Winther. moc, 66(219):957-984, 1997.

Domain Embedding and the Dirichlet ProblemEinar Haug, Torgeir Rusten, P. S. Vassilevski, Ragnar Winther. lssc 1997: 66-77

1996

Interior penalty preconditioners for mixed finite element approximations of elliptic problemsTorgeir Rusten, Panayot Vassilevski, Ragnar Winther. moc, 65(214):447-466, 1996.

1995

The Solution of Nonstrictly Hyperbolic Conservation Laws May Be Hard to ComputeAslak Tveito, Ragnar Winther. siamsc, 16(2):320-329, 1995. [doi]

1992

A Preconditioned Iterative Method for Saddlepoint ProblemsTorgeir Rusten, Ragnar Winther. siammax, 13(3):887-904, 1992. [doi]

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