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Showing results 1-50 of 107 << Previous 1 2 3    Next >>

2018
1 Lee, Jeonghun; Winther, Ragnar.
Local coderivatives and approximation of Hodge Laplace problems. Mathematics of Computation 2018 ;Volume 87.(314) p. 2709-2735
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2017
2 Bærland, Trygve; Lee, Jeonghun J.; Mardal, Kent-Andre; Winther, Ragnar.
Weakly Imposed Symmetry and Robust Preconditioners for Biot’s Consolidation Model. Computational Methods in Applied Mathematics 2017 ;Volume 17.(3) p. 377-396
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3 Hu, Kaibo; Winther, Ragnar.
Well-Conditioned Frames for Finite Element Methods. European Conference on Numerical Mathematics and Advanced Applications (ENUMATH 2017); 2017-09-25 - 2017-09-29
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4 Lee, Jeonghun; Mardal, Kent-Andre; Winther, Ragnar.
Parameter-robust discretization and preconditioning of Biot's consolidation model. SIAM Journal on Scientific Computing 2017 ;Volume 39.(1) p. A1-A24
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2015
5 Falk, Richard S.; Winther, Ragnar.
Double complexes and local cochain projections. Numerical Methods for Partial Differential Equations 2015 ;Volume 31.(2) p. 541-551
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6 Falk, Richard S.; Winther, Ragnar.
The Bubble Transform: A New Tool for Analysis of Finite Element Methods. Foundations of Computational Mathematics 2015 ;Volume 16.(1) p. 297-328
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2014
7 Arnold, Douglas N.; Awanou, Gerard; Winther, Ragnar.
Nonconforming tetrahedral mixed finite elements for elasticity. Mathematical Models and Methods in Applied Sciences 2014 ;Volume 24.(4) p. 783-796
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8 Falk, Richard S.; Winther, Ragnar.
Local bounded cochain projections. Mathematics of Computation 2014 ;Volume 83.(290) p. 2631-2656
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9 Winther, Ragnar.
Local bounded cochain projections and the bubble transform. Robust Discretizations and Fast Solvers for Computable Multi-Physics Problems; 2014-05-11 - 2014-05-19
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10 Winther, Ragnar.
Local bounded cochain projections and the bubble transform. DelMar, Numerics Day; 2014-05-09 - 2014-05-11
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2013
11 Christiansen, Snorre H; Winther, Ragnar.
On variational eigenvalue approximation of semidefinite operators. IMA Journal of Numerical Analysis 2013 ;Volume 33.(1) p. 164-189
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12 Mardal, Kent-Andre; Schoberl, Joachim; Winther, Ragnar.
A uniformly stable Fortin operator for the Taylor-Hood element. Numerische Mathematik 2013 ;Volume 123.(3) p. 537-551
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2012
13 Berre, Inga; Dahle, Helge K.; Karlsen, Kenneth Hvistendahl; Nordbotten, Jan Martin; Tai, Xue-Cheng; Winther, Ragnar.
Magne Espedal Memorial Issue. International Journal of Numerical Analysis & Modeling 2012 ;Volume 9.(3) p. I-II
UiB UiO Untitled
 
14 Winther, Ragnar.
Five Lectures on Finite Element Exterior Calculus. Applied Mathematics Summer School, 2012; 2012-08-20 - 2012-08-24
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15 Winther, Ragnar.
Uniform preconditioners and the Taylor-Hood method. Workshop on Efficient Numerical Methods for Partial Differential Equations; 2012-08-13 - 2012-08-18
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2011
16 Mardal, Kent-Andre; Winther, Ragnar.
Preconditioning discretizations of systems of partial differential equations. Numerical Linear Algebra with Applications 2011 ;Volume 18.(1) p. 1-40
UiO Untitled
 
17 Muntingh, Agnar Georg Peder.
Topics in Polynomial Interpolation Theory. Unipub forlag 2011 ;Volume 1056.119 p. Series of dissertations submitted to the Faculty of Mathematics and Natural Sciences, University of Oslo.(1056)
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18 Winther, Ragnar.
Bounded cochain projections and finite elementexterior calculus. FoCM2011; 2011-07-11 - 2011-07-15
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19 Winther, Ragnar.
Bounded cochain projections, why and how. ENUMATH2011; 2011-09-05 - 2011-09-09
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20 Winther, Ragnar.
Finite element exterior calculus - a link between topology and numerical analysis. Department colloquium; 2011-04-07 - 2011-04-07
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21 Winther, Ragnar; Mardal, Kent-Andre.
Construction of preconditioners by mapping properties for systems of partial differential equations. I: Efficient Preconditioned Solution Methods for Elliptic Partial Differential Equations. Bentham eBooks 2011 ISBN 978-1-60805-291-2. p. 65-83
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2010
22 Arnold, DN; Falk, RS; Winther, Ragnar.
FINITE ELEMENT EXTERIOR CALCULUS FROM HODGE THEORY TO NUMERICAL STABILITY. Bulletin of the American Mathematical Society 2010 ;Volume 47.(2) p. 281-354
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23 Winther, Ragnar.
Cochain projections in finite element exterior calculus. Non-standard numerical methods for partial dofferential equations; 2010-06-29 - 2010-07-02
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24 Winther, Ragnar.
Finite element exterior calculus - from Hodge theory to numerical stability. Runge - Herglotz seminar, University of Gøttingen; 2010-05-03 - 2010-05-04
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25 Winther, Ragnar.
Introduction to finite element exterior calculus. IMA tutorial: Some novel discretization techniques; 2010-10-30 - 2010-10-31
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26 Winther, Ragnar; Rognes, Marie Elisabeth.
Mixed finite element methods for linear viscoelasticity using weak symmetry. Mathematical Models and Methods in Applied Sciences 2010 ;Volume 20.(6) p. 955-985
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2009
27 Arnold, Douglas N.; Falk, Richard S.; Winther, Ragnar.
Geometric decompositions and local bases for spaces of finite element differential forms. Computer Methods in Applied Mechanics and Engineering 2009 ;Volume 198.(21-26) p. 1660-1672
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28 Halvorsen, Tore Gunnar.
Structure preserving discretizations of wave equations from theoretical physics. Oslo: Unipub AS 2009 155 p.
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29 Hu, Qiya; Tai, Xue-Cheng; Winther, Ragnar.
A saddle point approach to the computation of harmonic maps. SIAM Journal on Numerical Analysis 2009 ;Volume 47.(2) p. 1500-1523
UiB UiO Untitled
 
30 Karper, Trygve Klovning; Mardal, Kent-Andre; Winther, Ragnar.
Unified Finite Element Discretizations of Coupled Darcy-Stokes Flow. Numerical Methods for Partial Differential Equations 2009 ;Volume 25.(2) p. 311-326
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31 Tveito, Aslak; Winther, Ragnar.
Introduction to Partial Differential Equations; A Computational Approach. Springer 2009 (ISBN 978-3-540-88704-1) 392 p.
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32 Winther, Ragnar.
Preconditioning discretizations of systems of partial differential equations. Finics workshop; 2009-06-11 - 2009-06-12
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2008
33 Arnold, DN; Awanou, G; Winther, Ragnar.
Finite elements for symmetric tensors in three dimensions. Mathematics of Computation 2008 ;Volume 77. p. 1229-1251
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34 Christiansen, Snorre H; Winther, Ragnar.
Smoothed projections in finite element exterior calculus. Mathematics of Computation 2008 ;Volume 77.
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35 Karper, Trygve Klovning; Mardal, Kent-Andre; Winther, Ragnar.
Unified finite element discretizations of coupled Darcy-Stokes flow. Numerical Methods for Partial Differential Equations 2008 ;Volume 25.(2) p. 311-326
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36 Winther, Ragnar.
Finite element discretizations of the elasticity complex. 8th World Conference on Computational Mechanics; 2008-06-30 - 2008-07-04
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37 Winther, Ragnar.
Finite element exterior calculus - a link between algebraic topology and numerical analysis. 5th European Congress on Mathematics; 2008-07-14 - 2008-07-18
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38 Winther, Ragnar.
Mixed finite elements for linear elasticity and viscoelasticity. 4th Workshop on Numerical Methods for Evolution Equations; 2008-09-26 - 2008-09-27
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39 Winther, Ragnar.
Preconditioning saddle point problems arising from discretizations of partial differential equations (3 lectures). LMS Durham Symposium: Computational Linear Algebra for Partial Differential Equations; 2008-07-14 - 2008-07-24
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40 Winther, Ragnar.
Smoothed projections in finite element exterior calculus. Jim Bramble - Half a century of mathematics; 2008-05-02 - 2008-05-03
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2007
41 Arnold, DN; Falk, RS; Winther, Ragnar.
Mixed finite element methods for linear elasticity with weakly imposed symmetry. Mathematics of Computation 2007 ;Volume 76. p. 1699-1723
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2006
42 Christiansen, Snorre H; Winther, Ragnar.
Smoothed projections in finite element exterior calculus. Oslo: Department of Mathematics 2006 20 p.
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43 Christiansen, Snorre Harald; Winther, Ragnar.
On constraint preservation in numerical simulations of Yang-Mills equations. SIAM Journal on Scientific Computing 2006 ;Volume 28.
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44 Klausen, Runhild Aae; Winther, Ragnar.
Convergence of multipoint flux approximations on quadrilateral grids. Numerical Methods for Partial Differential Equations 2006 ;Volume 22. p. 1438-1454
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45 Klausen, Runhild Aae; Winther, Ragnar.
Robust convergence of multi point flux approximation on rough grids. Numerische Mathematik 2006 ;Volume 104. p. 317-337
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46 Tai, Xue-Cheng; Winther, Ragnar.
A discrete de Rham complex with enhanced smoothness. Calcolo 2006 ;Volume 43.(4) p. 287-306
UiB UiO Untitled
 
47 Winther, Ragnar.
Finite element exterior calculus and applications. China-Norway.Sweden workshop on computational mathematics; 2006-06-05 - 2006-06-07
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48 Winther, Ragnar; Arnold, Douglas N.; Falk, Richard S..
Differential complexes and stability of finite element methods. I: The de Rham complex. IMA Volumes in Mathematics and its Applications 2006 ;Volume 142. p. 23-46
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49 Winther, Ragnar; Arnold, Douglas N.; Falk, Richard S..
Differential complexes and stability of finite element methods. II: The elasticity complex. IMA Volumes in Mathematics and its Applications 2006 ;Volume 142. p. 47-68
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50 Winther, Ragnar; Arnold, Douglas N.; Falk, Richard S..
Finite element exterior calculus. Acta Numerica 2006 ;Volume 15. p. 1-155
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