I am an Associate Professor of Numerical Analysis and Scientific Computing in the Numerical Analysis group of the University of Oxford, and a Tutorial Fellow at Oriel College, Oxford.
I work on the numerical solution of partial differential equations, with a particular focus on
I have applied the numerical techniques I develop to various applications, in the areas of renewable energy, cardiac electrophysiology, glaciology, magnetohydrodynamics, quantum mechanics, and liquid crystals.
2022-07-25: I will talk at the SciCADE International Conference on Scientific Computation and Differential Equations in Reykjavik, Iceland.
2022-07-11: I will give an invited presentation at the Equadiff 15 conference in Brno, Czechia.
2022-06-26: I will attend the 30 years of Acta Numerica conference at the Banach Centre in Będlewo, Poland.
2022-05-30: I will give a mini lecture course at the EMS summer school on mathematical modelling, numerical analysis and scientific computing in Kácov, Czechia, that was deferred from 2020.
2022-04-11: I will give a talk at the workshop on Recent Advances in Numerical Linear Algebra for PDEs, Optimization, and Data Assimilation at the ICMS in Edinburgh, organised by John Pearson and Jemima Tabeart.
2022-01-01: I will join the SISC Editorial Board as an Associate Editor.
2021-10-13: A new paper is up on arXiv about variational and numerical analysis of a Q-tensor model for smectic-A liquid crystals, with Jingmin Xia.
2021-09-28: I gave a talk in the Topology Optimization Webinar.
Congratulations to Fabian Laakmann on winning a best presentation prize at Firedrake '21!
2021-09-15: A new paper is up on arXiv about accounting for thermodiffusion in the Onsager-Stefan-Maxwell equations, with Alexander Van-Brunt and Charles Monroe.
2021-08-03: A new paper is up on arXiv about the analysis of semicoercive Stokes variational inequalities arising in glaciology, with Gonzalo Gonzalez de Diego and Ian Hewitt.
2021-08-02: A new paper is up on arXiv about fast and p-robust solvers for very high-order FEM discretisations using the fast diagonalisation method, with Pablo Brubeck.
2021-07-19: I attended the Conference on Numerical Analysis and Acoustics in Devon, England. It was incredible to see research talks and socialise in person again! Thanks to Sheehan Olver and Anastasia Kisil for organising it.
2021-07-06: Congratulations to Jingmin Xia on winning a permanent position at the National University of Defense Technology in Changsha!
2021-07-05: I gave a talk in the Berlin Oberseminar on Optimization, Control and Inverse Problems, organised by Michael Hintermüller.
2021-07-02: I was awarded a Whitehead Prize by the London Mathematical Society.
2021-06-28: Welcome to Isaac Newell, a 3rd year student at Oriel, who'll be working with me for the summer on an LMS Undergraduate Research Bursary.
2021-06-23: I gave a talk at a minisymposium organised by Johann Rudi, Omar Ghattas, Lukas Holbach, and Georg Stadler at the SIAM Conference on Mathematical & Computational Issues in the Geosciences.
2021-06-13: I attended a workshop on Novel Mathematical Methods in Material Science: Applications to Biomaterials, held online at the Banff International Research Station.
2021-06-09: I gave a talk at the XXth International Workshop on Numerical Methods for non-Newtonian Flows, held online at the Casa Matemática Oaxaca.
2021-06-01: A new paper is up on arXiv about controlling bifurcation structures with shape optimisation, with Nicolas Boullé and Alberto Paganini. Update: accepted in SISC.
2021-05-19: Congratulations to Nicolas Boullé on being shortlisted for the 2021 IMA Leslie Fox Prize!
2021-05-18: A new paper is up on arXiv about three-field formulations for the biharmonic problem, with Scott MacLachlan and Abdalaziz Hamdan.
2021-05-17: I gave a talk at a minisymposium at the SIAM Conference on Mathematical Aspects of Materials Science, organised by Shawn Walker and Carme Calderer.
2021-05-16: A new paper is up on arXiv about changing discretisation to suit different HPC architectures, with Jack Betteridge and David Ham. Update: accepted in IEEE Computing in Science and Engineering.
2021-05-03: I am organising a BIRS workshop (21w5164) on Efficient Simulation Algorithms for Viscoelastic and Viscous non-Newtonian Fluids in Banff, Canada. Update: cancelled due to the pandemic.
2021-04-30: A new paper is up on arXiv about augmented Lagrangian preconditioners for magnetohydrodynamics, with Fabian Laakmann and Lawrence Mitchell.
2021-04-22: Congratulations to Florian Wechsung for winning a Mathematical Institute DPhil Thesis Prize!
2021-04-07: I was awarded the 2020 Charles Broyden Prize for the best paper published in Optimization Methods and Software in 2020, with Matteo Croci and Thomas Surowiec.
2021-03-29: Pablo Brubeck, Pablo Alexei Gazca Orozco, Abdalaziz Hamdan, and Razan Abu-Labdeh gave talks at the 20th Copper Mountain Conference on Multigrid Methods.
2021-03-26: Pablo Brubeck, Ioannis Papadopoulos, Francis Aznaran, Rob Kirby, and Pablo Alexei Gazca Orozco gave talks at the FEniCS 2021 conference.
2021-03-12: I gave a seminar in the Numerical Analysis and Scientific Computing seminar series at the Courant Institute.
2021-02-15: A new paper is up on arXiv about analysis of ferronematic liquid crystals in one dimension, with Apala Majumdar, James Dalby, and Jingmin Xia.
2021-02-05: A new paper is up on arXiv about discretising the Mori model of electrodiffusion and water movement in brain tissue, with Ada Ellingsrud, Marie Rognes, and Nicolas Boullé.
2021-02-02: A new paper is up on arXiv about a new model and discretisation for smectic-A liquid crystals, with Jingmin Xia, Tim Atherton, and Scott MacLachlan. Here's a video of a double screw dislocation arising in a simulation of a focal conic domain. The video shows the zero isosurfaces of the density variation, which are coloured by height to aid depth perception. Update: nominated as an editor's suggestion in Physical Review Letters.
2021-01-21: I gave a talk in the new Irish Numerical Analysis Forum.
2021-01-14: I am attending the online UKAEA ExCALIBUR-NEPTUNE kickoff meeting to design a new code to simulate the turbulent edge of a plasma in a tokamak reactor.
2020-11-17: A new paper is up on arXiv about multigrid methods for phase field modelling of multivariant martensitic formation, with Karel Tůma, Mohsen Rezaee-Hajidehi, Jaroslav Hron, and Stanislaw Stupkiewicz. Update: accepted in CMAME. Here's a video of the microstructure evolution in a pseudoelastic CuAlNi single crystal during nano-indentation.
2020-11-15: The HKIAS International Conference on Mathematical Analysis and its Applications has been rescheduled. Update: deferred (again) due to the coronavirus pandemic.
2020-11-06: A new paper is up on arXiv about discretisations and solvers for anisothermal implicitly-constituted non-Newtonian flows, with Alexei Gazca and Endre Süli. Update: accepted in Mathematics of Computation.
2020-09-30: I have been invited to give a talk in the 2nd PRISM workshop on applications beyond CFD.
2020-09-22: I have been invited to give a talk in the partial differential equations describing far-from-equilibrium open systems conference organised by Miroslav Bulíček.
2020-09-21: I served as PhD opponent for the thesis of Tomáš Gergelits on operator preconditiong at Charles University Prague. Congratulations, Tomáš!
2020-07-15: I am hosting a research visit from Emilio Silva of the University of São Paulo. Update: deferred due to the coronavirus pandemic.
2020-07-01: A paper has been accepted about the bifurcation analysis of model problems relating to kidney stone removal with Jess Williams, Sarah Waters, Simon Tavener, Derek Moulton, Ben Turney, and Alfonso Castrejón-Pita in the Journal of Fluid Mechanics.
2020-06-29: A new paper is up on arXiv about automating implicit (fully coupled) Runge-Kutta timestepping methods, with Rob Kirby and Jorge Marchena Menendez. Update: accepted in ACM Transactions on Mathematical Software.
2020-06-26: A new paper is up on arXiv about monolithic multigrid methods for magnetohydrodynamics, with James Adler, Tom Benson, Eric Cyr, Scott MacLachlan and Ray Tuminaro. Update: accepted in SIAM Journal on Scientific Computing.
2020-06-22: I am giving a talk at a minisymposium organised by Scott MacLachlan and Niall Madden at the International Linear Algebra Society meeting in Galway, Ireland. Update: deferred due to the coronavirus pandemic.
2020-06-09: I am hosting a research visit from Mark Adams of Lawrence Berkeley Laboratory. Update: deferred due to the coronavirus pandemic.
2020-06-05: I am hosting Weinan E for a colloquium at the Mathematical Institute. Update: deferred due to the coronavirus pandemic.
2020-06-05: A new paper is up on arXiv about stable discretisations for the Onsager-Stefan-Maxwell diffusion problem, with Alexander Van-Brunt and Charles Monroe. Update: accepted in IMAJNA.
2020-05-28: I am giving an online talk in the Computational Mathematics and Applications series.
2020-05-25: I will give a mini lecture course at the EMS summer school on mathematical modelling, numerical analysis and scientific computing in Kácov, Czechia. Update: deferred due to the coronavirus pandemic.
2020-05-18: I have been invited to give a lecture at the ICMS online workshop on Novel modelling insights into confined soft matter systems.
2020-05-06: A new paper is up on arXiv about augmented Lagrangian preconditioners for implicitly-constituted non-Newtonian flows, with Alexei Gazca. Update: now accepted in SISC.
2020-04-24: A new paper is up on arXiv about computing multiple solutions of topology optimisation problems, with Ioannis Papadopoulos and Thomas Surowiec. Update: accepted in SISC.
2020-04-24: I am hosting a research visit from Catherine Mavriplis of the University of Ottawa. Update: deferred due to the coronavirus pandemic.
2020-04-22: A new paper is up on arXiv about multiple solutions of Bose-Einstein condensates in three dimensions, with Panos Kevrekidis, Stathis Charalampidis and Nicolas Boullé. Update: accepted in Physical Review A.
2020-04-21: I will give a mini lecture course to the EU Regional School in Inverse Problems at RWTH Aachen University on adjoint methods. Update: deferred due to the coronavirus pandemic.
2020-04-20: A new paper is up on arXiv about Reynolds-robust solvers for the incompressible Navier-Stokes with the Scott-Vogelius discretisation on macroelements, with Ridgway Scott, Lawrence Mitchell and Florian Wechsung. Update: accepted in SMAI Journal of Computational Mathematics.
2020-04-15: A new paper is up on arXiv about augmented Lagrangian preconditioners for the Oseen-Frank model in liquid crystals, with Florian Wechsung and Jingmin Xia. Update: accepted in BIT Numerical Mathematics.
2020-02-06: A new paper is up on arXiv about robust solvers for linear elasticity with the Scott-Vogelius discretisation on macroelements, with Ridgway Scott, Lawrence Mitchell and Florian Wechsung. Update: accepted in IMAJNA.
2020-02-05: I am attending the UKAEA Fusion Modelling System workshop in Birmingham.
2020-01-24: I am hosting Panos Kevrekidis for a colloquium at the Mathematical Institute.
2020-01-16: I am hosting a research visit from Thomas Surowiec of Philipps-Universität Marburg.
2020-01-09: I am hosting a research visit from Tim Atherton of Tufts University.
2020-01-08: I am hosting a research visit from Mariano Beguerisse of Spotify.
2019-12-18: A new paper is up on arXiv about PCPATCH, a preconditioner in PETSc for the topological construction of relaxation methods, with Matt Knepley, Lawrence Mitchell and Florian Wechsung. Update: accepted in ACM TOMS.
2019-12-09: I have been invited to give a lecture at the ICERM workshop on Numerical Methods and New Perspectives for Extended Liquid Crystalline Systems organised by Apala Majumdar, Shawn Walker and Jan Lagerwall.
2019-11-29: A new paper is up on arXiv about the bifurcation analysis of two-component Bose-Einstein condensates, with Panos Kevrekidis, Stathis Charalampidis and Nicolas Boullé. Update: now published in CNSNS.
2019-11-28: I served as PhD examiner for Jack Betteridge. Congratulations!
2019-11-21: I have been invited to give a lecture at the HKIAS International Conference on Mathematical Analysis and its Applications by Philippe Ciarlet and John Ball. Update: sadly this conference has been deferred until next year due to the closure of the university.
2019-11-15: I am hosting Doug Arnold for a colloquium at the Mathematical Institute.
2019-11-13: I served as DPhil examiner for Thomas Roy. Congratulations!
2019-11-04: I am hosting a research visit from Simon Tavener of Colorado State University.
2019-10-28: I am visiting the Geometry, compatibility and structure preservation in computational differential equations programme at the Isaac Newton Institute in Cambridge. I will talk on the 31st.
2019-10-25: I am giving a talk in the Bath Numerical Analysis Seminar.
2019-10-23: I am giving a talk in the Imperial-UCL Numerics Seminar.
2019-10-18: I am hosting Reidun Twarock for a colloquium at the Mathematical Institute.
2019-10-01: Welcome to Gonzalo Gonzalez de Diego, Nicolas Boullé, Alexander Van-Brunt, Fabian Laakmann, and Francis Aznaran, who all start their DPhils with me today! Gonzalo is co-supervised by Ian Hewitt, Alexander by Charles Monroe, and Francis by Endre Süli.
2019-09-26: I am hosting a research visit from Ridgway Scott of the University of Chicago.
2019-09-04: I am hosting Aretha Teckentrup of the University of Edinburgh for the viva of Zhenru Wang.
2019-09-01: Welcome to Panos Kevrekidis, who is visiting myself and Heather Harrington on sabbatical for a year! His sabbatical is generously supported by a Visiting Professorship award from the Leverhulme Trust.
2019-08-26: A new paper is up on arXiv about local Fourier analysis of additive Vanka schemes for the Stokes equations, with Yunhui He and Scott MacLachlan. Update: now published in NLAA.
2019-08-08: I have been awarded a Departmental Teaching Award by the Mathematical Institute for my lecture course C6.4 Finite Element Methods for PDEs.
2019-07-29: I am visiting Scott MacLachlan of Memorial University of Newfoundland for a month. This visit is generously funded by an LMS Scheme 4 grant.
2019-07-09: I am visiting Anton Schiela at the University of Bayreuth.
2019-07-01: I am giving a plenary talk at the Preconditioning conference in Minneapolis, Minnesota.
2019-06-10: I am visiting Josef Málek of Charles University Prague.
2019-06-07: I am hosting Michael Hintermüller for a colloquium at the Mathematical Institute.
2019-05-22: I am giving a talk at the Bath-Oxford-Strathclyde meeting on liquid crystals.
2019-04-30: A new paper is up on arXiv about deflation for semismooth equations and variational inequalities, with Matteo Croci and Thomas Surowiec. Update: now published in OMS.
2019-04-19: A new paper is up on arXiv about three-field finite element discretisations for implicitly-constituted non-Newtonian flows, with Alexei Gazca and Endre Süli. Update: now published in SINUM.
2019-04-02: I am giving a talk at the LMS Mathematics in Life Sciences conference in Oxford.
2019-03-24: I am giving a talk at the 19th Copper Mountain Conference on Multigrid Methods in Colorado.
2019-01-11: I am attending the SIAM UKIE meeting in Oxford.
2018-11-13: I am hosting a research visit from Lawrence Mitchell of Durham University.
2018-11-02: I am hosting Jon Keating for a colloquium at the Mathematical Institute.
2018-10-15: I am visiting Saullo Castro at TU Delft.
2018-10-01: I am hosting a research visit from Scott MacLachlan of Memorial University of Newfoundland.
2018-10-01: Welcome to Jingmin Xia and Ioannis Papadopoulos, who begin their DPhil studies today! Ioannis is co-supervised by Endre Süli.
2018-09-17: I am hosting a research visit from Thomas Surowiec of Philipps-Universität Marburg.
2018-08-30: I am giving another lecture course to the group of Emilio Silva, this time on adjoints.
2018-08-09: A new paper is up on arXiv about Reynolds-robust preconditioners for the incompressible Navier-Stokes, with Lawrence Mitchell and Florian Wechsung. Update: now published in SISC.
2018-07-09: I am attending the SIAM annual meeting in Portland, Oregon.
2018-06-18: I am giving a summer (winter?) school on finite elements to the group of Emilio Silva at the Escola Politécnica of the University of São Paulo.
2018-06-15: I am hosting Alfio Quarteroni for a colloquium at the Mathematical Institute.
2018-04-26: I am giving a seminar in MOX, Dipartimento di Matematica, Politecnico di Milano.
2018-03-21: I am hosting the 2018 FEniCS conference in Oxford.
2017-11-26: A new paper has been accepted on glaciological inverse problems in Pine Island Glacier, Antarctica, with Teresa Kyrke-Smith and Hilmar Gudmundsson.
2017-07-18: I am giving an invited seminar at the annual meeting of the Canadian Applied and Industrial Mathematics society in Halifax, Nova Scotia.
2017-06-26: I am teaching a summer school on finite elements and FEniCS at the University of Chicago, with Ridgway Scott.
2017-06-14: A new paper is up on arXiv about the bifurcation analysis of cholesteric liquid crystals, with David Emerson, James Adler, Scott MacLachlan and Timothy Atherton.
2017-05-26: I am giving an invited seminar at the SIAM UKIE National Student Chapter Conference in Galway, Ireland.
2017-05-25: A new paper has been accepted on the bifurcation analysis of Bose-Einstein condensates, with Stathis Charalampidis and Panos Kevrekidis.
2017-04-10: I am teaching a guest lecture course PMR5412 Modelling and Numerical Simulation via Variational Calculus at the Escola Politécnica of the University of São Paulo, hosted by Emilio Silva and the Research Centre for Gas Innovation.
2017-03-20: I am spending a few weeks at the Institute for Pure and Applied Mathematics at UCLA, as part of the Computational Issues in Oil Field Applications programme.
2017-01-20: I have been appointed as an editorial board member of SIAM’s Fundamentals of Algorithms book series.
2016-10-01: I am delighted to announce that I have been appointed as an Associate Professor in the Mathematical Institute and as a Tutorial Fellow at Oriel College.
2016-10-01: Welcome to Florian Wechsung, and Matteo Croci, who begin their DPhil studies today under my supervision! My co-supervisors are Mark Taylor of London Computational Solutions (Florian), and Marie Rognes of Simula Research Laboratory and Mike Giles (Matteo).
2016-06-21: A new paper is up on the arXiv about geometric Markov chain Monte Carlo methods for infinite-dimensional inverse problems with Alex Beskos, Shiwei Lan, Mark Girolami and Andrew Stuart.
2016-06-10: I’m teaching at a summer school on Frontiers in PDE-constrained Optimization at the IMA in Minnesota.
2016-03-16: A new paper is up on arXiv about optimal preconditioners for the Ohta–Kawasaki equations with John Pearson.
2016-03-15: There’s an open faculty position in numerical analysis in Oxford (an associate professorship). Apply by April 29!
2016-01-28: A new paper is up on arXiv about using deflation to compute multiple equilibria of nematic liquid crystals with James Adler, David Emerson and Scott MacLachlan.
2015-11-30: Another paper is up on arXiv about linear and nonlinear solvers in variational fracture mechanics with Corrado Maurini. The code that supports the manuscript is available on bitbucket.
2015-09-19: Images from the SIAM Awards Lunch in Beijing are online.
2015-09-18: I gave the invited scientific lecture to the annual general meeting of NAG.
2015-09-01: A new paper is up on arXiv about PDE-constrained optimisation, deflation and Schur complement preconditioners.
2015-08-31: I’ve just released a Python implementation of Mike Giles’ multilevel Monte Carlo demo code.
2015-08-27: The first deflation paper has been published online in SISC.
2015-08-13: I collected the Wilkinson prize at ICIAM 2015 in Beijing today. Thanks again to NAG, ANL and NPL.
2015-07-16: I have been selected for polar service with the British Antarctic Survey! I will be undertaking fieldwork in the Antarctic this November as part of an observational campaign on the retreating ice sheets on the east coast of the Antarctic peninsula, on Flask Glacier and Scar Inlet.
2015-06-23: I came second in the Fox prize competition, joining company such as Andy Wathen, Peter Sweby, Alan Edelman, Mark Ainsworth, Barry Smith, and Des Higham. Congratulations to Iain Smears and Alex Townsend.
2015-06-11: I have won the 2015 Wilkinson prize for Numerical Software, along with my colleagues Simon Funke, David Ham and Marie Rognes.
2015-03-06: I have been shortlisted for the 17th IMA Leslie Fox prize in numerical analysis.