One World Numerical Analysis

Home > What's on > One World Numerical Analysis

One World Numerical Analysis

 Nov 01 2021

14:00 - 15:00

Organisers:

  • Lehel Banjai, Heriot-Watt Univerity
  • Emmanuil Georgoulis, University of Leicester/NTU Athens
  • María López Fernández, University of Malaga
  • Charalambos Makridakis, IACM/University of Sussex/Crete
  • Daniel Peterseim, University of Augsburg

 

This is a One World Seminar Series.

The seminars occur every two weeks, on a Monday (14:00-15:00 BST).

Register Here

Zoom links will be sent on the Friday prior to each seminar, with a reminder on Monday morning.

Recordings of talks given as part of this series can be found here.

 

Future Seminars

 
1 November 2021
 
Ricardo H. Nochetto (U Maryland) Large Isometric Deformations and their LDG Approximation

  • Slender structures that undergo large deformations with minor (thermal, electrical or chemical) actuation are ubiquitous in the construction of micro and macro devices in engineering and medicine. Their reduced 2d models consist of minimizing a second order bending energy subject to a nonconvex metric constraint. The former involves the second fundamental form of the middle plate surface and the latter is a restriction on its first fundamental form. We discuss a formal derivation of reduced models for single layer, bilayer, and prestrained plates along with equivalent formulations that make them amenable to computation. We propose a local discontinuous Galerkin (LDG) finite element approach that hinges on the notion of reconstructed Hessian, and discuss its properties including Gamma-convergence. We design discrete gradient flows to minimize the ensuing nonconvex problems and to find suitable initial configurations. We present several insightful simulations, some of practical interest, and assess a number of computational challenges of the approximation process.


15 November
 
Jesús María Sanz-Serna (University Carlos III of Madrid) Numerical integrators for the Hamiltonian Monte Carlo method
 
  • The Hamiltonian Monte Carlo (aka Hybrid Monte Carlo) method is an extremely popular Markov chain algorithm to obtain samples from a target probability distribution. The computational cost of the algorithm mostly originates from the need to numerically integrate, at each step of the chain, a Hamiltonian system of ordinary differential equations. It is therefore important to carry out those integrations as efficiently as possible. While at present the Stormer/Verlet integrator is the integrator of choice, it is possible to construct special integrators tailored to this task. These alternative integrators, while being as easy to implement as Stormer/Verlet, allow for very substantial reductions of the work required to obtain the samples. The talk will focus on the numerical analysis principles used to construct the new integrators.

 

Past Seminars

4 October 2021
 
Ralf Hiptmair (Zurich)  Operator Preconditioning (slides are available here)


24 May 2021

Endre Süli (University of Oxford) - Discrete De Giorgi--Nash--Moser theory and the finite element approximation of chemically reacting fluids
 

3 May 2021

Victorita Dolean (University of Strathclyde, Glasgow) - Robust solvers for time-harmonic wave propagation problems

 

19 April 2021

Andreas Veeser (Università degli Studi di Milano) - Accurate error bounds and equivalence of seminorms

 

22 March 2021

Maria Lopez Fernandez - Pseudospectral Roaming Contour Integral Methods for Convection-Diffusion Equations

 

8 March 2021

Carola-Bibiane Schönlie, University of Cambridge - Structure-Preserving Deep Learning

 

22 February 2021

Wolfgang Dahmen, University of South Carolina - Nonlinear Model Reduction: Recent Developments and Perspectives

 

8 February 2021

Michael Feischl, TU Vienna - Black box Algorithms for Adaptive FEM

 

11 January 2021

Ivan Oseledets, Skolkovo Institute of Science and Technology

 

14 December 2020

Nick Trefethen, University of Oxford - Exactness of Quadrature Formulas

 

30 November 2020

Max Jensen, University of Sussex - Monotone Finite Element Solution of Fully Nonlinear Differential Equations

 

16 November 2020

Desmond Higham, University of Edinburgh - Should We Be Perturbed About Deep Learning?

 

2 November 2020

Houman Owhadi, Caltech - On Learning Adapted Kernels for Numerical Approximation

 

19 October 2020

Virginie Ehrlacher, ENPC - Finite Volume Scheme for the Stefan-Maxwell System

  • Joint work with Clément Cancès and Laurent Monasse
  • Reference: Clément Cancès, Virginie Ehrlacher, Laurent Monasse, Finite volumes for the Stefan-Maxwell cross-diffusion system (2020)

 

5 October 2020

Christian Lubich, University of Tubingen - Convergent Evolving Surface Finite Element Algorithms for Geometric Evolution Equations

 

21 September 2020

Ilaria Perugia, University of Vienna - Space-Time Discontinuous Galerkin Methods for Wave Propagation

 

7 September 2020

Christoph Schwab, ETH Zurich - Exponential Convergence of hp-FEM for Spectral Fractional Diffusion in Polygons

 

20 July 2020

Alfio Quarteroni, Politecnico di Milano/Ecole Polytechnique Fédérale de Lausanne - The Mathematical Heart: a Computational Model for the Simulation of the Heart Function

 
18 October 2021
 
Aretha Teckentrup (Edinburgh) - Surrogate models in Bayesian inverse problems
 

This seminar is supported as part of the ICMS Online Mathematical Sciences Seminars.