Bath Numerical Analysis seminar
Numerical Analysis Research Group, Department of Mathematical Sciences, University of Bath
Location: 1W3.6
Time: Friday, 12:1513:15
Everyone is welcome at these talks. Feel free to join us for lunch after the seminar.
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Overview
 Overview
 Details

 20070202 William McLean, Numerical solution of a fractional diffusion equation,
 20070209 Bruce Boutelje, A nonsmooth error bound for multistep approximations of semilinear parabolic equations,
 20070216 Jan Van lent, Multigrid methods for convectiondominated elliptic equations,
 20070223 Melina Freitag, Inexact inverse iteration for the generalised nonsymmetric eigenproblem  Convergence, preconditioning and comparison to JacobiDavidson,
 20070302 Sabine Le Borne, Discrete divergencefree basis through HQR factorization,
 20070309 Sean Buckeridge, An introduction to multigrid,
 20070316 Stefano Giani, Convergence of adaptive methods for elliptic eigenvalue problems,
 20070323 unplanned, last day of teaching
 20070330 no seminar, Easter Vacation
 20070406 no seminar, Easter vacation
 20070413 no seminar, Easter Vacation
 20070420 Adrian Hill, Stability results for discrete timevarying systems,
 20070425(Wed,13:1514:15) Sven Hammarling, Recent Advances in LAPACK and ScaLAPACK, [Wednesday, 13:1514:15, same location as usual (BICS room 1W3.6)]
 20070427(13:1514:15) Sean Rigby, Experimental and modelling studies of percolation and coupled diffusion/reaction processes in porous catalysts, [Unusual time! 13:1514:15]
 20070504 Richard Norton, title to be confirmed
 20070511 Jennifer A. Scott, An introduction to HSL and the solution of sparse linear systems,
 20070518 unplanned, exam time
 20070525 Raphael Hauser, Relative Robust Optimisation and the Portfolio Problem,
 20070601 Laura Hewitt, DIMSIMs and Reducible GLMs,
 20070608 Sebastien Guenneau, Finite element models for electromagnetic waves in twisted fibres and other cylindrical media undergoing geometric transforms,
 Previous Seminars
Details
20070202 William McLean, Numerical solution of a fractional diffusion equation,
William McLean (University of New South Wales, Sydney)
http://web.maths.unsw.edu.au/~mclean
Title : Numerical solution of a fractional diffusion equation
20070209 Bruce Boutelje, A nonsmooth error bound for multistep approximations of semilinear parabolic equations,
Bruce Boutelje (University of Bath)
http://www.maths.bath.ac.uk/~ma9brb/
Title : A nonsmooth error bound for multistep approximations of semilinear parabolic equations
20070216 Jan Van lent, Multigrid methods for convectiondominated elliptic equations,
Jan Van lent (University of Bath)
http://www.maths.bath.ac.uk/~jvl20
Title : Multigrid methods for convectiondominated elliptic equations
Abstract :
I will discuss the paper Ordering Techniques for two and threedimensional convectiondominated elliptic boundary value problems by Sabine Le Borne.
20070223 Melina Freitag, Inexact inverse iteration for the generalised nonsymmetric eigenproblem  Convergence, preconditioning and comparison to JacobiDavidson,
Melina Freitag (University of Bath)
http://www.maths.bath.ac.uk/~mamamf
Title : Inexact inverse iteration for the generalised nonsymmetric eigenproblem  Convergence, preconditioning and comparison to JacobiDavidson
20070302 Sabine Le Borne, Discrete divergencefree basis through HQR factorization,
Sabine Le Borne (Tennessee Technological University)
http://www.math.tntech.edu/sleborne/
Title : Discrete divergencefree basis through HQR factorization
20070309 Sean Buckeridge, An introduction to multigrid,
Sean Buckeridge (University of Bath)
Title : An introduction to multigrid
20070316 Stefano Giani, Convergence of adaptive methods for elliptic eigenvalue problems,
Stefano Giani (University of Bath)
Title : Convergence of adaptive methods for elliptic eigenvalue problems
20070323 unplanned, last day of teaching
20070330 no seminar, Easter Vacation
20070406 no seminar, Easter vacation
20070413 no seminar, Easter Vacation
20070420 Adrian Hill, Stability results for discrete timevarying systems,
Adrian Hill (University of Bath)
http://people.bath.ac.uk/masath
Title : Stability results for discrete timevarying systems
20070425(Wed,13:1514:15) Sven Hammarling, Recent Advances in LAPACK and ScaLAPACK, [Wednesday, 13:1514:15, same location as usual (BICS room 1W3.6)]
Sven Hammarling (NAG)
http://www.nag.co.uk/about/shammarling.asp http://www.maths.manchester.ac.uk/~sven/
Title : Recent Advances in LAPACK and ScaLAPACK
20070427(13:1514:15) Sean Rigby, Experimental and modelling studies of percolation and coupled diffusion/reaction processes in porous catalysts, [Unusual time! 13:1514:15]
Sean Rigby (University of Bath, Department of Chemical Engineering)
http://www.bath.ac.uk/chemeng/staff/profiles/seanrigby.shtml
Title : Experimental and modelling studies of percolation and coupled diffusion/reaction processes in porous catalysts
20070504 Richard Norton, title to be confirmed
Richard Norton (University of Bath)
20070511 Jennifer A. Scott, An introduction to HSL and the solution of sparse linear systems,
Jennifer A. Scott (Rutherford Appleton Laboratory)
http://www.numerical.rl.ac.uk/people/jscott/jscott.html
Title : An introduction to HSL and the solution of sparse linear systems
Abstract :
HSL is a collection of portable, fully documented and tested Fortran packages for large scale scientific computation. HSL is primarily written and developed by the Numerical Analysis Group at the Rutherford Appleton Laboratory. It offers users a high standard of reliability and has an international reputation as a source of robust and efficient numerical software. HSL is widely used by both academics and commerical organisations in the UK and worldwide. This talk will provide a brief introduction to HSL and, in particular, will introduce the sparse linear solvers for which HSL is renowned.
20070518 unplanned, exam time
20070525 Raphael Hauser, Relative Robust Optimisation and the Portfolio Problem,
Raphael Hauser
http://web.comlab.ox.ac.uk/oucl/people/raphael.hauser.html
Title : Relative Robust Optimisation and the Portfolio Problem
Abstract :
Consider the framework in which a utility function depends on a vector of uncertain parameters which are only known to lie in a given uncertainty set.
Relative robust optimisation is a framework in which the objective function is defined as the loss of utility relative to a benchmark that would choose the optimising values for the decision variables if the uncertain parameters were known.
Given this socalled regret function, one seeks to minimise (over the decision variables) the pessimised (over the parameter variables) regret. The resulting problem is a trilevel optimisation problem which can be approximated by a tractable conic programming problem.
We investigate this approximability and identify cases in which the tractable approximation solves the original problem. The resulting technique can be applied in portfolio optimisation.
20070601 Laura Hewitt, DIMSIMs and Reducible GLMs,
Laura Hewitt (University of Bath)
http://www.maths.bath.ac.uk/~ma0llh
Title : DIMSIMs and Reducible GLMs
Abstract :
DIMSIMs are a class of general linear methods with diagonally implicit stage equations. I will present some approaches to finding algebraically stable DIMSIMs. This talk will also include some ideas on the reducibility of general linear methods, which is joint work with John Butcher.
20070608 Sebastien Guenneau, Finite element models for electromagnetic waves in twisted fibres and other cylindrical media undergoing geometric transforms,
Sebastien Guenneau (University of Liverpool)
http://www.maths.liv.ac.uk/~guenneau/
Title : Finite element models for electromagnetic waves in twisted fibres and other cylindrical media undergoing geometric transforms