Past Seminars
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Thu, 06/11/2003 16:15 |
Panagiota Kanti (Oxford) |
Oxral Series (Fisher Room of NAPL)  |
NAPL |
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Thu, 06/11/2003 15:00 |
Boris Zilber |
COW Algebraic Geometry Seminar |
L2 |
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Thu, 06/11/2003 14:00 |
Dr Eric Fraga (UCL) |
Computational Mathematics and Applications |
Rutherford Appleton Laboratory, nr Didcot |
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The process industries are one of the UK's major sectors and include
petrochemicals, pharmaceuticals, water, energy and the food industry,
amongst others. The design of a processing plant is a difficult task. This
is due to both the need to cater for multiple criteria (such as economics,
environmental and safety) and the use highly complex nonlinear models to
describe the behaviour of individual unit operations in the process. Early
in the design stages, an engineer may wish to use automated design tools to
generate conceptual plant designs which have potentially positive attributes
with respect to the main criteria. Such automated tools typically rely on
optimization for solving large mixed integer nonlinear programming models.
This talk presents an overview of some of the work done in the Computer Aided Process Engineering group at UCL. Primary emphasis will be given to recent developments in hybrid optimization methods, including the use of graphical interfaces based on problem specific visualization techniques to allow the engineer to interact with embedded optimization procedures. Case studies from petrochemical and water industries will be presented to demonstrate the complexities involved and illustrate the potential benefits of hybrid approaches. |
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Thu, 06/11/2003 11:00 |
Advanced Logic Class |
L3 | |
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Wed, 05/11/2003 12:00 |
Jan Gutowski (Oxford) |
String Theory Seminar |
L3 |
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Tue, 04/11/2003 17:00 |
Charles Batty (Oxford) |
Functional Analysis Seminar |
L3 |
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Tue, 04/11/2003 17:00 |
Dr A Jaikin (Madrid and Imperial College) |
Algebra Seminar |
L1 |
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Tue, 04/11/2003 12:00 |
Prof Unruh (UBC) |
Relativity Seminar |
L3 |
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Mon, 03/11/2003 17:00 |
Roger Plymen (Manchester) |
Topology Seminar |
L3 |
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Mon, 03/11/2003 17:00 |
Carlos Mora-Corral (Madrid) |
Applied Analysis and Mechanics Seminar |
L1 |
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Mon, 03/11/2003 15:45 |
Wilhelm Stannat (Universitaet Bielefeld) |
Stochastic Analysis Seminar |
DH 3rd floor SR |
| http://www.maths.ox.ac.uk/notices/events/abstracts/stochastic-analysis/m... | |||
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Mon, 03/11/2003 15:30 |
Lorenz Halbeisen (Belfast) |
Analytic Topology in Mathematics and Computer Science |
L3 |
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Mon, 03/11/2003 14:15 |
Thomas Schick (Goettingen) |
Geometry and Analysis Seminar |
L3 |
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Mon, 03/11/2003 14:15 |
Eva Riccomagno (University of Warwick) |
Stochastic Analysis Seminar |
DH 3rd floor SR |
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Fri, 31/10/2003 16:30 |
Timothy Gowers |
Special Seminar |
L2 |
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Thu, 30/10/2003 16:30 |
Tim Browning (Oxford) |
Number Theory Seminar |
L2 |
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Thu, 30/10/2003 16:30 |
Prof P J Holmes (Princeton University) |
Differential Equations and Applications Seminar |
DH 3rd floor SR |
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Thu, 30/10/2003 14:00 |
Dr Robert Scheichl (University of Bath) |
Computational Mathematics and Applications |
Comlab |
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The simulation of sedimentary basins aims at reconstructing its historical
evolution in order to provide quantitative predictions about phenomena
leading to hydrocarbon accumulations. The kernel of this simulation is the
numerical solution of a complex system of time dependent, three
dimensional partial differential equations of mixed parabolic-hyperbolic
type in highly heterogeneous media. A discretisation and linearisation of
this system leads to large ill-conditioned non-symmetric linear systems
with three unknowns per mesh element.
In the seminar I will look at different preconditioning approaches for these systems and at their parallelisation. The most effective preconditioner which we developed so far consists in three stages: (i) a local decoupling of the equations which (in addition) aims at concentrating the elliptic part of the system in the "pressure block”; (ii) an efficient preconditioning of the pressure block using AMG; (iii) the "recoupling” of the equations. Numerical results on real case studies, exhibit (i) a significant reduction of sequential CPU times, up to a factor 5 with respect to the current ILU(0) preconditioner, (ii) robustness with respect to physical and numerical parameters, and (iii) a speedup of up to 4 on 8 processors. |
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Thu, 30/10/2003 11:00 |
Logic Seminar |
L3 | |
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Tue, 28/10/2003 17:00 |
Jim Brooks (Florida State) |
Functional Analysis Seminar |
L3 |
