Computational methods for multiple scattering

Workshop theme

The accurate and efficient numerical modelling of waves interacting with complex scattering geometries is crucial for a wide range of engineering and science applications, including electromagnetic/photonic/acoustic/elastodynamic imaging and device/material design. The multiple scattering regime — i.e. wave scattering scenarios in which there are multiple interactions — includes strong scattering by multiple obstacles, periodic structures, media with variable refractive index, waveguides, random media, and non-convex obstacles. This brings special computational challenges since perturbative and one-way approximations do not apply, and ray methods usually suffer from exponential proliferation. Conventional PDE solvers are also inadequate, particularly at high frequencies, and/or when the propagation domain is highly heterogeneous (containing many scatterers, a highly variable refractive index or geometric singularities). This is a highly active numerical research field with rapid and exciting recent developments, in topics including:

- novel discretization techniques based on numerical homogenisation, integral equation methods, finite element methods (including Trefftz methods), and semi-analytic and generalised eigenfunction methods;

- acceleration techniques including preconditioning, matrix compression (including H-matrices and the fast multipole method), domain decomposition and fast direct solvers;

- robust and efficient software implementations.

The aim of this workshop is to bring together researchers working on computational methods for multiple scattering and to explore possible connections and common challenges between the different communities involved.

The application is closed

Fees

Registration Only

Registration Package: £218
Student Registration Package: £168

The Registration Package includes admission to all seminars, lunches and refreshments on the days that lectures take place (Monday - Friday), wine reception and formal dinner, but does not include other meals or accommodation.

Virtual Registration

Virtual Registration Package: £0

Virtual registration is free, and includes virtual admission to all seminars and does not include physical attendance, meals or accommodation.

Formal Dinner Only

Formal Dinner: £60

Participants on the Registration Package, including organisers and speakers, are automatically included in this event. For all remaining participants who would like to attend, such as programme participants, the above charge will apply.

Accommodation

Unfortunately we do not have any accommodation to offer so all successful applicants will need to source their own accommodation.

Please see the Hotels Combined website for a list of local hotels and guesthouses.

Meals

Lunch Lunch timings and location will be confirmed with the timetable.

Evening Meal Participants are free to make their own arrangements for dinner.

Formal Dinner The Formal Dinner will be held at Christ's College on Wednesday 19th April at 19:30.

The event is a tradition for INI participants and gives you a chance to socialise with your colleagues on a more personal level. It is not one to miss!

Participants on the Registration Package, including organisers and speakers, are automatically included in this event.

The Organisers would like to thank the following sponsors for their generous support of the event:

Timetable

Monday 17th April 2023
09:00 to 10:55	Morning coffee and registration	No Room Required
10:55 to 11:00	Ulrike Tillmann University of Oxford Welcome Talk	No Room Required
11:00 to 11:45	Simon Chandler-Wilde University of Reading Integral equations and boundary element methods for rough surface scattering	Room 1
11:45 to 12:30	Anne-Sophie Bonnet-Ben Dhia ENSTA ParisTech; CNRS (Centre national de la recherche scientifique) Complex-scaled integral equation with Laplace Green's function for time-harmonic water waves	Room 1
12:30 to 14:00	Lunch at Churchill College	No Room Required
14:00 to 14:45	Daniel Peterseim Universität Augsburg Numerical simulation of nonlinear Schrödinger equations	Room 1
14:45 to 15:30	Barbara Verfürth Universität Bonn Computational scattering in complex multiscale media	Room 1
15:30 to 16:15	Afternoon tea	No Room Required
16:15 to 17:00	Stuart Hawkins Macquarie University A fast high order algorithm for multiple scattering from large configurations of scatterers	Room 1
17:00 to 18:00	Welcome Wine Reception at INI	No Room Required

Tuesday 18th April 2023
09:00 to 09:45	Timo Betcke University College London Operator preconditioning for multiple scattering – An application oriented guide	Room 1
09:45 to 10:30	Adrianna Gillman University of Colorado Boulder A robust discretization technique for three dimensional Helmholtz problems	Room 1
10:30 to 11:00	Group photo and morning coffee	No Room Required
11:00 to 11:45	Andrea Moiola Università degli Studi di Pavia A Hausdorff-measure BEM for acoustic scattering by fractal screens - part 1	Room 1
11:45 to 12:30	Andrew Gibbs University College London A Hausdorff-measure BEM for acoustic scattering by fractal screens - part 2	Room 1
12:30 to 14:00	Lunch at Churchill College	No Room Required
14:00 to 14:45	Ruming Zhang Karlsruhe Institute of Technology (KIT) High order convergence of the PML method for periodic surface scattering problems	Room 1
14:45 to 15:30	Carlos Perez-Arancibia Universiteit Twente Density interpolation methods for volume Integral equations	Room 1
15:30 to 16:15	Afternoon Tea	No Room Required
16:15 to 17:00	Euan Spence University of Bath Is the FEM error smaller away from the scatterer than near it for high-frequency Helmholtz problems with trapping?	Room 1

Wednesday 19th April 2023
09:00 to 09:45	Patrick Joly INRIA Saclay - Île-de-France Wave propagation in unbounded quasiperiodic media	Room 1
09:45 to 10:30	Pierre Amenoagbadji ENSTA ParisTech Transmission problem between periodic half-spaces	Room 1
10:30 to 11:00	Morning coffee	No Room Required
11:00 to 11:45	Lise-Marie Imbert-Gerard University of Arizona Wave propagation in inhomogeneous media with quasi-Trefftz methods	Room 1
11:45 to 12:30	Fortino Garcia Courant Institute of Mathematical Sciences WaveHoltz: Wave Based Iterative Scheme for Helmholtz Problems	Room 1
12:30 to 14:00	Lunch at Churchill College	No Room Required
14:00 to 17:00	Free afternoon	No Room Required
19:30 to 22:00	Formal dinner at Christ's College	No Room Required

Thursday 20th April 2023
09:45 to 10:30	Carolina Urzúa-Torres Delft University of Technology Recent advances on preconditioning for BEM on complex geometries.	Room 1
10:30 to 11:00	Morning coffee	No Room Required
11:00 to 11:45	Manas Rachh Simons Foundation Efficient high-order accurate boundary integral solvers for complicated three dimensional geometries	Room 1
11:45 to 12:30	Simon Félix CNRS (Centre national de la recherche scientifique) Modal method for multiple scattering in heterogeneous and disordered media	Room 1
12:30 to 14:00	Lunch at Churchill College	No Room Required
14:00 to 14:45	Mahadevan Ganesh Colorado School of Mines High-order algorithms for time- and frequency-domain wave propagation models	Room 1
14:45 to 15:30	Berangere Delourme Université Sorbonne Paris Nord Modelisation of periodic meta-surfaces in 3 dimensions	Room 1
15:30 to 16:15	Afternoon tea	No Room Required
16:15 to 17:00	Laure Giovangigli ENSTA ParisTech Scattering from a random thin coating of nanoparticles	Room 1

Friday 21st April 2023
09:00 to 09:45	Wangtao Lu Zhejiang University Scattering of waves in orthotropic elastic media	Room 1
09:45 to 10:30	Mike Meylan University of Newcastle, Australia Time-domain calculations for multiple wave scattering	Room 1
10:30 to 11:00	Morning coffee	No Room Required
11:00 to 11:45	Stephanie Chaillat-Loseille CNRS (Centre national de la recherche scientifique) Fast Boundary Element solvers in the frequency domain to simulate coupled acoustic-elastic problems in the time domain. Application to the simulation of underwater explosions	Room 1
11:45 to 12:30	Stephen Langdon Brunel University Hybrid numerical-asymptotic boundary element methods for high frequency scattering by multiple obstacles	Room 1
12:30 to 14:00	Lunch at Churchill College	No Room Required

Mathematical theory and applications of multiple wave scattering

Computational methods for multiple scattering

Organisers

Alex Barnett Simons Foundation
Richard Craster Imperial College London
Sonia Fliss ENSTA ParisTech
David Hewett University College London
Malte Peter Universität Augsburg

Speakers

Pierre Amenoagbadji ENSTA ParisTech
Timo Betcke University College London
Anne-Sophie Bonnet-Ben Dhia ENSTA ParisTech; CNRS (Centre national de la recherche scientifique)
Stephanie Chaillat-Loseille CNRS (Centre national de la recherche scientifique)
Simon Chandler-Wilde University of Reading
Berangere Delourme Université Sorbonne Paris Nord
Simon Félix CNRS (Centre national de la recherche scientifique)
Mahadevan Ganesh Colorado School of Mines
Fortino Garcia Courant Institute of Mathematical Sciences
Andrew Gibbs University College London
Adrianna Gillman University of Colorado Boulder
Laure Giovangigli ENSTA ParisTech
Stuart Hawkins Macquarie University
Lise-Marie Imbert-Gerard University of Arizona
Patrick Joly INRIA Saclay - Île-de-France
Stephen Langdon Brunel University
Wangtao Lu Zhejiang University
Mike Meylan University of Newcastle, Australia
Andrea Moiola Università degli Studi di Pavia
Carlos Perez-Arancibia Universiteit Twente
Daniel Peterseim Universität Augsburg
Manas Rachh Simons Foundation
Euan Spence University of Bath
Carolina Urzúa-Torres Delft University of Technology
Barbara Verfürth Universität Bonn
Ruming Zhang Karlsruhe Institute of Technology (KIT)

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