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Nonlinear Dynamics & Applied PDEs Group  
         

General Information

 

Mathematical models of phenomena in the physical sciences or processes in the engineering and biological sciences invariably take the form of nonlinear dynamical systems and partial differential equations (PDEs). The expertise of the Nonlinear Dynamics and Applied PDEs group lies in attacking these systems with the modern techniques of applied mathematics, such as symmetry and asymptotic methods coupled with numerical explorations and dynamical systems theory.

Occasionally the goal is to understand the creation of patterns from otherwise featureless background states, or the onset of new dynamical behaviour (such as synchrony in populations of coupled oscillators). But the mathematics involved in these problem is often of equal interest, entailing novel twists and turns in the application of mathematical technology, and motivating the development of new techniques or adaptations of existing ones.

Gray-Scott model in a square domain: self-replication of a localised stripe pattern, followed by the breakup of the stripe into a zigzag instability and then into localised spots
 
Patterns in the Gray-Scott reaction-diffusion model in a square domain: the evolution of an initial triangle depends sensitively on the model parameters
 
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Core Faculty

The Nonlinear Dynamics & Applied PDEs Group is composed of several core IAM faculty who are actively involved in the IAM activities and supervise IAM students or postdoctoral fellows. We are always interested to hear from potential students or fellows with background in mathematics, physics or engineering. We often supervise undergraduate thesis projects and take on summer research undergraduate students. Candidates interested in research in Nonlinear Dynamics & Applied PDEs in the IAM are encouraged to contact one or more of the core faculty as potential supervisors and let them know of their interests.

 
Neil Balmforth
Neil is a Professor in the Department of Mathematics and in Earth and Ocean Sciences. His research interests include geophysical and astrophysical fluid dynamics and complex fluid flow. He has co-organised and directed a variety of programmes in Geophysical Fluid Dynamics, including the summer school at the Woods Hole Oceanographic Institution. Since 2008, Neil has been the Director of the IAM.
George Bluman
George is a Professor in the Department of Mathematics and was one of the founding members of the IAM. He has worked extensively in the development of analytical techniques to extract exact solutions to nonlinear PDEs and to identify their conservations laws. In particular, he has written a number of influential texts and articles on similarity and symmetry methods, with applications ranging from mathematial physics to solid mechanics.
Rachel Kuske
Rachel is a Professor and Head of the Department of Mathematics. Her research interests span over stochastic and nonlinear dynamics, asymptotics and semianalytic approximations, mathematics in industry, and mathematical modelling in general. Specific research projects include noise sensitivity, localised phenomena, coherence resonance with applications in neurodynamics, infectious diseases, mechanical systems, hydraulic fractures, and mathematical finance. Since 2002, Rachel has been a Canada Research Chair in Applied Mathematics.
Wayne Nagata
Wayne is a Professor in the Department of Mathematics. His work focusses on dynamical systems and their applications, particularly in mathematical biology. Examples of Wayne's research projects include investigation of pattern formation in growing plant tips, study of periodic travelling waves in oscillatory reaction-difusion models for predator-prey systems, and a dynamic analysis of a differentially heated rotating fluid annulus.
Anthony Peirce
Anthony is a Professor in the Department of Mathematics and a former Director of the IAM from 1999 to 2000. He started his research career working in a laboratory dedicated to solving problems in the mining industry in South Africa. His research interests include: application of control to molecular systems, analysis of instabilities in elasto-plastic materials, development of specialised numerical algorithms to model large-scale rock fracture processes, numerical and analytic studies of reactive flows in porous media, and more recently, the asymptotic and numerical analysis of hydraulic fracture propagation. Anthony's work exploits techniques from functional, numerical and asymptotic analysis, as well as dynamical systems theory.
Michael Ward
Michael is a Professor in the Department of Mathematics, and was the Director of the IAM from 2003 to 2008. Michael's research focusses on analysing various nonlinear PDE models of physical applied mathematics using asymptotic, singular-perturbation, dynamical-system, and numerical methods. The areas of application include the study of localised structures in biological and chemical pattern formation, PDE models of microelectrical-mechanical systems, spatial aspects of biological cell signalling, pattern formation in ecology, and coarsening in models of slow phase separation.
 
       
Modelling prey-predator dynamics: spatiotemporal patterns in prey density following an invasion by a predator for different values of the predator death rate
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Recommended Courses

Courses given by IAM faculty provide the foundation for research in Nonlinear Dynamics & Applied PDEs, as well as outlining the essential tools which comprise the classical and modern techniques of Applied Mathematics.

 
Spot self-replication in the Schnakenburg reaction-diffusion model in a rectangular domain
 

Preliminary and Foundational Courses
MATH 400: Partial Differential Equations
MATH 401: Green Functions and Variational Methods
MATH 450/550: Perturbation Methods
MATH 521: Numerical Analysis of PDEs
MATH 552: Dynamical Systems Theory
MATH 607E: Numerical Methods for Differential Equations

Nonlinear Dynamics & Applied PDEs Courses
MATH 551: Asymptotic Analysis for PDEs
MATH 553: Advanced Dynamical Systems
MATH 554: Symmetries and Differential Equations
MATH 556: Industrial Mathematical Modelling

Further Options
MATH 522: Numerical Analysis
MATH 557: Linear and Nonlinear Waves
 
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Sample Publications

Listed below are some of the recent theses and journal publications by IAM students, IAM faculty, IAM postdoctoral fellows and IAM alumni in the field of Nonlinear Dynamics & Applied PDEs. Click on the item of interest to open a thesis file, an article pdf on the author's web page, or an article abstract on the journal site.

 
Alexei Cheviakov, Michael Ward and Ronny Straube. An Asymptotic Analysis of the Mean First Passage Time for Narrow Escape Problems: Part II: The Sphere. SIAM Multiscale Modeling and Simulation, Vol. 8, No. 3, pp. 836-872 (2010).

Samara Pillay, Michael Ward, Anthony Peirce and Theodore Kolokolnikov. An Asymptotic Analysis of the Mean First Passage Time for Narrow Escape Problems, Part I: Two-Dimensional Domains. SIAM Multiscale Modeling and Simulation, Vol. 8, No. 3, pp. 803-835 (2010).

Alan Lindsay. Topics in the Asymptotic Analysis of Linear and Nonlinear Eigenvalue Problems. Ph.D. Thesis, University of British Columbia (2010).

Sandra Merchant. Spatiotemporal Patterns in Mathematical Models for Predator Invasions. Ph.D. Thesis, University of British Columbia (2009).

Wan Chen. Localized Patterns in the Gray-Scott Model: An Asymptotic and Numerical Study of Dynamics and Stability. Ph.D. Thesis, University of British Columbia (2009).

Na Yu. Stochastic Phase Dynamics in Neuron Models and Spike Time Reliability. Ph.D. Thesis, University of British Columbia (2009).

Rachel Kuske and Peter Borowski. Survival of Subthreshold Oscillations: The Interplay of Noise, Bifurcation Structure, and Return Mechanism. Submitted to Discrete and Continuous Dynamical Systems – Series S.

Rachel Kuske. Competition of Noise Sources in Systems with Delay: The Role of Multiple Time Scales. Submitted to Journal of Vibration and Control.

Sandra Merchant and Wayne Nagata. Wave Train Selection Behind Invasion Fronts in Reaction-Diffusion Predator-Prey Models. Submitted to Physica D.

Alan Lindsay and Michael Ward. Asymptotics of Some Nonlinear Eigenvalue Problems for a MEMS Capacitor, Part I: Fold Point Asymptotics. Methods and Applications of Analysis, Vol. 15, No. 3, pp. 297-326 (2008).

Alan Lindsay and Michael Ward. Asymptotics of Some Nonlinear Eigenvalue Problems for a MEMS Capacitor: Part II: Multiple Solutions and Singular Asymptotics. To appear in European Journal of Applied Mathematics.

Wan Chen and Michael Ward. The Stability and Dynamics of Localized Spot Patterns in the Two-Dimensional Gray-Scott Model. Submitted to SIAM Journal of Applied Dynamical Systems.

Na Yu, Rachel Kuske, Yue-Xian Li. Stochastic Phase Dynamics and Noise-induced Mixed-mode Oscillations in Coupled Oscillators. Chaos (2008).

George Bluman, Alexei Cheviakov and Jean-François Ganghoffer. Nonlocally Related PDE Systems for One-Dimensional Nonlinear Elastodynamics. Journal of Engineering Mathematics, 62, pp. 203-221 (2008).

Sarah Mitchell, Rachel Kuske, and Anthony Peirce. An Asymptotic Framework for Finite Hydraulic Fractures Including Leak-Off. SIAM Journal on Applied Mathematics, 67(2), pp. 364-386 (2007).

 
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Last Update: 24 Nov 2010 UBC Institute of Applied Mathematics © 2010 All rights reserved.