Nonlinear Sciences – Chaotic Dynamics
Scientific paper
1997-05-09
Nonlinear Sciences
Chaotic Dynamics
review article, 61 pages Keywords: centre manifold theory, guiding centre, slow manifold, theory and application
Scientific paper
Consider briefly the equations of fluid dynamics-they describe the enormous wealth of detail in all the interacting physical elements of a fluid flow-whereas in applications we want to deal with a description of just that which is interesting. In a wide variety of situations, simple approximate models are needed to perform practical simulations and make forecasts. I review the derivation, from a mathematical description of the detailed dynamics, of accurate, complete and useful low-dimensional models of the interesting dynamics in a system. The development of centre manifold theory and associated techniques puts this modelling process on a firm basis. As in Guckenheinmer & Holmes (1983,S2.5): "... these new methods will really be conventional perturbation style analyses interpreted geometrically..." But the geometric viewpoint of dynamical systems theory greatly enriches our approach by providing a rationale for also deriving correct initial conditions, forcing and boundary conditions for the models-all essential elements of a model.
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