A study of the bifurcation behaviour of a model of flow through a collapsible tube |
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Authors: | J P Armitstead C D Bertram O E Jensen |
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Institution: | (1) Graduate School of Biomedical Engineering, University of New South Wales, 2052 Sydney, Australia;(2) Department of Applied Mathematics and Theoretical Physics, University of Cambridge, CB3 9EW Cambridge, England |
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Abstract: | Most of the elastic tubes found in the mammalian body will collapse from a distended circular cross section and when collapsed
may undergo flow-induced oscillations. A mathematical model describing fluid flow in a collapsible tube is analysed using
the software package AUTO-86. AUTO-86 is used for continuation and bifurcation problems in systems of non-linear ordinary
differential equations. The model is a third-order lumped-parameter type and is based on the classical “Starling resistor”;
it describes the unsteady flow behaviour and, in particular, the experimentally observed self-excited oscillations, in a way
which is simple enough to give physical understanding, yet still firmly based on fluid mechanical principles. Some of the
bifurcation types found in this model bear close resemblance to the types suggested by experimental observations of self-excited
oscillations in collapsible tubes; they thus shed some light on the various topological changes which occur in practice, particularly
in view of the fact that some of the points found numerically are diffcult to achieve experimentally, while the existence
of others can only be inferred indirectly and uncertainly from experiment. |
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