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Title: On fluid-body and fluid-network interactions
Author: Balta, Samire
ISNI:       0000 0004 7228 8314
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2017
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The thesis presents a study of dynamically coupled fluid-body and fluid-network interactions. The aim is to develop mathematical models and address certain problems regarding the interaction between solid and surrounding fluid as well as solid and solid and flow in branching networks. Three general configurations of the interaction are considered. First, a rigid body surrounded by a fluid in a channel is studied. Second, lift-off of a rigid body in flow is examined. Third, fluid dynamical networks with multiple branching and reconnections are investigated. Regarding the first configuration, the prime concerns are with the effects of a time dependent indentation, as the body travels through, and with the effects of a flexible patch of containing wall. Early-time responses examined analytically show the gradually growing influence from the distortion of the walls. Ensuing finite-time clashing of the body with the channel walls and the properties of the unsteady nonlinear wake behind this body are also investigated. In the second configuration, we investigate criteria for lift-off of a thin solid body from the surface and the ensuing unsteady two-dimensional motion. The body can either lift off and fly away or return to the surface in a finite time. A critical value for fly-away is found. In reference to the third configuration, control of the internal flow networks by virtue of the outer end pressures is investigated together with effects from the individual vessel shapes and lengths. A single nonlinear evolution equation is derived rationally which within a certain range admits the influence of all the end pressures as well as the overall features of vessel shape and determines the flow through the whole network.
Supervisor: Smith, F. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available