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Self Rotating Life Forms, Mechanical Connections and Simulation of Deformable Bodies in Inviscid Flow.

Douglas, Natalie. (2011) Self Rotating Life Forms, Mechanical Connections and Simulation of Deformable Bodies in Inviscid Flow. Doctoral thesis, University of Surrey (United Kingdom)..

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Abstract

It is seen in some natural biological situations, that a living organism requiring a change in its location and orientation is able to do so by executing a sequence of internally controlled motions. These motions cause a resultant location change due to the conservation of momentum. The first half of this study investigates various entities which have control of an internal configuration which when changed result in a change in external configuration; the 2-D diver, the falling cat, the astronaut and the falling gecko. The relationship between changes in the base space (internal configuration) and the location group (resultant external configuration) can be represented as a momentum-preserving connection on a principal fibre bundle. The second half of this study investigates the possibility of adapting a numerical panel method, used to model flow past an aircraft aerofoil, to the notion of a deformable 2-dimensional body submerged in an ideal, irrotational, quiescent fluid. The method is designed to model the movement of an amoeboid swimmer, such as the unicellular Synechoccocus genus, through a quiescent fluid. It is shown that the amoeba, which changes its surface shape, experiences a change in location within the fluid, including rotational and translational changes, due to the conservation of linear and angular momentum. We present a model for unicellular fluid transport using the connection associated with a panelled-surface approximation of the body. It is found that the model proposed was a reasonable, low-error, representation when compared with an analytical model for a particular type of small deformation. The model also caters for a wider range of deformations and extension to a higher-dimensional base space.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors : Douglas, Natalie.
Date : 2011
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 2011.
Depositing User : EPrints Services
Date Deposited : 24 Apr 2020 15:26
Last Modified : 24 Apr 2020 15:26
URI: http://epubs.surrey.ac.uk/id/eprint/854997

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