Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence

Kelson, Neil (2000) Study of industrially relevant boundary layer and axisymmetric flows, including swirl and turbulence. PhD thesis, Queensland University of Technology.

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Micropolar and RNG-based modelling of industrially relevant boundary layer and recirculating swirling flows is described. Both models contain a number of adjustable parameters and auxiliary conditions that must be either modelled or experimentally determined, and the effects of varying these on the resulting flow solutions is quantified. To these ends, the behaviour of the micropolar model for self-similar flow over a surface that is both stretching and transpiring is explored in depth. The simplified governing equations permit both analytic and numerical approaches to be adopted, and a number of closed form solutions (both exact and approximate) are obtained using perturbation and order of magnitude analyses. Results are compared with the corresponding Newtonian flow solution in order to highlight the differences between the micropolar and classical models, and significant new insights into the behaviour of the micropolar model are revealed for this flow. The behaviour of the RNG-bas based models for swirling flow with vortex breakdown zones is explored in depth via computational modelling of two experimental data sets and an idealised breakdown flow configuration. Meticulous modeling of upstream auxillary conditions is required to correctly assess the behavior of the models studied in this work. The novel concept of using the results to infer the role of turbulence in the onset and topology of the breakdown zone is employed.

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ID Code: 37083
Item Type: QUT Thesis (PhD)
Additional Information: Presented to the School of Mathematical Sciences, Queensland University of Technology.
Keywords: Boundary layer, Fluid dynamics, micropolar flow, renormalisation group theory, similarity solutions, boundary layer, pertubation analysis, newtonian flow, swirling flow, turbulence model, vortex breakdown, computational fluid dynamics, thesis, doctoral
Institution: Queensland University of Technology
Copyright Owner: Copyright Neil Kelson
Deposited On: 22 Sep 2010 13:07
Last Modified: 24 May 2016 05:09

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