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Fluid flow effects on objects with a dimpled surface

Brown, Sean (2015). Fluid flow effects on objects with a dimpled surface. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Brown, Sean
Title Fluid flow effects on objects with a dimpled surface
Institution Charles Darwin University
Publication Date 2015
Thesis Type Bachelor of Engineering (4th Year Project)
Subjects 0913 - Mechanical Engineering
Abstract This thesis investigates the fluid flow effects of geometries with a dimpled surface as compared to smooth surfaces. Geometries studied include cylinders, pointed orgives and streamlined bodies. The surfaces of the geometries studied have an array of evenly spaced dimples with specific dimensional properties to achieve a reduction in total drag forces exerted by fluid flow. Computational Fluid Dynamic flow simulations were conducted to observe boundary layer initiation and development along each object profile and drag forces experienced at speeds ranging from 5m/s to 40m/s. Along with the computed analysis, wind tunnel testing was conducted to observe real time boundary layer formation and drag forces resulting from wind speeds of the same range over geometry models. For visualisation in wind tunnel testing a smoke wand was utilised to demonstrate fluid flow over each model. Drag data was collected from surface integration calculations produced in CFD testing and from force gauges in wind tunnel testing. All results were compared with the performance of smooth surfaced models of the same geometry to observe the effects of the dimpled surface application.

Predominantly the investigation of this thesis is to experimentally determine whether or not the drag forces are either increased or diminished due to the dimpled surface texture.
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Created: Fri, 23 Oct 2015, 16:25:57 CST by Jessie Ng