Government institutions are responsible for providing services to their citizens. However, these public organizations face great uncertainty in both their internal and external environment that can affect citizen client outcomes. Through a series of empirical tests, this dissert…
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The wakes formed behind four different flat plates have been investigated experimentally and numerically. One of the plates (called plate 1) had rectangular shape while the rest were made to have varying trailing edge in the spanwise direction in order to introduce three-dimensi…
This thesis describes methodologies to evaluate the performance and to assess the uncertainty of atmospheric dispersion models, tools that predict the fate of gases and aerosols upon their release into the atmosphere. Because of the large economic and public-health impacts often…
An experimental study was made to obtain heat transfer data for two-pass square and rectangular channels with smooth and ribbed surfaces for two channel orientations (90° and 135° to the direction of rotational plane). In the two-pass square channel, ribs were placed on the lead…
The fluid flow patterns in a paper-machine headbox have a strong influence on the quality of the paper produced by the machine. Due to increasing demand for high quality paper there is a need to investigate the details of the fluid flow in the paper machine headbox. The objectiv…
Currently environmental concerns are driving internal combustion engine manufacturers to seek greater fuel efficiency, more refinement and lower emissions. Cyclic variation is a known obstacle to achieving the greatest potential against these goals and therefore an understanding…
This thesis contains a thorough investigation of the properties of freely decaying turbulence in a rotating shallow water layer on a sphere. A large number of simulations, covering an extensive range of Froude and Rossby numbers, have been carried out using a novel numerical alg…
Large Eddy Simulation is a method of obtaining high accuracy computational results for modelling fluid flow. Unfortunately it is computationally expensive limiting it to users of large parallel machines. However, it may be that the use of LES leads to an over-resolution of the p…
The complicated turbulence structures in wall-bounded flows require accurate subgrid scale, SGS, modelling and realistic inlet boundary conditions for Large Eddy Simulation, LES. The present study focused on the investigation and development of transport equation SGS models and …
Thermoacoustic devices are a group of systems that make use of the thermoacoustic effect to achieve an energy conversion between thermal and acoustic energy. The thermoacoustic effect occurs when a solid boundary is introduced into an acoustic field, and a non-zero net heat tran…
The focus of this thesis is the study of turbulent solid-liquid stirred suspensions, which are involved in many common unit operations in the chemical, pharmaceutical and food industries. The studies of two-phase flows present a big challenge to researchers due to the complexity…
This thesis aims to answer the question, “What physical process dominates the formation of plasma irregularities, capable of directly or indirectly causing GPS L1 band scintillation, in polar cap plasma patches during magnetic storm conditions?.” A novel modelling technique util…
The issue of the effects of free stream turbulence on the flow field over a surface-mounted prism is examined through experimental and numerical investigations. In the experimental studies, particle image velocimetry measurements are conducted in the ESM water tunnel at Reynolds…
This thesis investigates the effects of pressure gradient and roughness on the mean and turbulence characteristics in non-uniform open channel flow. The flow and turbulence structure over three successive beds with accelerating, near uniform (near zero pressure gradient) and dec…
Indian River Inlet (IRI), DE, USA, is located at roughly the midpoint of ~ 40 km Atlantic coast of Delaware and is the major waterway that connects the Atlantic Ocean to two Delaware inland bays. Twin jetties constructed in late 1930s to keep the inlet from filling also interrup…
In order to design next generation gas turbine combustor and rocket engines, a systematic study of flame structure at high intensity turbulent flow is necessary. The fundamental study of turbulent premixed combustion has been a major research concern for decades. The work is foc…
The demand on Unmanned Aerial Vehicles (UAVs) for execution of combat, surveillance and reconnaissance missions have increased greatly across the world henceforth modeling and simulation of aircraft systems are necessary to eliminate unnecessary costs. In this work a longitudina…