Browsing by Author "Ahmed, Anwar"

Now showing items 1-20 of 31

Aerodynamic loads and flow structures on a simultaneously rotating and pitching flat plate

Qamar, Muhammad Shahan (2023-12-04) ETD File Embargoed

Unsteady flow separation and leading-edge vortices (LEV) profoundly impact the aerodynamics of insect wings, helicopter rotor blades, and similar systems. The dynamics of such systems depend on wing pitch rate and pivot ...

Aerodynamic Optimization for Freight Trucks Using a Genetic Algorithm and CFD

Doyle, Joshua (2007-12-15)

A computational fluid dynamics (CFD) code is being combined with a genetic algorithm (GA) to perform a two-dimensional drag minimization study on tractor trailers. This paper involves the minimization of drag on two different ...

Aerodynamic Testing of a Circular Planform Concept Aircraft

Recktenwald, Bryan (2008-08-15)

Auburn University has entered into collaboration with Geobat Flying Saucer Aviation Inc. for aerodynamic and flow visualization studies of the Geobat aircraft. The aircraft model that was tested consisted of a circular ...

Aerodynamics of Wings in Tandem at Low Reynolds Numbers

Shah, Syed Hassan Raza (2023-12-07) ETD File Embargoed

The aerodynamic interactions between two wings of NACA0012 section arranged in tandem configuration were experimentally investigated at low Reynolds number of 20,000 and 100,000 in the wind tunnel and water tunnel. The ...

Carbohydrate Nanoparticles: A Novel Drug Delivery Platform for the Systemic Route

Basu, Sarkar (2006-12-15)

With the phenomenal developments in the fields of biotechnology and molecular biology, the focus in the medical fraternity is shifting towards cellular level intervention. The use of polypeptides, proteins and possibly ...

Characterization of Swirl-Driven Hybrid Rocket Engines

Marquardt, Timothy (2020-11-03) ETD File Embargoed

Although hybrid rockets offer several potential benefits in terms of safety and performance, their use has mostly been limited to lab-scale motors and academic settings. Foremost among the factors contributing to this ...

Computational Fluid Dynamics Simulation Of Chemically Reacting Gas Flows Through Microfibrous Materials

Duggirala, Ravi (2008-05-15)

This dissertation presents results of research efforts to propose a design space for new microfibrous materials with enhanced chemical reactivity with optimum pressure gradient. These microfibrous materials material are ...

Design and Construction of a Mach 2 Wind Tunnel For Cavity Acoustics Research

Davis, Brian (2013-04-17)

Cavity flow is encountered in many practical applications of ground and air vehicles operating at high speed. Examples include airflow past open windows, sunroofs, and wheel-wells of automobiles as well as landing gear and ...

Detached Eddy Simulations of a Simplified Tractor-Trailer Geometry

Ghuge, Harshavardhan (2007-05-15)

This thesis presents a comparison of the results from the Detached Eddy Simulation (DES) turbulence model used for modeling flow over a {1/8}$^{th}$ scale simplified model of a tractor-trailer geometry (or the Ground ...

Development of 3D Background Oriented Schlieren with a Plenoptic Camera

Bichal, Abhishek (2015-07-30)

This dissertation investigates a novel idea of implementing background oriented schlieren (BOS) with a plenoptic camera along with its application for 3-dimensional (3D) density measurement and for depth perception (DP) ...

Development of a Direct Density Measurement Technique for Aero-Optic Analysis of a High-Velocity, Compressible Flow Field

Reid, John (2011-04-28)

A direct density measurement technique was developed for high-velocity, compressible flow fields using acetone planar laser induced fluorescence (PLIF). Motivation for this work was mainly aero-optics. A 4” x 4” transonic ...

Development of a High Speed Three-dimensional Flow Visualization Technique

Satija, Aman (2007-12-15)

A high-speed three-dimensional flow visualization technique has been developed. The technique involves the generation of laser pulses at a high repetition rate, which are subsequently converted to sheets of light and ...

Discretization Error Estimation Using Method Of Nearby Problems: One-Dimensional Cases

Raju, Anil (2005-12-15)

Discretization error is defined as the difference between the solution of the discretized equation and the exact solution of the original partial differential equation. There are two main goals in this study. The first ...

Dynamics of Secondary Steady State Flows in a Combined Taylor-Couette and Escudier Vortex Breakdown Flow Field

Waldheim, Jordan (2022-05-10)

Effects of a varying height end-wall on the bifurcation and stability of secondary steady state flows within the annular gap of a Taylor-Couette cell were investigated. Experiments were conducted at four different end-wall ...

Effect of In Phase and Out of Phase Forcing on Circular Cylinder Wake

Moore, Michael Hayden, Jr. (2013-01-03)

Using periodic forcing, the control of instabilities in the wake of a circular cylinder was investigated. The cylinder model had two straight slits, one on each side, that were connected to separate low frequency and high ...

Effect of Random Noise and Gaussian Noise Forcing on the Wake of a Circular Cylinder

Gambhir, Venkat Praveen (2015-05-11)

Flow over a bluff body has been a topic of extensive investigation, due to a variety of engineering problems such as vortex induced vibrations, unsteady forces and noise associated with the periodic flow in the wake. The ...

Effect of three dimensional forcing on the wake of a circular cylinder

Bhattacharya, Samik (2009-08-03)

The periodic wake of a circular cylinder was investigated with a three dimensional disturbances,introduced in the flow field through two sinusoidal slits located on two diametrically opposite direction on the cylinder ...

End-Wall Flow of a Surface-Mounted Obstacle on a Convex Hump

Ahmed, Hamza (2009-11-18)

A convex hump has been used to overcome the undesirable effects of the juncture vortex. The effects of a convex hump on the approach boundary layer and consequentially the end-wall flow were quantified. A convex geometry ...

Experimental and Computational Investigation of a Turbofan Inlet Duct

Hall, Zachary (2009-11-20)

The flow field of an axisymmetric turbofan inlet was investigated experimentally and computationally. Flow visualization results were obtained using LIF, hydrogen bubbles, and PIV. Incidence angle was determined to be a ...

An Experimental Investigation of Confined Cyclonic Flows and Ensuing Jet

Khan, Omer (2021-05-03)

Confined cyclonic flows are being explored for their application in propulsion due to several advantages rendered by confined vortices which include, increased fuel residence time, turbulence, and propellant mixing, resulting ...