Browsing by Author "Hartfield, Roy"

Now showing items 1-20 of 54

3-D Visualization of a Zero-Pressure Gradient Turbulent Boundary Layer

Williams, Steven (2010-05-10)

The application of a novel technique for 3-D visualization of a zero-pressure gradient turbulent boundary layer is discussed. Measurements of a 1.65δ x 1.65δ x 1.65δ volume were taken at a flow speed of 96 ft/s, Reθ ~ 5900, ...

Accelerating Binary Genetic Algorithm Driven Missile Design Optimization Routine with a CUDA Coded Six Degrees-Of-Freedom Simulator

Benton, Daniel (2015-12-04)

Science and Engineering has benefited enormously from the advent of modern (digital) computing. As technology continues to grow, computation capability becomes exponentially faster, more reliable, and more efficient. While ...

Aerodynamic Analysis of a Morphing Wing Using Vorticity Based Solver

Sathe, Shivaranjani (2019-07-16)

This study addresses an efficient approach to analyzing Variable Camber continuous trailing edge flaps (VCCTEF) wings, which mimics the concept of morphing or shape changing wings. The validation model used in this research ...

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 Optimization of Integrated Wing-Engine Geometry Using an Unstructured Vorticity Solver

King, Logan (2015-05-29)

A high fidelity surface vorticity solver in conjunction with an optimizer is used to find optimal solutions for engine integration. The case study for this paper is an aerodynamically optimized engine configuration added ...

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 Wrap-Around Fins in Supersonic Flow

Wilks, Brett (2005-12-15)

Existing supersonic fin theory has been modified to compute the pressure distribution over a wrap-around fin. Evvard’s theory has been used to calculate the pressure loading due to angle-of-attack on a wrap-around fin by ...

Aerospace Design Optimization Using a Real Coded Genetic Algorithm

Dyer, John (2008-05-15)

This study demonstrates the advantages of using a real coded genetic algorithm (GA) for aerospace engineering design applications. A real coded GA was written from first principles for this study and the source code can ...

Application of the Discontinuous Galerkin Method to Wake Vortex Flows

Watson, Robert, III (2015-02-19)

A code was developed that utilizes the discontinuous Galerkin method to solve the Euler equations while utilizing a modal arti cial viscosity sensor developed by Klockner [12]. The sensor was augmented for the purpose ...

Automated Nozzle Design through Axis-Symmetric Method of Characteristics Coupled with Chemical Kinetics

Young, Reid (2012-05-10)

A method of designing axis-symmetric nozzles with included finite-rate chemical kinetics has been developed. The use of the axis-symmetric method of characteristics coupled with finite-rate chemistry allows for the design ...

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 ...

Civil UAV Type Certification: DoD Mishap Analysis 2000-2009 and FAA Certification Roadmap

Hundley, Joshua (2012-08-29)

The Federal Aviation Administration (FAA) has issued memorandums which support the use of flight activities which can demonstrate that proposed operation can be conducted at an acceptable level of safety. This paper ...

Close-Proximity Flight Validation Analysis with FlightStream

Owens, Taylor (2019-08-08)

The objective of this research is to validate the use of FlightStream® in accurately predicting aerodynamic loads in a scenario of close-proximity flight, such as an aerial refueling and formation flight environment. The ...

Computational Vorticoacoustic Stability Analysis of the Bidirectional Vortex Engine

Kovacic, Paul (2016-05-04)

Since the invention of combustion-based propulsion systems, the presence of resonating, broadband waves has often been associated with the onset of a phenomenon known as "combustion instability." These waves commonly take ...

Conceptual Design Optimization of an Augmented Stability Aircraft Incorporating Dynamic Response Performance Constraints

Welstead, Jason (2014-12-10)

This research focused on incorporating stability and control into a multidisciplinary design optimization on a Boeing 737-class advanced concept called the D8.2b. A new method of evaluating the aircraft handling performance ...

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 ...

Design and Testing of a Gas Distribution Method for Pulsed Inductive Thrusters

Miller, Robert (2008-12-15)

A gas distribution manifold for use in a Pulsed Inductive Thruster has been designed and tested. The Argon test gas is distributed radially outward over a flat disc from an enclosed manifold area. The manifold was designed ...

Design Optimization of Space Launch Vehicles Using a Genetic Algorithm

Bayley, Douglas (2007-08-15)

The United States Air Force (USAF) continues to have a need for assured access to space. In addition to flexible and responsive spacelift, a reduction in the cost per launch of space launch vehicles is also desirable. ...

Determination of Key Parameters for Reverse Engineering Solid Rocket Powered Missiles

Metts, Jonathan (2006-12-15)

This thesis examines the process of reverse engineering solid rocket powered missiles using legacy codes and a genetic algorithm (GA). Available data for reverse engineering problems might include performance characteristics ...

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) ...