Browsing by Author "Hartfield, Roy J."

Now showing items 1-13 of 13

Aerodynamic loads over arbitrary bodies by method of integrated circulation

Ahuja, Vivek (2013-07-24)

A method for the application of vorticity based potential-flow solvers to unstructured surface meshes has been created. This method is designed to maintain the advantages of the vorticity based solvers while removing the ...

Ant Colony Optimization : An Alternative Heuristic for Aerospace Design Applications

Kiyak, Zachary (2014-01-09)

A modified ant colony optimization (ACO) algorithm is applied to a set of solid-rocket-motor and single-stage solid missile design problems. A local search procedure is also integrated with the algorithm, adding a search ...

Characterization of High Speed and Arbitrary Headwall Injection Effects on the Trkalian Swirling Mean Flowfield in Rocket Motors

Cecil, Orie (2016-07-28)

In this work, the bulk gaseous motion inside cylindrical chambers driven by wall normal injection with and without reactive headwalls is explored. The base model is of the Trkalian type and is here extended to include ...

A Comparison of Artificial Viscosity Sensors for the Discontinuous Galerkin Method

Favors, Joshua (2013-08-20)

The following work focuses on the development of an explicit Runge-Kutta, discontinuous Galerkin finite element method for the nonlinear, hyperbolic Euler equations. The discontinuous Galerkin method is a control-volume ...

Design Tool Development for Liquid Propellant Missile Systems

Riddle, David (2007-05-15)

The use of computer programs driven by genetic algorithms (GA’s) has become an increasingly popular method of optimizing engineering designs. This thesis focuses on the modeling and optimization of liquid rocket engine ...

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 ...

An Empirical and Computational Investigation into the Acoustical Environment at the Launch of a Space Vehicle

Smith, Wesley, III (2013-12-04)

During the launch of a space vehicle, the intense sound pressure levels created around the vehicle can excite the vehicle itself, payload, launch tower, and ground support systems into hazardous and potentially damaging ...

An Examination of MHz Rate PIV in a Heated Supersonic Jet

Brock, Bryan (2014-07-29)

An experimental investigation of a high temperature, supersonic jet conducted at the University of Mississippi's National Center for Physical Acoustics is described. Time-resolved particle image velocimetry (PIV) was used ...

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 ...

Failure Evasion: Statistically Solving the NP Complete Problem of Testing Difficult-to-Detect Faults

Venkatasubramanian, Muralidharan (2016-12-08)

A circuit with n primary inputs (PIs) has N = 2n possible input vectors. A test vector to correctly detect a fault in that circuit must be among those 2n n-bit combinations. Clearly, this problem can be rephrased as a ...

Integration of Grid Fins for the Optimal Design of Missile Systems

Ledlow, Timothy, II (2014-05-02)

Grid fins are unconventional missile control and stabilization devices that produce unique aerodynamic characteristics that are vastly different from that of the conventional planar fin. History has shown that grid fins ...

Rapid Missile System Characterization Using Computational Intelligence

Ritz, Steven (2014-05-15)

There exist many physical relationships between dynamic systems that humans can infer data from where an exact science may not be possible or plausible to apply. The imprecision or inaccuracy of attempted models and ...

Resolution and Boundary Placement Effects on Discontinuous Galerkin Simulations of Counter-rotating Vortex Interaction in a Confined Domain

Reitz, Rachel (2013-11-08)

The wakes of fixed-wing and rotary-wing aircraft present some of the most complex and challenging problems for numerical simulation, as fully capturing the interaction of the various vortices and coherent structures requires ...