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Driving Flows in Laboratory Astrophysical Plasma Jets: The Mochi.LabJet Experiment
Mochi.Labjet is a new experiment at the University of Washington developed to investigate the interaction of shear flows in plasma jets with boundary conditions similar to an accretion disc system. This thesis details the engineering design and first plasmas of the Mochi.Labjet experiment. The experiment required construction ...
Initiation of Orderly Spinning Detonation Waves via Phased Sparking
A Continuous Rotating Detonation Engine (CRDE) was tested with two unique features. First, the conventional pre-detonator was replaced by a novel detonation wave generator. This generator sequentially fired spark plugs at a speed near the acoustic speed of a reactant gas mixture thereby producing free radicals ready to partake ...
Acoustic Emission Beamforming for Detection and Localization of Damage
The aerospace industry is a constantly evolving field with corporate manufacturers continually utilizing innovative processes and materials. These materials include advanced metallics and composite systems. The exploration and implementation of new materials and structures has prompted the development of numerous structural ...
A Three-Dimensional Particle Tracking Velocimetry System for the Evaluation of Large-Eddy Simulation Turbulence Models
The necessity for evaluating the accuracy and characteristics of new Large-Eddy Simulation (LES) turbulence models in modern fluid mechanics research has inspired the development of a Three-Dimensional Particle Tracking Velocimetry (3DPTV) system capable of producing 3-Dimension 3-Component (3D3C) velocity vector fields. The ...
Single-Element Characterization of the LS-DYNA MAT54 Material Model
(2013-04-17)
Research was completed to characterize the root behavior of the LS-DYNA MAT54 composite orthotropic material model. This primarily involved investigating the constitutive relations, ply failure (damage onset), ply deletion, damage factors, and element deletion. A single shell element under uniaxial tensile and compressive ...
Nonlinear Aeroelastic Behavior of Tail / Rudder Systems with Freeplay and Actuator Failure
(2013-07-25)
This thesis discusses the development of numerical simulations implemented in MATLAB and of an experimental tail/rudder model for the investigation of the effects of non-linearities on control surface flutter of a three-degree of freedom typical section airfoil. Non-linearities investigated include a structural non-linearity ...
Cosine Kuramoto Based Distribution of a Convoy with Limit-Cycle Obstacle Avoidance Through the Use of Simulated Agents
This thesis presents a method for the integration of complex network control algorithms with localized agent specific algorithms for maneuvering and obstacle avoidance. This method allows for successful implementation of group and agent specific behaviors. It has proven to be robust and will work for a variety of vehicle ...
Characterization of Wall Shear Stress of Underexpanded Impinging Jets
Wall shear stress is characterized for underexpanded axisymmetric impinging jets for the application of aerodynamic particle resuspension from a surface. Analysis of the flow field resulting from normally impinging jets is conducted using Computational Fluid Dynamics. A normally impinging jet is modeled, considering a large ...
Vortex detection through pressure measurements
Vortex Generators (VGs) are known to hinder boundary layer separation, a frequently unwanted phenomenon when it comes to external flows over aircraft wings, on-ground vehicles or internal flows within pipes, diffusers and turbomachinery. Boundary layer separation leads to loss of lift, higher drag and subsequently, energy ...
A Wall Model for Large-Eddy Simulation of Compressible Channel Flows
A wall model for the large-eddy simulation (LES) of compressible channel flows with isothermal walls is presented, which extends the incompressible model of Chung and Pullin (Journal of Fluid Mechanics, 2009). The wall model computes the local, instantaneous wall shear stress and heat flux, which are then applied as wall ...