Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"velocity correlation"”.
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Velocity characteristics in the wake of an oscillating cylinder
… anemometers is employed to study the spanwise velocity correlation and the vertical velocity profile downstream of a vibrating cylinder. Experiments involve either free vibration implemented through a force feedback system or forced sinusoidal motion. All experiments are conducted at a towing …
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Anomalous transport through porous and fractured media
… from the intermittent structure of the velocity field at the pore scale, which in turn emanates from the interplay between velocity heterogeneity and velocity correlation. Finally, we propose a continuous time random walk (CTRW) model that honors this intermittent structure at the pore …
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The drying and curing of yellow leaf tobacco by air conditioning methods
… of temperature, relative humidity, and air velocity. Correlation of these curing curves indicate the narrow limits of the conditions required for satisfactory curing, and the critical points beyond which resulted in poorly cured tobacco. From the results obtained, air conditioning improves …
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Autonomous Underwater Vehicle (AUV) path planning and adaptive on-board routing for adaptive rapid environmental assessment
… Shortest Path problem. However, due to the sound velocity correlation effect, the size of this problem can be very large. A method is developed to simplify the graph for a fast solution. As a significant step, a linear approximation for acoustic Transmission Loss (TL) is investigated numerically …
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Rotor Inflow Noise Caused by a Boundary Layer: Inflow Measurements and Noise Predictions
… unwanted noise and vibration. Two point velocity fluctuations were measured in detail to determine the full four-dimensional correlation function of a boundary layer generated over a smooth wall in the Virginia Tech Stability Wind Tunnel. The correlation function reveals anisotropy in the …
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Formation and Development of the Tip Leakage Vortex in a Simulated Axial Compressor with Unsteady Inflow
… was investigated through three-component mean velocity and turbulence distributions measured by four-sensor hotwires. Besides time-averaged data, the measurements were processed for phase-locked analysis, with respect to pitchwise locations of the vortex generators relative to the blade …
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A study of Taylor bubbles in vertical and inclined slug flow using multiphase CFD with level set
… analysis has determined that Taylor bubble velocity in slug flow is one such closure relation which significantly affects the calculation of these parameters. The main objective is to develop a unified higher-fidelity closure relation for Taylor bubble velocity. Here, we employ a novel …
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Prediction of Trailing Edge Noise from Two-Point Velocity Correlations
… by the integral of the cross product between the velocity and vorticity fields, of the boundary layer and shed vorticity (Howe (1978)). To extract the source terms, proper orthogonal decomposition is applied to the velocity cross spectrum to extract modes of the unsteady velocity and vorticity. …
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Time Series Analysis of the A0 Supergiant HR 1040
… a highly variable stellar wind including High Velocity Absorption (HVA) events. The star was found to have an active phase with large variation in the physical characteristics of the windand with the potential for HVAs. During the active phase, correlation between the H¿¿ absorption equivalent …
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Modifications of Coherent Structures in Fan Blade Wakes for Broadband Noise Reduction
… noise. Single and three-component hotwire velocity measurements were made downstream of the cascade for a chord Reynolds number of 390,000 and a Mach number of 0.07. Measurements of the two-point velocity correlation were used extensively to evaluate the impact of various flow control …
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Striatal Microcircuits Underlying Control of Actions
… is that we can arbitrarily vary movement velocity, defined as the rate of change in body configurations. Despite extensive studies that have attempted to elucidate the relationship between neurons in the dorsal striatum and movement, the mechanism of how striatal activity in the dorsal …
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Subtidal cross-shelf circulation on the Northern California shelf
… circulation, and the spatial scales of subtidal velocity. Mean and fluctuating heat and salt balances estimated between December, 1988 and May, 1989 demonstrate the importance of cross-shelf fluxes and their general consistency with the simple conceptual model. Mean fluxes are consistent with the …