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 20 of 134 for “"Velocity fields"”.
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Experimental Investigation of Acceleration and Velocity Fields in Turbulent Channel Flow
The velocity time derivatives are associated predominantly with small scales in both space and time. Examination of instantaneous and estimates of the conditionally averaged velocity time-derivative fields indicates that the smaller-scale vortices leave a convective imprint upon the time …
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Visualization of scalar velocity fields over one- and two-dimensional structures
Visualization techniques for representing scalar velocity fields over one- and two dimensional vibrating structures are investigated. High spatial density velocity fields are measured over a vibrating beam and a vibrating plate by a scanning laser velocimeter. The velocity measurements are assumed …
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Pressure and velocity fields in a relaxing three-dimensional turbulent boundary layer
Static pressure and mean velocity data were obtained in a relaxing shear driven three-dimensional incompressible turbulent boundary layer flow produced by a swept rectangular step. The nominally 10 cm (4 in.) thick boundary layer had a freestream velocity of approximately 25 m/sec (80 ft/sec). The …
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A comparison of the velocity fields associated with vorticities of three different origins
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Concentration And Velocity Fields Throughout The Flow Field Of Swirling Flows In Gas Turbine Mixers
Air velocity and fuel concentration data have been collected throughout the flow fields of two gas turbine mixers in an effort to better understand the mixing of fuel and air in gas turbine mixers. The two gas turbine mixers consisted of an annular flow profile and incorporated swirl vanes to …
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Fluctuating Pressure and Velocity Fields in the Near Field of a Round Jet (Turbulent, Shear Layer, Triple-Wire, Self-Preserving, Hot)
… inclined to the flow vector is adopted. Inverted velocity vectors are multiple but a uniqueness domain, within which the vector coinciding with the true velocity vector can be singled out, is defined. Samples of linearized voltages were taken in the turbulent shear layer of a 6.35 cm diameter jet …
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Velocity Measurements for Turbulent Nonseparated Flow Over Solid Waves
… measurements have been made of nonseparated velocity fields over solid sinusoidal wavy surfaces. Time-averaged velocity and turbulent intensity data are given.
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A Semi-Analytical Line Transfer (SALT) Model For Bi-conical Galactic Outflows
… sight to the observer, as well as generalized velocity fields. We model the absorption and emission component of the line profile resulting from resonant absorption in the bi-conical outflow. We show how the outflow geometry impacts the resulting line profile. We use simulated spectra with …
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Quantitative imaging of the air-water flow fields formed by unsteady breaking waves
… method for simultaneously measuring the velocity fields on the air and water side of unsteady breaking waves is presented. The method is applied to breaking waves to investigate the physics of the air and water flow fields to further our knowledge of the impact of wave breaking on air-sea …
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The development of a systematic experimental method for damage identification
… and the structures. Then the tests of the velocity fields at some specified frequencies are performed to acquire dynamic response data of the objects for the study purposes. A systematic method to process the experimental data has been developed first in this thesis. The best regressive …
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The Two Point Correlation Structure of a Cylinder Wake
… to compute the average instantaneous velocity fields of both wake flows. These velocity fields represent the average eddy structures present in each wake flow. The eddy structure comparisons show that the structures in the cylinder wake are larger and better correlated at longer time …
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Investigation of turbulent boundary layer structure using particle image velocimetry
… (PIV) is used to measure instantaneous velocity fields in the streamwise wall-normal plane of a zero-pressure-gradient turbulent boundary layer. In total, 340 PIV realizations of the boundary layer were obtained at Reynolds numbers based on momentum thickness of Ree = 930, 2370 and 6845. …
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An Experimental Evaluation of the Experimental Spatial Dynamics Modeling (ESDM) Technique
… vibrometer (LDV). A scanning LDV can measure velocity at many structure locations. An important new technique, Experimental Spatial Dynamics Modeling (ESDM), utilizes such spatially dense velocity data. ESDM models continuous, three-dimensional velocity fields using LDV velocity data. Thus, …
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Gaseous Reactive Flows Around Catalytically Combusting Micro-Wires
… that controlled temperature, composition and velocity of the reactant-air pre-mixture. The results highlight the combined importance of both surface chemistry and transport phenomena for the determination of the structure of these flow fields. Specifically, the temperature of the catalytic …
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Current Land Subsidence And Fault Movement In The Long Point Fault Area
… for full-record and recent-period (2018-2026) velocity estimates and compared against the 2013-2018 baseline established by Liu et al. (2019). LiCSBAS-derived InSAR vertical and EW horizontal velocity fields for the 2017-2025 period were anchored to GOM25 GPS velocities, providing spatially …
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Initial Conditions and Collapse of Prestellar Cores
… are created by the interaction of a turbulent velocity field and gravity. On large scales turbulence supports molecular clouds against gravity. But on small scales turbulence is able to create dense structures by locally converging flows. Eventually these structures may be captured by their own …
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Measurements in a compressible planar shear layer with a thermal gradient
… capacities of the facility. Three-component velocity fields along the central streamwise-transverse plane of the shear layer were obtained through the use of stereo-particle image velocimetry. Even with the novel stagnation temperature gradient, it was found that there were minor to …
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UAV-based investigations into the hydrology and dynamics of the Greenland Ice Sheet
… a low- cost UAV suitable for deriving ice sheet velocity fields from Structure-from-Motion photogrammetry. In order to geolocate products without using ground control, image locations are determined directly using an on-board L1 GNSS receiver. I validate this method, showing that accuracies are …
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The study of pedestrian level wind at MacGregor dormitory building
… 40 degrees) relative to the front of the model. Velocity measurements were taken at 16 different grid points, and a standard smoke experiment was done to visualize flow directions around the corner. Velocity fields were plotted and normalized across the different grid points. Both magnitudes and …
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Unsteady pressure and vorticity fields in blade-vortex interactions
… take data in a water tunnel. Ensemble-averaged velocity fields are obtained in the region of the leading edge of the airfoil. Finite-difference algorithms were written to obtain vorticity and pressure in the data field. Computer animation of the unsteady vorticity was accomplished first with a …
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