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Showing 1 to 17 of 17 for “"Sheared flow"”.
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Acoustic Scattering in Sheared Flow
… the silent flight of owls, modification of the flow within the boundary-layer near the trailing-edge, either through passive or active devices, appears to offer methods of reducing far-field noise. The precise mechanisms are not completely understood, and this work focuses on the effect of …
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Experimental Investigation of Sheared Flow Stabilization of Z-pinches
… velocity shear predict that a supersonic axial flow with a radial gradient is capable of stabilizing the MHD instabilities [3][4][5]. A sheared flow can be introduced to a pinch by using a conical wire array with a fine metallic wire on axis [6]. The wire on axis will carry a fraction of the …
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Axial Evolution of a Sheared-Flow-Stabilized Z Pinch
The Fusion Z-pinch Experiment (FuZE) is a sheared-flow-stabilized Z pinch based on the ZaP and ZaP-HD experiments. The FuZE device generates neutron-producing, 50-cm-long Z pinches formed from plasma accelerated through coaxial electrodes. The Z pinches are sustained between a nose cone at the tip …
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Flow-induced vibration of a non-constant tension cable in a sheared flow
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1988.
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Effects of broad-banded higher harmonics on fatigue damage of risers due to vortex-induced vibrations
… data set. For test of a bare riser in uniform flow, the damage was increased by a factor of 2 when the higher harmonics of the signal were included and another factor of 2 when the broad-banded harmonics were included. Similar results were obtained for tests of the bare riser in sheared flow as …
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Application of ray acoustics to the propagation of sound in ducts containing sheared flows
… sound waves in a homogeneous moving medium with sheared flow bounded by the hard walls of a duct. Differential equations describing the ray trajectories and spreading losses along each ray were developed and solved numerically for a range of centerline Mach numbers and shear boundary-layers. …
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Using Machine Learning to Generate a Surrogate Model for Plasma-Surface Interactions
… the boundary of a five-moment simulation of the sheared-flow-stabilized (SFS) z-pinch fusion experiment at the University of Washington for graphite and tungsten walls. The trained network then approximates plasma-surface interactions for conditions relevant to the SFS z-pinch fusion experiment. …
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Learning hydrodynamic coefficient databases for vortex induced vibration prediction of marine risers using sparse sensor measurements
… is applied to a straight riser in uniform flow and extended to non-straight riser configurations and non-uniform incoming flow profiles. Moreover, database inference is extended to using direct sparse sensor measurements along the structure. Specifically, a 19-dimensional parametric …
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Measurements of Magnetic Compression and Melt of Electrically Thick Metals Driven by Lineal Current Densities Characteristic of Pulsed-Power-Driven Fusion Devices
… and radiative loss mechanisms. FuZE-Q employs sheared-flow to suppress disruptive instabilities and sustain quiescent plasma conditions. A recently developed extreme ultraviolet spectrometer diagnostic on FuZE-Q identified plasma impurities, providing data for radiative loss calculations. …
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Dynamics of Turbulence and Flows in a Helicon Plasma Under Electrode Biasing
… studies investigating turbulence, and sheared flow were carried out using the linear Helicon-Cathode (HelCat) device. Without any outside influence, such as biasing or momentum input, fluctuations were observed. The dynamics of these fluctuations was found to vary with magnetic field, …
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Impacts of channel curvature on drag, mixing, and stratification in estuaries
… and channel curvature can lead to distinct flow processes in bends, e.g., secondary circulation and flow separation. An integrated approach combining field observations, idealized modeling, and realistic modeling is used to understand how curvature-induced flow processes affect hydrodynamic …
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Impacts of Channel Curvature on Drag, Mixing, and Stratification in Estuaries
… and channel curvature can lead to distinct flow processes in bends, e.g., secondary circulation and flow separation. An integrated approach combining field observations, idealized modeling, and realistic modeling is used to understand how curvature-induced flow processes affect hydrodynamic …
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Prediction and control of sound propagation in turbofan engine bypass ducts
… of sound in acoustically lined ducts<br/>with flow. The motivation for this work is the requirement to predict the sound attenuation of<br/>acoustic liners in the bypass duct of modern turbofan aeroengines. The liners provide the most<br/>effective means with which to suppress the rear fan …
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Vortex shedding from a vibrating cable with attached spherical bodies in a linear shear flow
… instrument arrays. Consequently, the resonant flow-induced oscillation of these cables, caused by vortex shedding, is extremely undesirable because of the associated damaging phenomena. The present study, which employs hot wire anemometry as the principal investigative tool, was undertaken to …
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Dynamically induced uncertainty in stratified turbulent mixing models
… in a wide range of environmental and industrial flows. On both global and regional scales in the ocean, it is necessary to model small-scale turbulent processes and the way in which they enhance mixing in order to form an accurate picture of the vertical transport of heat, nutrients and …
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Bacteria in shear flow
… always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent flow in rivers, streams, lakes, and oceans, as well as anthropogenic habitats such as bioreactors, heat exchangers and water supply systems. The presence of flow not …