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Showing 1 to 20 of 194 for “"wakes"”.
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Turbulent wakes in turbulent streams
… free-stream turbulence on axisymmetric wakes. In both cases the wake was introduced to<br/>various turbulent streams having various levels of turbulence intensity and length scales. It<br/>was found that the presence of the free-stream turbulence changes the wake’s decay rate …
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Cubesat Wakes in the Earth’s Ionosphere
… surface charging, plasma sheaths and wakes- have been well-studied for larger satellites, they are less understood for CubeSats.</p> <p>The Dynamic Ionosphere CubeSat Experiment (DICE) is a 1.5U CubeSat which recently ended its mission. DICE carried two fixed-bias Langmuir probes …
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Rotor Wakes; Formations, Interactions, and Design
… the fundamental flow physics of rotor wakes and presents a rotor design methodology that enables the creation of mission-tailored wakes for improved aero-propulsive integration. These goals are addressed through a series of experimental campaigns involving both ducted and unducted …
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Complex Equilibrium of Laterally Curved Wakes
Turbulent wakes generated from an aircraft or submarine vehicles has been of main interest to researchers due to the broad band noise associated with such wakes. One such case is the noise generated by spiral vortices shed of from one blade interacting with another oncoming blade of helicopter …
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Three-dimensional wakes in linearly stratified liquids.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1966. M.S.
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Separation and wakes over three-dimensional bodies
The laminar flow over a prolate spheroid was investigated via flow visualization and Laser-Doppler Velocimetry. Experiments were conducted in a water tunnel and the flow was visualized with dyes. The measurement of three-dimensional boundary layers required a special design of the laser optics. …
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Structure and Persistence of Surface Ship Wakes
It has long been known that ship wakes are observable by synthetic aperture radar. However, incomplete physical understanding has prevented the development of simulation tools that can predict both the structure and persistence of wakes in the ocean environment. It is the focus of this work to …
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The turbulence structure of trailing vortex wakes
The present investigation is a two-part study of the mean flow and turbulence structure of isolated vortices and counter-rotating vortex pairs. In the first part, the turbulence structure of an isolated vortex was studied using three-component velocity measurements. Vortices were generated using …
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Kinetic electron phenomena in dense magnetized plasma wakes
… electron effects also impact the stability of wakes at slower flow. It is found that kinetic electrons do trigger disruption of the ion beams in the wake, as in the (supersonic) 1D simulations, but the hole-growth phenomenon cannot be conclusively implicated because a highly artificial electron …
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The simulation of surface ship micro-bubble wakes
A method in which the transport and evolution of the bubble population in a surface ship wake is numerically simulated is presented. The simulation is accomplished by constructing an advective-diffusive transport model for the scalar bubble field and solving this model for late times after ship …
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Bi-stability in the Wakes of Platooning Ahmed Bodies
<p>Autonomous heavy vehicles will enable the promise of decreased energy consumption through the ability to platoon in closer formation than is currently safe or legal. It is therefore increasingly important to understand the complex and dynamic wake interactions between vehicles operating in close …
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Wake Survey Techniques for Objects With Highly Turbulent Wakes
… the drag of objects with highly turbulent wakes were recommended.
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Boundary integral methods for lifting bodies with vortex wakes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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A modified Baldwin-Lomax turbulence model for turbomachinery wakes
… reversed flow, and curved, asymmetric wakes is made. No general definition for reference line is available for wakes, and difficulties exist for length scale prediction in complex flows. An entropy envelope for shear layers, and the locus of maximum entropy to define the wake centerline …
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Large eddy simulations of bluff-body wakes on parallel computers
… to predict the characteristics of turbulent wakes of bluff bodies. The problem considered concerns turbulent flow over a square cylinder placed normal to a uniform free stream. The Reynolds number selected for the simulations is 21,400 where detailed experimental data are available. The …
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Aerodynamic response of turbomachinery blade rows to convecting density wakes
Density wakes have been recently identified as a possible new source for high cycle fatigue failure in the compressor blades of modern turbomachinery. In order to characterize the density wake induced force and moment fluctuations in compressor blades a two-dimensional computational study has been …
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Dynamics of vortices in complex wakes: modeling, analysis, and experiments
… mathematical models for complex laminar wakes which are formed behind vortex-shedding bluff bodies. These wake structures exhibit a variety of patterns as the bodies oscillate or are in close proximity of one another. The most well-known formation comprises two counter-rotating vortices …
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Anisotropic Turbulence Models for Wakes in an Active Ocean Environment
… and against previous experimental study of wakes subjected to a density stratification. The turbulence models are found to reproduce a number of important behaviors which differentiate stratified wakes from those in a homogeneous environment, including the appropriate decay rates in …
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Investigation on the Interaction of an Impinging Jet with Cylinder Wakes
… The flow feature analysis concluded the cylinder wakes deformed the jet core inducing lateral and angular oscillations. The heat transfer results showed the Nusselt number is proportional to the velocity ratio for oscillating jet cases. The non-oscillating jet enhances the heat transfer rate by …
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Time -Resolved Visualization and Analysis of Compressible Blunt -Base Cylinder Wakes
High-speed flow visualization of these wakes is also performed. Both conventional cross-correlation analysis and cross-correlation analysis conditioned on the coherent structures are performed to measure the convection velocity of the coherent structures. The coherent structures in the developing …
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