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Showing 1 to 20 of 108 for “"high Reynolds number"”.
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High Reynolds Number Unsteady Thermal Convection in a Shallow Layer
… The observed mean flow, which was embedded in a highly turbulent environment, had a symmetric profile about the center, similar to the flow pattern of inclined laminar convection; however, its intensity did not decrease following a sine relation. The joint moments of turbulent temperature, …
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Particle Dynamics in Inhomogeneous Flow at Moderate to High Reynolds Number
… complex inhomogeneous flows at moderate particle Reynolds numbers (Re = 10--600), we develop a DNS technique that resolves the smallest scales in the ambient flow and in the particle wake, and provides detailed microscale information on flow-particle interaction. We address the following sequence …
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Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows
… The transverse jet vorticity dynamics at high Reynolds numbers are first described, and more specifically the unsteady interactions between the wall boundary layer and the jet. We then present actuation strategies that manipulate the jet penetration and spread via simple nozzle-edge …
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CFD simulation of long slender offshore structures at high Reynolds number
… experimentally and numerically especially at low Reynolds number. However, many questions remain unanswered in detail regarding the effects of high Re on structural responses and fluid-structure interaction (FSI) phenomena such as lock-in for different design configurations. Furthermore, under …
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Blade tonal noise reduction using tail articulation at high Reynolds number
… in freestream velocities corresponding to Reynolds number in the range 75,000 < Re < 300,000 and (ii) operate at frequencies up to 30 Hz in order to investigate the range of Strouhal number 0.0 < St < 0.35. Velocity measurements in the active stator wake are carried out by Laser Doppler …
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Compressible turbulence in a high-speed high Reynolds number mixing layer
Compressible turbulence in a high-speed, high Reynolds number, supersonic free shear layer was studied. A two-dimensional free mixing layer was chosen to study turbulence rather than a wall bounded flow due to the experimental fact that the effects of compressibility become significant at lower …
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Aerodynamic drag on deformable and active structures in high Reynolds number conditions
… behavior of deformable structures, at high Reynolds numbers. We first introduce a novel mechanism to control the aerodynamic drag on cylinders, in the critical Reynolds number regime. We created both axially grooved and dimpled specimens, comprised of latex membranes stretched over …
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The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum
… Tunnel to perform experiments on a series of high Reynolds number zero pressure gradient turbulent boundary layers formed over rough walls in an effort to better understand and characterize the behavior of the rough wall pressure spectrum. The boundary layers were fully rough, and the boundary …
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High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps
… ratio of approximately 3.8%, 15% and 60% and Reynolds number based on step height ranging from 6640 to 213,000. The measurements included mean wall pressure, single and 2 point wall pressure fluctuations, single and 2 point velocity fluctuations and, oil flow visualization. Pressure …
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Development of Fiber Optic Aerodynamic Sensors for High Reynolds Number Supersonic Flows
… skin friction, temperature, and heat flux in high Reynolds number, supersonic flow. Using a standard fiber optic signal conditioning unit (specifically a broadband interferometric system using spectra), the work centered around determining under what conditions these sensors will work …
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Large Eddy Simulations of high Reynolds number Complex Flows with Synthetic Inlet Turbulence
… scale gas turbine combustors, which operate at high Reynolds numbers and high Swirl numbers. LES has several challenges which need to be surmounted for general application to complex high Reynolds number turbulent flows. The primary challenge in wall bounded flows is the need for very fine grids …
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The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers
The presence of roughness on a surface subject to high Reynolds number flows promotes the formation of a turbulent boundary layer and the generation of a fluctuating pressure field imposed on the surface. While numerous studies have investigated the wall pressure fluctuations over zero-pressure …
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Measurement of three-dimensional coherent fluid structure in high Reynolds number turbulent boundary layers
… of turbulent boundary layers. Increasing Reynolds Number increases the range of scales at which turbulence exists; a measurement technique must have a larger 'dynamic range' to fully resolve the flow. Tomographic PIV is currently limited in spatial dynamic range (which is also linked to …
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Formulation and evaluation of finite element discretization schemes for high Reynolds number incompressible fluid flows
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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Mean flow measurements of heated supersonic slot injection into a high Reynolds number supersonic stream
… the pressure and temperature measurements, Mach number, velocity, density, mass flux and static pressure profiles are generated. An unheated injection study is also performed at the same flow conditions for comparison to the heated case. The heated and unheated cases are very similar except in …
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Effects of Various Shaped Roughness Elements in Two-Dimensional High Reynolds Number Turbulent Boundary Layers
… of the element, which induces the downwash of higher momentum fluid toward the wall. This 'sweep' motion not only creates high Reynolds stresses (v^2, w^2, -uv) downstream of the element, but also leads to higher skin-friction drag. Triple products were also found to be very significant near …
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A 3-D vortex-boundary element method for the simulation of unsteady, high Reynolds number flows
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Pressure Fluctuations in a High-Reynolds-Number Turbulent Boundary Layer over Rough Surfaces of Different Configurations
The pressure fluctuations under a high Reynolds Number, rough-wall, turbulent, boundary layer have been studied in the Virginia Tech Stability Wind Tunnel. Rough surfaces of varying element height (1-mm, 3-mm), shape (hemispheres, cylinders) and spacing (5.5-mm, 10.4-mm, 16.5-mm) were investigated …
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