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Characteristics of Shallow Wakes in an Open Channel
Volume 7: Fluids Engineering Systems and Technologies, 2014A numerical investigation of shallow wake flow in an open channel has been conducted using Detached Eddy Simulation (DES) based on the three-dimensional unsteady Reynolds-Averaged Navier Stokes (RANS) equations with the k-ω SST (shear stress transport) turbulence model.
G. Nasif, R. Balachandar, R. M. Barron
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Characteristics of vorticity fluctuations in a turbulent wake
Journal of Fluid Mechanics, 1988Measurements of the lateral components of the vorticity fluctuation have been made in the self-preserving turbulent wake of a circular cylinder. Each component was obtained separately using two X-wires separated in the appropriate lateral directions. The two velocity derivatives which make up the streamwise vorticity component were also determined but ...
R. A. Antonia +2 more
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Characteristics of the wake behind a cascade of airfoils
Journal of Fluid Mechanics, 1973An analytical and experimental investigation of the near and far wake characteristics of a cascade of airfoils is reported in this paper. The measurement of mean velocity, turbulence intensity and Reynolds stress across the wake at several distances downstream of the cascade indicates that the wake is asymmetrical and this asymmetry is maintained even ...
Raj, R., Lakshminarayana, B.
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Vorticity characteristics of the turbulent intermediate wake
Experiments in Fluids, 1996Measurements of the lateral components ω j (j=2 and 3) of the vorticity fluctuation vector have been made, using a vorticity probe consisting of two X-wires, in the intermediate wake of a circular cylinder. The effect of the spatial resolution of the probe on the measurement of ω j has been studied.
Mi, Jianchun, Antonia, R. A.
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Turbulence characteristics in wind-turbine wakes
Journal of Wind Engineering and Industrial Aerodynamics, 1996Abstract An analysis of the evolution of turbulence characteristics in wind-turbine wakes has been carried out. Based on experimental results and on numerical results obtained with a CFD code, complemented with some theoretical considerations, simple analytical expressions are proposed for the estimation of the turbulent kinetic energy, k, and its ...
A. Crespo, J. Herna´ndez
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Prediction of full scale wake characteristics based on model wake survey
International Shipbuilding Progress, 1975This paper deals with the problem of the prediction of the effective wake distribution in the propeller plane of a ship, using the measured nominal wake of a model as a starting point. The chosen prediction method consists of two successive steps, viz.
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Unsteady Turbine Blade Wake Characteristics
Journal of Turbomachinery, 2004The paper presents an experimental investigation of large coherent structures, commonly referred to as “von Karman vortex street,” in the wake of a turbine blade at high subsonic Mach number M2,is=0.79 and high Reynolds number (RE=2.8×106 and their effect on the steady and unsteady pressure and temperature distribution in the wake.
Claus H. Sieverding +5 more
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Effects of riblets on the wake characteristics of an airfoil
7th Applied Aerodynamics Conference, 1989s+ = spacing of riblets in law of the wall variables Measurements were made in the near and inter- TKE = kinetic mediate wake regions of a NACA 0012 airfoil with three different riblet sizes at a freestream Reynolds number of 2.5 x lo5. The riblets were the symmetric v-grooved type of heights .0229, .076, and .I52 mm, recrpectively.
J. CARAM, A. AHMED
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Characteristics of the near wake of a cylinder at low Reynolds numbers
European Journal of Mechanics - B/Fluids, 1999An experimental study has been made of the near wake of two two-dimensional bluff bodies, a circular cylinder and a flat ribbon in the regimes corresponding to the 2-D steady and 2-D periodic wake. Velocity measurements from both hot-wire and laser Doppler anemometry are compared.
Paranthoen, Pierre +4 more
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Wake vortex characteristics of transport aircraft
Progress in Aerospace Sciences, 2011Abstract The flow and flight physics of wake vortex systems has been intensively investigated concentrating on a large variety of aspects. This paper gives a brief overview on past and present wake vortex research activities such as early studies, integrated programs, model and flight tests, numerical investigations, fundamental physical aspects and ...
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