Journal of Fluids Engineering, Transactions of the ASME

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A Vortex Model of the Darrieus Turbine: An Analytical and Experimental Study
Journal of Fluids Engineering, Transactions of the ASME - Tập 101 Số 4 - Trang 500-505 - 1979
Strickland, J. H., Webster, B. T., Nguyen, T.
Formation of Air Core in Nozzles With Tangential Entry
Journal of Fluids Engineering, Transactions of the ASME - Tập 123 Số 4 - Trang 829-835 - 2001
S. Dash, M. R. Halder, Milovan Perić, S. K. Som
The process of formation of air core and its development with time, inside one cylindrical and one conical nozzle having two tangential entries, has been analyzed experimentally and numerically. Experiments have been carried out using Plexiglas nozzles and water in ambient air; the air core has then been photographed for different nozzles and flow parameters. Numerical simulations have bee...... hiện toàn bộ
Wake Characteristics of Two Circular Cylinders Arranged Perpendicular to Each Other
Journal of Fluids Engineering, Transactions of the ASME - Tập 113 Số 1 - Trang 45-50 - 1991
T. A. Fox
The turbulent fluid motion established in the wake of two long, smooth circular cylinders arranged perpendicular to each other has been investigated in a steady, low-turbulence, uniform flow at Reynolds numbers of 2×104 and 2×103 (based on cylinder diameter and freestream velocity). A complex three-dimensional regime was found at the center of the configuration, the precise nature of which...... hiện toàn bộ
Flow Around Two Intersecting Circular Cylinders
Journal of Fluids Engineering, Transactions of the ASME - Tập 107 Số 4 - Trang 507-511 - 1985
M M Zdravkovich
One aspect of the flow around two intersecting cylinders, which has attracted little attention so far, is the structure of a three-dimensional near-wake behind the intersection. Some preliminary measurements of pressure distributions along the span were complemented by oil-film surface flow visualization. A strong secondary flow was found in the near-wake which extended spanwise more than ...... hiện toàn bộ
REVIEW—Review of Flow Interference Between Two Circular Cylinders in Various Arrangements
Journal of Fluids Engineering, Transactions of the ASME - Tập 99 Số 4 - Trang 618-633 - 1977
M M Zdravkovich
Abstract There are infinite numbers of possible arrangements of two parallel cylinders positioned at right angles to the approaching flow direction. Of the infinite arrangements, two distinct groups may be identified: in one group, the cylinders are in a tandem arrangement, one behind the other at any longitudinal spacing; and in the second group, th...... hiện toàn bộ
A Turbulent Energy Dissipation Model for Flows With Drag Reduction
Journal of Fluids Engineering, Transactions of the ASME - Tập 100 Số 1 - Trang 107-112 - 1978
Samuel Hassid, M. Poreh
A turbulent-energy-dissipation model is proposed for flows with and without drag reduction. The model is based on an eddy diffusivity approximation in the momentum equation, and on transport equations for the turbulent energy and the turbulent energy dissipation. The model describes the mean velocity profile and the turbulent energy distribution as a function of the reduction in the fricti...... hiện toàn bộ
A Turbulent Energy Model for Flows With Drag Reduction
Journal of Fluids Engineering, Transactions of the ASME - Tập 97 Số 2 - Trang 234-241 - 1975
S. Hassid, M. Poreh
A simple turbulent energy model, based on an improved version of Wolfshtein’s model for Newtonian flows, with a variable damping parameter, is used to describe the effect of linear polymers on the velocity profile and the turbulent energy distribution in channel and pipe flows. Measured mean velocity profiles seem to be in good agreement with the model, which predicts as well the observed ...... hiện toàn bộ
Numerical Simulation of Drag Reducing Turbulent Flow in Annular Conduits
Journal of Fluids Engineering, Transactions of the ASME - Tập 119 Số 4 - Trang 838-846 - 1997
Idir Azouz, Siamack A. Shirazi
Inadequate transport of rock cuttings during drilling of oil and gas wells can cause major problems such as excessive torque, difficulty to maintain the desired orientation of the drill string, and stuck or broken pipe. The problem of cuttings transport is aggravated in highly inclined wellbores due to the eccentricity of the annulus which results in nonuniformity of the flowfield within t...... hiện toàn bộ
Partially Averaged Navier–Stokes (PANS) Method for Turbulence Simulations—Flow Past a Square Cylinder
Journal of Fluids Engineering, Transactions of the ASME - Tập 132 Số 12 - 2010
Eun-Hwan Jeong, Sharath S. Girimaji
The partially averaged Navier–Stokes (PANS) approach is a bridging closure model intended for any level of resolution between the Reynolds averaged Navier–Stokes (RANS) method and direct numerical simulations. In this paper, the proposed closure model is validated in the flow past a square cylinder. The desired ratio of the modeled-to-resolved scales in the PANS closure is achieved by appr...... hiện toàn bộ
The Simulation of Mixing Layers Driven by Compound Buoyancy and Shear
Journal of Fluids Engineering, Transactions of the ASME - Tập 118 Số 2 - Trang 370-376 - 1996
Dale M. Snider, Malcolm Andrews
Fully developed compound shear and buoyancy driven mixing layers are predicted using a k-ε turbulence model. Such mixing layers present an exchange of equilibrium in mixing flows. The k-ε buoyancy constant Cε3 = 0.91, defined in this study for buoyancy unstable mixing layers, is based on an approximate self-similar analysis and an accurate numerical solution. One-dimensional transient and ...... hiện toàn bộ
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