Journal of Fluids Engineering, Transactions of the ASME

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The Development Lengths of Laminar Pipe and Channel Flows
Journal of Fluids Engineering, Transactions of the ASME - Tập 127 Số 6 - Trang 1154-1160 - 2005
F. Durst, Subhabrata Ray, Bülent Ünsal, O. A. Bayoumi
Abstract The authors’ research work into fully developed pulsating and oscillating laminar pipe and channel flows raised questions regarding the development length of the corresponding steady flow. For this development length, i.e., the distance from the entrance of the pipe to the axial position where the flow reaches the parabolic velocity profile ...... hiện toàn bộ
Visualization Studies of a Shear Driven Three-Dimensional Recirculating Flow
Journal of Fluids Engineering, Transactions of the ASME - Tập 106 Số 1 - Trang 21-27 - 1984
Jeffrey R. Koseff, Robert L. Street
A facility has been constructed to study shear-driven, recirculating flows. In this particular study, the circulation cell structure in the lid-driven cavity is studied as a function of the speed of the lid which provides the shearing force to a constant and uniform density fluid. The flow is three-dimensional and exhibits regions where Taylor-type instabilities and Taylor-Go¨rtler-like vo...... hiện toàn bộ
Comprehensive Approach to Verification and Validation of CFD Simulations—Part 1: Methodology and Procedures
Journal of Fluids Engineering, Transactions of the ASME - Tập 123 Số 4 - Trang 793-802 - 2001
Fred Stern, Richard L. Wilson, Hugh W. Coleman, Eric G. Paterson
Part 1 of this two-part paper presents a comprehensive approach to verification and validation methodology and procedures for CFD simulations from an already developed CFD code applied without requiring availability of the source code for specified objectives, geometry, conditions, and available benchmark information. Concepts, definitions, and equations derived for simulation errors and u...... hiện toàn bộ
Perspective: A Method for Uniform Reporting of Grid Refinement Studies
Journal of Fluids Engineering, Transactions of the ASME - Tập 116 Số 3 - Trang 405-413 - 1994
Patrick J. Roache
This paper proposes the use of a Grid Convergence Index (GCI) for the uniform reporting of grid refinement studies in Computational Fluid Dynamics. The method provides an objective asymptotic approach to quantification of uncertainty of grid convergence. The basic idea is to approximately relate the results from any grid refinement test to the expected results from a grid doubling using a ...... 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
Three-dimensional Hybrid Continuum-Atomistic Simulations For Multiscale Hydrodynamics
Journal of Fluids Engineering, Transactions of the ASME - Tập 126 Số 5 - Trang 768-777 - 2004
H. S. Wijesinghe, Richard D. Hornung, Alejandro L. Garcia, Nicolas G. Hadjiconstantinou
We present an adaptive mesh and algorithmic refinement (AMAR) scheme for modeling multi-scale hydrodynamics. The AMAR approach extends standard conservative adaptive mesh refinement (AMR) algorithms by providing a robust flux-based method for coupling an atomistic fluid representation to a continuum model. The atomistic model is applied locally in regions where the continuum description is...... hiện toàn bộ
Long-Period Pressure Pulsation Estimated in Numerical Simulations for Excessive Flow Rate Condition of Francis Turbine
Journal of Fluids Engineering, Transactions of the ASME - Tập 136 Số 7 - 2014
Kenji Shingai, N Okamoto, Yasutaka Tamura, Kiyohito Tani
A series of numerical simulations for a Francis turbine were carried out to estimate the unsteady motion of the cavity in the draft tube of the turbine under a much larger flow rate condition than the swirl-free flow rate. The evaporation and condensation process was described by using a simplified Rayleigh–Plesset equation. A two-phase homogeneous model was adopted to calculate the mixtur...... hiện toàn bộ
Transient Pressure Measurements on a High Head Model Francis Turbine During Emergency Shutdown, Total Load Rejection, and Runaway
Journal of Fluids Engineering, Transactions of the ASME - Tập 136 Số 12 - 2014
Chirag Trivedi, Michel J. Cervantes, Bhupendra K. Gandhi, Ole Gunnar Dahlhaug
The penetration of intermittent wind and solar power to the grid network above manageable limits disrupts electrical power grids. Consequently, hydraulic turbines synchronized to the grid experience total load rejection and are forced to shut down immediately. The turbine runner accelerates to runaway speeds in a few seconds, inducing high-amplitude, unsteady pressure loading on the blades...... hiện toàn bộ
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