The Development Lengths of Laminar Pipe and Channel FlowsJournal 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 of the Hagen-Poiseuille
flow, a wide range of co... hiện toàn bộ
Visualization Studies of a Shear Driven Three-Dimensional Recirculating FlowJournal 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
vortices a... hiện toàn bộ
Comprehensive Approach to Verification and Validation of CFD Simulations—Part 1: Methodology and ProceduresJournal 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
uncertain... hiện toàn bộ
Perspective: A Method for Uniform Reporting of Grid Refinement StudiesJournal 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
second-o... hiện toàn bộ
Wake Characteristics of Two Circular Cylinders Arranged Perpendicular to Each OtherJournal 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 is depe... hiện toàn bộ
Flow Around Two Intersecting Circular CylindersJournal 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 three di... hiện toàn bộ
REVIEW—Review of Flow Interference Between Two Circular Cylinders in Various ArrangementsJournal 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, the cylinders face the flow side by side at
any tr... hiện toàn bộ
Three-dimensional Hybrid Continuum-Atomistic Simulations For Multiscale HydrodynamicsJournal 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 invalid... hiện toàn bộ
Transient Pressure Measurements on a High Head Model Francis Turbine During Emergency Shutdown, Total Load Rejection, and RunawayJournal 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.
This s... hiện toàn bộ