1 edition of **Transverse forces on smooth and rough cylinders in harmonic flow at high Reynolds numbers** found in the catalog.

- 368 Want to read
- 12 Currently reading

Published
**1976**
by Naval Postgraduate School in Monterey, California
.

Written in English

- Mechanical engineering

ID Numbers | |
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Open Library | OL25388910M |

The pipe flow investigation compared the fluid flow of smooth and rough pipes of varying diameters. The pressure drop across the pipes was recorded to find both the friction factors and Reynolds numbers. A moody diagram was plotted comparing the friction factor versus the Reynolds number. with varying low Reynolds numbers. A large-eddy simulation (LES) for flow over a triangular cylinder was reported by Camarri et al. (). Iungo and Buresti () investigated the effects of cross-section shape and wind direction on a triangular cylinder in a wind-tunnel at high Reynolds number. Bao et al. () considered flow over anAuthor: Q. Zhai, H. K. Wang, G. L. Yu.

Transverse structure functions are obtained at high Reynolds numbers in atmospheric turbulence ~Taylor microscale Reynolds numbers between 10 and 15 !. These measurements conﬁrm that their scaling exponents are different from those for longitudinal structure functions. Implications of this conclusion are discussed brieﬂy. hydrodynamic forces on oscillating cylinders Body shapes that correspond to b =, , , , and the rounded square used in the forced oscillation experiments (solid line) are depicted in.

Schewe [11]. At the larger Reynolds, forces on the cylinder recover their symmetry (see ﬁgure 2). In the ﬁnal version of the manuscript, results of the different ﬂow conﬁgurations observed at the different Reynolds numbers will be given, together with measurements of the local forces and characteristics frequencies of the ﬂow. high Reynolds number (8×~×) and they found that the amplitude ratio（A/D）increased with Reynolds number within the upper branch and Reynolds number had a strong influence than the mass ratio on A/D in some cases. In recent years, Chinese scholars focused more attention on the Computational Fluid Dynamics (CFD) evaluation method.

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"In-Line and Transverse Forces on Cylinders in Oscillatory Flow at High Reynolds Numbers*'* Offshore Technology Conference, Paper No.

May Collins, N. J., "Transverse Forces on Smooth and Rough Cylinders in Harmonic Flow at High Reynolds Numbers", Thesis presented to the Naval Postgraduate School, Monterey, Calif., June Full text of "Vortex shedding and resistance in harmonic flow about smooth and rough circular cylinders at high Reynolds numbers" See other formats.

Abstract: This report presents the results on an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory water flow at Reynolds numbers up toKeulegan-Carpenter numbers up toand relative roughnesses from 0.

to The drag and inertia coefficients have been determined through the use of. ABSTRACT This paper presents the results of an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory flow at Reynolds numbers up toKeulegan-Carpenter numbers up Cited by: VORTEX SHEDDING AND RESISTANCE IN HARMONIC FLOW ABOUT SMOOTH AND ROUGH CIRCULAR CYLINDERS AT HIGH REYNOLDS NUMBERS.

This report presents the results on an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory water flow at Reynolds numbers up toKeulegan Cited by: INTRODUCTION The aerodynamic forces produced by flow about circular cylinders with the longi- tudinal axis perpendicular to the flow have been of interest since the ancient invention of the Aeolian harp.

For some time it has been generally known that the behavior of a cylinder in a laminar flow at low Reynolds numbers is characterized by the formation of. This paper presents the results of an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory flow at Reynolds numbers up toKeulegan-Carpenter numbers up toand relative roughness from to Cited by: Sarpkaya, T.

Vortex shedding and resistance in harmonic flow about smooth and rough circular cylinders at high Reynolds numbers. Tech. Rep. NPSSL, Naval Postgraduate School, Monterey, by: This paper presents the results of an extensive experimental investigation of the in-line and transverse forces acting on smooth and rough circular cylinders placed in oscillatory flow at Reynolds.

Comparison of turbulent boundary layers over smooth and rough surfaces up to high Reynolds numbers - Volume - D. Squire, C. Morrill-Winter, N. Hutchins, M. P Cited by: Transverse flow over a wavy cylinder was investigated experimentally; surface‐pressure distributions and flow visualizations were obtained for a set of wavy cylinders with different axial wavelengths.

Significant spanwise pressure gradients were present, resulting in three‐dimensional separation lines and the formation of streamwise trailing vortex structures near the geometric by: The problem of flow past a permeable cylinder at low Reynolds numbers is of interest for the solution of a number of problems in chemical technology in, for example, the design of porous electrodes and porous catalysts and in the calculation of nonstationary filtration of aerosols by fibrous filters.

In the present paper, we solve the problem of transverse flow of a viscous fluid past a Cited by: The transverse forces on submerged cylinders in nearly axial flow were studied experimentally in a towing tank.

Two rigid cylinders with length to diameter ratios of 10 and 30 were towed with angles from 0 ∘ to 20 ∘ between their centerline and the incoming flow, and with a combination of forced harmonic oscillations in the normal direction and constant speeds along the cylinder by: Sarpkaya, T.,“Vortex Shedding and Resistance in Harmonic Flow about Smooth and Rough Circular Cylinders at High Reynolds Numbers,” Report No.

NPSSL, Naval Postgraduate School, Monterey, CA. In-Line and Transverse Forces on Cylinders in Cited by: 2. TABLE OF CONTENTS Chapter Page List of Figures List of Tables vi List of Symbols vii INTRODUCTION 1 Scope 1 Purpose 2 Adjunct Topics of Fluid Forces on Cylinders 2 Proximity Effect 3 Diffraction Theory 4 Other Shapes of Structure 6 Other Environmental Loads 7 FLUID FORCE - DRAG/INERTIA REGIME 8 Steady State Ambient Flow 8 Drag.

pared with the Reynolds stress for a translating cylinder. The numerical method used for the present exercise has earlier been used in Sengupta and Sengupta [21] for ﬂow past a translating cylinder at high Reynolds numbers. When the same method was used for the rotating cylinder case, it exhibited some convergence and grid depen-dence problems.

Flow past rectangular cylinders: receptivity to transverse forcing By B. TAN, M. THOMPSON AND K. HOURIGAN Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, PO Monash University, Clayton, VictoriaAustralia (Received 9 December and in revised form 30 April ).

The Morison equation is the sum of two force components: an inertia force in phase with the local flow acceleration and a drag force proportional to the (signed) square of the instantaneous flow inertia force is of the functional form as found in potential flow theory, while the drag force has the form as found for a body placed in a steady flow.

In-line motion amplitude, cross-flow amplitude, phase between in-line and cross-flow motion, and reduced velocity are varied, producing a four-dimensional matrix of data points, at a Reynolds number of In free vibrations, variation of the effective added mass drives the system to specific steady-state oscillations, under lock-in by: 3.

UNSTEADY LIFT FORCES GE$!ERA!I%D BY VORTEX SHEDDING ABOUT A DIRGE, STATIONARY, AND 0SCIW;ATING CYLINDER AT HIGH REYNOLDS NUMBERS By George W. Jones, Jr. NASA Langley Research Center ABSTRACT A wind-tunnel study has been made of the unsteady lift (crosswind) forces on a large, two-diaensional cylinder with axis perpendicular to the flow.

Reynolds numbers and "inertial force" while a low number indicates laminar flow, smooth flow. Wiki gives a good explanation of the specific ratio that is the Reynolds number (of the scales of turbulence wrt energy dissipation).

For very high Reynolds numbers, the flow can often be approximated reasonably accurately as inviscid, for example.Oscillating Flow About Two and Three-Dimensional Bilge Keels “Vortex Shedding and Resistance in Harmonic Flow about Smooth and Rough Circular Cylinders at High Reynolds Numbers,” Report No: NPSSL, Naval Postgraduate School, Monterey, CA.

Sarpkaya. T.,“ In-Line and Transverse Forces on Cylinders in Oscillatory Flow Cited by: Flow past a smooth circular cylinder at high Reynolds number (Re= x ) which covers the upper-transition regime has been investigated numerically by using Open source Field Operation and Manipulation (OpenFOAM) package.

OpenFOAM is a free, open source Computational Fluid Dynamics (CFD) software package. The numerical model has been set up as two dimensional (2D), transient, Cited by: 2.