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2 edition of Experiments on smooth cantilevered circular cylinders in a low-turbulance uniform flow found in the catalog.

Experiments on smooth cantilevered circular cylinders in a low-turbulance uniform flow

T.A Fox

Experiments on smooth cantilevered circular cylinders in a low-turbulance uniform flow

by T.A Fox

  • 66 Want to read
  • 16 Currently reading

Published by University of Queensland, Dept. of Civil Engineering in Brisbane .
Written in English


Edition Notes

StatementT.A. Fox and G.S. West. Part1, Mean loading with aspect ratios in the range 4 to 30.
SeriesResearch report / University of Queensland. Department of Civil Engineering -- no.CE130, Research report (University of Queensland. Department of Civil Engineering) -- no.CE130.
ContributionsWest, G. S.
ID Numbers
Open LibraryOL19558976M

[7]E. Achenbach and E. Heinecke. On vortex shedding from smooth and rough cylinders in the range of Reynolds numbers 6 to 5 J. Fluid Mech., {, [8]M. Breuer. A challenging test case for large eddy simulation: high Reynolds number circular cylinder ow. Inter. J. Heat Fluid Flow, 21(5){, [9]D. J. Tritton.   The Saguaro cactus-inspired cylinder with 24 circumferential grooves was seen to have large reductions (~20%) for mean and fluctuating alongwind base shear (drag) and overturning moments in comparison with smooth cylinders and is in agreement with 2D studies in uniform low turbulence flow. Domed tops also led to reduced drag over flat tops.

The tests have considered three circular cylinders of mass ratio equal to one and different aspect ratios, respectively L/D = , , and , as well as a fourth cylinder of . Flow Around a Circular Cylinder. Flow around a circular cylinder can be approached from the previous example by bringing the source and the sink closer. Then we are considering a uniform flow in combination with a doublet. The stream function and the velocity potential for this flow are given by.

Abstract. The effect of cylinder aspect ratio (≡H/d, where H is the cylinder height or length, and d is the cylinder diameter) on the drag of a wall-mounted finite-length circular cylinder in both subcritical and critical regimes is experimentally investigated. Two cases are considered: a smooth cylinder submerged in a turbulent boundary layer and a roughened cylinder immersed in a laminar. This paper presents experimental results on the vortex shedding frequency measured behind a bent cylinder. Experiments were conducted in a wind tunnel covering Reynolds numbers between 50 and , a range of interest for flow sensing, flow control, and energy harvesting applications. The bent cylinder comprised a vertical leg always oriented at normal incidence with respect to the free-stream.


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Experiments on smooth cantilevered circular cylinders in a low-turbulance uniform flow by T.A Fox Download PDF EPUB FB2

Part 2 of this report presents details of an investigation into the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of 30 immersed in a low-turbulence uniform flow. Experiments were carried out in a wind tunnel at Reynolds numbers of x 10(exp 4) and x 10(exp 4) and involved the measurement of fluctuating pressures and forces.

mean loading of smooth, cantilevered circular cylinders immersed in a low-turbulence uniform flow. Experiments were performed in a wind 4 tunnel at a Reynolds number of x 10 for aspect ratios in the range 4 to Mean surface pressures and vortex shedding frequencies were measured, from which the local mean pressure drag and Stroulial number.

Flow past a circular cylinder at high Reynolds number diameter was Sft. The wind speeds were about m.p.h., which corre- sponds to Reynolds numbers of x lo6. Their mean value of C, for a group of observations is &and it may be seen that this agrees quite well with our results. Part 2 presents details of an investigation into the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of 30 immersed in a low-turbulence uniform flow.

Experiments were carried out in a wind tunnel at a Reynolds number of 44 × 10 4 and involved the measurement of fluctuating pressures and forces. Oil-flow visualization was performed to determine the flow pattern at the surface of the by:   Part 3 of this study presents details of an investigation into the fluctuating pressures and loads induced on smooth, cantilevered circular cylinders immersed in a low-turbulence, uniform flow.

Experiments were carried out in a wind tunnel at a Reynolds number of × 10 4 for aspect ratios in the range 4 to R.m.s. pressures on the surface of the cylinder and r.m.s.

lift and drag were Cited by: configuration, such as flow past a circular cylinder or sphere have been subject of extensive experimental and computational investigation as the generic configurations. In the present analysis, a smooth and infinitely long cylinder blown by a unidirectional, homogeneous flow in.

Part 2 presents details of an investigation into the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of 30 immersed in a low-turbulence uniform flow.

Experiments were carried out in a wind tunnel at a Reynolds number of × and involved the measurement of fluctuating pressures and by: The flow field around a circular cylinder mounted vertically on a flat bottom has been investigated experimentally.

This type of flow occurs in several technical applications, e.g. local scouring around bridge piers. Hydrogen bubble flow visualization was carried out for Reynolds numbers ranging from 6, to 65, The main flow characteristic upstream of the cylinder is a system of horse.

Part 3 of this study presents details of an investigation into the fluctuating pressures and loads induced on smooth, cantilevered circular cylinders immersed in a low-turbulence, uniform flow. This net force along the flow direction is called the drag.

Averaged velocity profiles of the flow past a circular cylinder is provided as a general representation of the wake flow field. Selected profiles at several representative regions is also presented for your reference. Near the cylinder, flow separates from the surface.

Part 2 presents details of an investigation into the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of 30 immersed in a low-turbulence uniform flow. Flow around a cantilevered circular cylinder has been studied experimentally in the subcritical and critical Reynolds-number ranges.

Particular attention was paid to the free-stream turbulence effects on the steady aerodynamic characteristics of the cylinder. A. Ideal flow model of flow past a circular cylinder In AOE you studied irrotational incompressible flow past a circular cylinder without circulation (see Bertin,section ).

Such a flow can be generated by adding a uniform flow, in the positive x direction to a doublet at the origin directed in the negative x direction. 4. CONCLUDING REMARKS The experiments described have revealed the nature and extent of the disturbance to vortex shedding caused by flow over the free-end of a long, smooth, circular cylinder immersed in a low-turbulence uniform flow at Reynolds number, Abstract Part 2 presents details of an investigation into the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of 30 immersed in a low-turbulence uniform flow.

Experiments were carried out in a wind tunnel at a Reynolds number of 44 × and involved the measurement of fluctuating pressures and forces.

Fox, T. and West, G. S., “ Fluid-induced loading of cantilevered circular cylinders in a low-turbulence uniform flow. Part 2: Fluctuating loads on a cantilever of aspect ra” J. Fluids Struct. 7, 15– 28 (). Experiments on smooth cantilevered circular cylinders in a low-turbulence uniform flow.

Part 2, Fluctuat Pressure distributions from subsonic tests of an advanced laminar-flow-control wing with leading- and tr Development and validation of an advanced low-order panel method [microform] / Dale L.

Ashby, Michael Du. Fox, T. & Apelt, C. Fluid-induced loading of a cantilevered circular cylinders in a low turbulence uniform flow. Part 3: fluctuating loads with aspect. Y. Uematsu, et al./Aerodynamic forces on circular cylinders of finite height 3. Results in smooth and in turbulent flow Mean drag coefficient Most of the previous experiments on the flow past cantilevered circular cylinders have been conducted in the subcritical regime.

Investigation of the upstream end effect on the flow characteristics of yawed circular cylinders - Volume Issue - A. Gatto, N. Ahmed, R. Archer Please note, due to essential maintenance online purchasing will not be possible between and BST on Sunday 6th May.

Experiments on smooth cantilevered circular cylinders in a low-turbulence uniform flow. the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of Full text of "DTIC ADA In-Line and Transverse Forces on Smooth and Sand-Roughened Cylinders in Oscillatory Flow at High Reynolds Numbers" See other formats NPS-^9SUTO2 NAVAL POSTGRADUATE SCHOOL Monterey, Dalifornia IN-LINE AID n^ANSVERSE FORCES ON SMOOIH AID SAND-ROUGHENED CYLINDERS IN OSCIliATORY FLOW AT HIGH REYNOLDS NUMBERS .A uniform flow past a two-dimensional square cylinder is a typical bluff-body-flow problem, which involves fundamental researches of the surrounding flow behaviour and the effect of the body.

Physically, as the flow passes the body, separation is initiated at the leading edges of the cylinder .