Numerical Experiments on the Flow Past a Circular Cylinder at Sub-critical Reynolds Number
Author: Patrick Beaudan
Publisher:
Published: 1994
Total Pages: 280
ISBN-13:
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Author: Patrick Beaudan
Publisher:
Published: 1994
Total Pages: 280
ISBN-13:
DOWNLOAD EBOOKAuthor: M. Budair
Publisher:
Published: 1981
Total Pages: 156
ISBN-13:
DOWNLOAD EBOOKAuthor: D. J. TRITTON
Publisher:
Published: 1959
Total Pages: 21
ISBN-13:
DOWNLOAD EBOOKAuthor: Hyun Jin Kim
Publisher:
Published: 1986
Total Pages: 506
ISBN-13:
DOWNLOAD EBOOKAn experimental investigation has been carried out on the flow transitions around a smooth circular cylinder in the initial stage of the critical Reynolds number region, where drag coefficient starts to decrease. In this Reynolds number region, intermitent reattachment of the separated boundary layer was found, while only initial separation position excursion was observed in the subcritical region. Large spanwise variations in the surface pressure and wake velocity observed in the first critical subregion were associated with local wake width pulsations caused by spanwise phase variations in the unsteady flow reattachment.
Author: Jorgen Fredsoe
Publisher: World Scientific
Published: 1997-03-17
Total Pages: 550
ISBN-13: 981449805X
DOWNLOAD EBOOKThis book discusses the subject of wave/current flow around a cylinder, the forces induced on the cylinder by the flow, and the vibration pattern of slender structures in a marine environment.The primary aim of the book is to describe the flow pattern and the resulting load which develops when waves or current meet a cylinder. Attention is paid to the special case of a circular cylinder. The development in the forces is related to the various flow patterns and is discussed in detail. Regular as well as irregular waves are considered, and special cases like wall proximities (pipelines) are also investigated.The book is intended for MSc students with some experience in basic fluid mechanics and for PhD students.
Author: Anatol Roshko
Publisher:
Published: 1961
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: David W. Coder
Publisher:
Published: 1971
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOKAuthor: Robert Leigh Underwood
Publisher:
Published: 1968
Total Pages: 112
ISBN-13:
DOWNLOAD EBOOKAn accurate description of the flow field about a cylinder is found possible with a semi-analytical solution of the full Navier-Stokes equations. The method of series truncation is employed to reduce the governing partial differential equations of motion to a system of ordinary differential equations which can be integrated numerically. This method, which has been applied to the hypersonic blunt-body problem by previous investigators with great success, is essentially a successive-approximation procedure which treats an elliptic partial differential equation as if it were parabolic or hyperbolic. The dependent variable is expanded in one co-ordinate, and backward influence in the resultant system of ordinary differential equations is prevented by series curtailment. Results are given for Reynolds numbers between 0.4 and 10.0 (based on diameter); however, the method can be applied to both higher and lower Reynolds numbers without modification. An accurate prediction of the Reynolds number at which separation first occurs behind the circular cylinder is made; this separation Reynolds number is found to be 5.75. Over the entire Reynolds-number range investigated, characteristic flow parameters such as the drag coefficient, pressure coefficient, standing-eddy length, and streamline pattern compare favorably with available experimental data and numerical-solution results. It is concluded that the semi-analytical method of series truncation permits accurate determination of the flow field about a circular cylinder at moderate Reynolds numbers without resorting either to full-numerical solution or to experiment. (Author).
Author: Robert D. Blevins
Publisher:
Published: 2001-01-01
Total Pages: 477
ISBN-13: 9781575241838
DOWNLOAD EBOOKFocuses on applications for offshore platforms and piping; and, wind-induced vibration of buildings, bridges, and towers. This title also focuses on acoustic and mechanical vibration of heat exchangers, power lines, and process ducting.
Author: D. Almosnino
Publisher:
Published: 1984
Total Pages: 40
ISBN-13:
DOWNLOAD EBOOKThe recently reported phenomenon of asymmetric flow separation form a circular cylinder in the critical Reynolds number regime has been confirmed in a water-tunnel experiment. For the first time, an attempt was made to visualize the wake of the cylinder during the transition from subcritical to critical flow and to correlate the visualizations with lift and drag measurements. The occurrence of the dominant asymmetric-flow state was quite repeatable, both when increasing and decreasing the Reynolds number, resulting in a mean lift coefficient of C sub l approx = to 1.2 and a shift in the angle of the wake by about 12 deg. A distinctive step change in the drag and shedding frequency was also found to occur. A hysteresis was confirmed to exist in this region as the Reynolds number was cycled over the transition range. Both boundaries of the asymmetry appear to be supercritical bifurcations in the flow. The asymmetry was normally steady in the mean; however, there were instances when the direction of the asymmetry reversed and remained so for the duration of the Reynolds number sweep through this transition region. A second asymmetry was observed at a higher Reynolds number; however the mean lift coefficient was much lower, and the direction of the asymmetry was not observed to reverse. Introducing a small local disturbance into the boundary layer was found to prevent the critical asymmetry from developing along the entire span of the cylinder. (Author).