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Experimental And Numerical Investigations Of The Flow Development Over Circular Cylinders With Stepwise Discontinuities In Diameter
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Book Synopsis Experimental and Numerical Investigations of the Flow Development Over Circular Cylinders with Stepwise Discontinuities in Diameter by : Christopher R. Morton
Download or read book Experimental and Numerical Investigations of the Flow Development Over Circular Cylinders with Stepwise Discontinuities in Diameter written by Christopher R. Morton and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow past circular cylinders with stepwise discontinuities in diameter was investigated experimentally and numerically for the diameter ratio D/d = 2 and three Reynolds numbers, Re = 150, 300, and 1050. The investigation was focused on the vortex shedding phenomena occurring in the wake of the cylinders. In the first series of experimental and numerical studies, the flow development past a single step cylinder was investigated. The single step cylinder model is comprised of a small diameter cylinder (d) attached coaxially to a large diameter cylinder (D). The results show that three distinct spanwise vortex cells form in the step cylinder wake: a single vortex shedding cell in the wake of the small cylinder (the S-cell) and two vortex shedding cells in the wake of the large cylinder, one in the region downstream of the step (the N-cell) and the other away from the step (the L-cell). Due to the differences in vortex shedding frequencies between the three cells, complex vortex connections occur in two vortex-interaction regions located between the adjacent cells. The region at the boundary between the S-cell and the N-cell is relatively narrow and its spanwise extent does not fluctuate significantly. In this region, vortex dislocations manifested as half-loop connections between two S-cell vortices of opposite sign. In contrast, the region at the boundary between the N-cell and the L-cell exhibits a transient behavior, with large scale vortex dislocations causing cyclic variation in the extent of N-cell vortices. For Re = 300 and 1050, small scale streamwise vortices forming in the wake complicate the vortex dynamics within the adjacent S-cell and L-cell. There is no significant Reynolds number effect on the average spanwise extent of the vortex cells and the two transition regions between neighboring cells. Finally, formation of N-cell vortices is linked to downwash fluctuations near the step. The flow development past a dual step cylinder was studied experimentally for Re = 1050. The dual step cylinder model is comprised of a small diameter cylinder (d) and a large diameter cylinder (D) mounted at the mid-span of the small cylinder. The experiments were completed for a range of large cylinder aspect ratios 0.2 ≤ L/D ≤ 17. The flow development is highly dependent on the aspect ratio of the large cylinder, L/D. The results identify four distinct flow regimes: (i) for L/D = 17, three vortex shedding cells form in the wake of the large cylinder, one central cell and two cells of lower frequency extending over about 4.5D from the large cylinder ends, (ii) for 7
Book Synopsis Experimental and Numerical Investigations of the Flow Development Over Cylinders with Stepwise Discontinuities in Diameter by : Christopher R. Morton
Download or read book Experimental and Numerical Investigations of the Flow Development Over Cylinders with Stepwise Discontinuities in Diameter written by Christopher R. Morton and published by . This book was released on 2010 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow past circular cylinders with stepwise discontinuities in diameter was investigated experimentally and numerically for the diameter ratio D/d = 2 and three Reynolds numbers, Re = 150, 300, and 1050. The investigation was focused on the vortex shedding phenomena occurring in the wake of the cylinders. In the first series of experimental and numerical studies, the flow development past a single step cylinder was investigated. The single step cylinder model is comprised of a small diameter cylinder (d) attached coaxially to a large diameter cylinder (D). The results show that three distinct spanwise vortex cells form in the step cylinder wake: a single vortex shedding cell in the wake of the small cylinder (the S-cell) and two vortex shedding cells in the wake of the large cylinder, one in the region downstream of the step (the N-cell) and the other away from the step (the L-cell). Due to the differences in vortex shedding frequencies between the three cells, complex vortex connections occur in two vortex-interaction regions located between the adjacent cells. The region at the boundary between the S-cell and the N-cell is relatively narrow and its spanwise extent does not fluctuate significantly. In this region, vortex dislocations manifested as half-loop connections between two S-cell vortices of opposite sign. In contrast, the region at the boundary between the N-cell and the L-cell exhibits a transient behavior, with large scale vortex dislocations causing cyclic variation in the extent of N-cell vortices. For Re = 300 and 1050, small scale streamwise vortices forming in the wake complicate the vortex dynamics within the adjacent S-cell and L-cell. There is no significant Reynolds number effect on the average spanwise extent of the vortex cells and the two transition regions between neighboring cells. Finally, formation of N-cell vortices is linked to downwash fluctuations near the step. The flow development past a dual step cylinder was studied experimentally for Re = 1050. The dual step cylinder model is comprised of a small diameter cylinder (d) and a large diameter cylinder (D) mounted at the mid-span of the small cylinder. The experiments were completed for a range of large cylinder aspect ratios 0.2 [les] L/D [les] 17. The flow development is highly dependent on the aspect ratio of the large cylinder, L/D. The results identify four distinct flow regimes: (i) for L/D = 17, three vortex shedding cells form in the wake of the large cylinder, one central cell and two cells of lower frequency extending over about 4.5D from the large cylinder ends, (ii) for 7
Book Synopsis Engineering Fluid Dynamics by : Bjørn H. Hjertager
Download or read book Engineering Fluid Dynamics written by Bjørn H. Hjertager and published by MDPI. This book was released on 2018-04-06 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Engineering Fluid Dynamics" that was published in Energies
Book Synopsis Proceedings of the Fourth International Conference in Ocean Engineering (ICOE2018) by : K. Murali
Download or read book Proceedings of the Fourth International Conference in Ocean Engineering (ICOE2018) written by K. Murali and published by Springer. This book was released on 2019-01-16 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises selected proceedings of the Fourth International Conference in Ocean Engineering (ICOE2018), focusing on emerging opportunities and challenges in the field of ocean engineering and offshore structures. It includes state-of-the-art content from leading international experts, making it a valuable resource for researchers and practicing engineers alike.
Book Synopsis Numerical Investigations of Flow Around a Wire-wrapped Rotating Cylinder by : Assma Begum
Download or read book Numerical Investigations of Flow Around a Wire-wrapped Rotating Cylinder written by Assma Begum and published by . This book was released on 2018 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Numerical investigations of flow past rotating circular cylinders with and without wires wrapped on the surface of the cylinder were studied using Computational Fluid Dynamics (CFD). The flow characteristics such as flow separation, shedding of the primary and secondary vortices, and drag coefficients were investigated. The software STAR CCM+ from Siemens PLM was used in all investigations. Three-dimensional Unsteady Reynolds Average Navier Stokes (URANS) equations were utilized. The free stream mean velocity was constant at 10 m/sec, which corresponded to an approximate Reynolds number based on cylinder’s diameter of 32,000. The results are presented for cylinders with and without wires at varying rotation rates [alpha] of 0, 0.5, and 1. This is represented by [alpha], the ratio of the tangential velocity at the cylinder to that of the free stream velocity of the flow. As the rotation rate increased from 0 to 1, the drag coefficient for the smooth rotating cylinder reduced, while the drag coefficient for the wire-wrapped cylinder increased. The wire-wrapped cylinder produced significantly higher lift when compared with the corresponding value for the smooth cylinder. Increasing the rotation rate increases the lift and lift to drag ratio.
Book Synopsis Flow Around Circular Cylinders by : M.M. Zdravkovich
Download or read book Flow Around Circular Cylinders written by M.M. Zdravkovich and published by Oxford University Press. This book was released on 1997 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text offers an authoritative compilation of experimental data, theoretical models, and computer simulations which will provide the reader with a comprehensive survey of research work on the phenomenon of flow around circular cylinders.
Book Synopsis Electromechanical and Systems Engineering by : G. Urriolagoitia-Calderón
Download or read book Electromechanical and Systems Engineering written by G. Urriolagoitia-Calderón and published by Trans Tech Publications Ltd. This book was released on 2009-08-31 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume presents selected peer-reviewed papers related to diverse aspects of mechanics and materials. Cases related to the flow of fluids under various conditions, as well as heat transfer, are analyzed. There are also contributions, to the field of the design of mechanisms, which focus on biomechanics and the synthesis of mechanisms. Papers on mechanical vibration are linked to the design of machine tools, rotodynamics and vibrations in microbeams. Also, the evaluation of residual stresses and the estimation of the mechanical properties of vegetal materials are treated. Finally, fractal analysis is applied to solar radiation, and to the materials used in nanomedicine.
Book Synopsis An Experimental Investigation on the Flow Around a Circular Cylinder in the First Critical Subregion by : Hyun Jin Kim
Download or read book An Experimental Investigation on the Flow Around a Circular Cylinder in the First Critical Subregion written by Hyun Jin Kim and published by . This book was released on 1986 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: An 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.
Book Synopsis An Experimental Investigation of the Surface Flow and Wake Dynamics Associated with Transverse Flow Over Wavy Cylinders by : Byram Bays-Muchmore
Download or read book An Experimental Investigation of the Surface Flow and Wake Dynamics Associated with Transverse Flow Over Wavy Cylinders written by Byram Bays-Muchmore and published by . This book was released on 1991 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Flow Past a Finite Circular Cylinder at a Low Subcritical Reynolds Number by : M. Budair
Download or read book An Experimental Investigation of the Flow Past a Finite Circular Cylinder at a Low Subcritical Reynolds Number written by M. Budair and published by . This book was released on 1981 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Experiments on the Flow Past a Circular Cylinder at Sub-critical Reynolds Number by : Patrick Beaudan
Download or read book Numerical Experiments on the Flow Past a Circular Cylinder at Sub-critical Reynolds Number written by Patrick Beaudan and published by . This book was released on 1994 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Control Around Circular Cylinder by : Abdulaziz Mohammed AlRefaie
Download or read book Flow Control Around Circular Cylinder written by Abdulaziz Mohammed AlRefaie and published by . This book was released on 2009 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents experimental and numerical investigations of flows around a circular cylinder with different ventilation hole shapes and ventilation holes arrangement. Ten models with different ventilation configurations are tested at ReD 55000, and data were acquired for each case at flow angles ranging from 0° to 180° at increment of 2.5°. It has been found that the best results in terms of drag force reduction are models where the holes are located on the sides (shoulders). With the best hole-configuration, the mean drag coefficient is reduced by 33.5% compared to the smooth surface case. Numerical investigations were conducted using FLUENT on a smooth cylinder and the cylinder with the experimentally-determined best hole-configuration. The CFD results show that the flow through the holes fixes the local separation locations on the cylinder, thereby reduce the flow induced force oscillation. The Strouhal number associated with vortex shedding is reduced from the smooth cylinder.
Book Synopsis Experimental and Numerical Investigation of Flow Past a Freely Rotatable Square Cylinder by : Tarek G. Zaki
Download or read book Experimental and Numerical Investigation of Flow Past a Freely Rotatable Square Cylinder written by Tarek G. Zaki and published by . This book was released on 1991 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Circular Cylinders and Pressure Vessels by : Vincenzo Vullo
Download or read book Circular Cylinders and Pressure Vessels written by Vincenzo Vullo and published by Springer Science & Business Media. This book was released on 2013-11-29 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides comprehensive coverage of stress and strain analysis of circular cylinders and pressure vessels, one of the classic topics of machine design theory and methodology. Whereas other books offer only a partial treatment of the subject and frequently consider stress analysis solely in the elastic field, Circular Cylinders and Pressure Vessels broadens the design horizons, analyzing theoretically what happens at pressures that stress the material beyond its yield point and at thermal loads that give rise to creep. The consideration of both traditional and advanced topics ensures that the book will be of value for a broad spectrum of readers, including students in postgraduate, and doctoral programs and established researchers and design engineers. The relations provided will serve as a sound basis for the design of products that are safe, technologically sophisticated, and compliant with standards and codes and for the development of innovative applications.
Book Synopsis Water-tunnel Study of Transition Flow Around Circular Cylinders by : D. Almosnino
Download or read book Water-tunnel Study of Transition Flow Around Circular Cylinders written by D. Almosnino and published by . This book was released on 1984 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 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).
Author :Surry, Jean Publisher :Institute for Aerospace Studies, University of Toronto ISBN 13 : Total Pages :24 pages Book Rating :4.:/5 (172 download)
Book Synopsis Experimental Investigation of the Characteristics of Flow about Curved Circular Cylinders by : Surry, Jean
Download or read book Experimental Investigation of the Characteristics of Flow about Curved Circular Cylinders written by Surry, Jean and published by Institute for Aerospace Studies, University of Toronto. This book was released on 1965 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow and the associated forces on curved circular cylinders, at Reynolds Numbers between 10,000 and 1,000,000, were investigated. The shape and normal force distribution of a flexible curved cylinder were found. Flow visualisation tests and pressure surveys were made on rigid curved cylinders. A comparison was made with earlier results for infinite straight cylinders inclined to the flow. It is concluded that the curvature of a cylinder has a significant effect on the flow and pressure in the wake, and must be considered in the prediction of the aerodynamic forces on such a cylinder. (Author).
Book Synopsis Flow Structures of Circular Cylinders with a Stepwise Change of the Diameter by : Siu-kun Chan (Alex)
Download or read book Flow Structures of Circular Cylinders with a Stepwise Change of the Diameter written by Siu-kun Chan (Alex) and published by . This book was released on 1988 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
