Skip to main content
×
Home
    • Aa
    • Aa
  • Get access
    Check if you have access via personal or institutional login
  • Cited by 182
  • Cited by
    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    McClure, Jeffrey and Yarusevych, Serhiy 2016. Vortex shedding and structural loading characteristics of finned cylinders. Journal of Fluids and Structures, Vol. 65, p. 138.


    Morton, C. Yarusevych, S. and Scarano, F. 2016. A tomographic particle image velocimetry investigation of the flow development over dual step cylinders. Physics of Fluids, Vol. 28, Issue. 2, p. 025104.


    Triantafyllou, Michael S. Bourguet, Rémi Dahl, Jason and Modarres-Sadeghi, Yahya 2016. Springer Handbook of Ocean Engineering.


    Visakh, M. G. Saha, Arun K. and Muralidhar, K. 2016. Effect of spanwise shear on flow past a square cylinder at intermediate Reynolds numbers. Physics of Fluids, Vol. 28, Issue. 3, p. 033602.


    Ben, An-Qing and Dou, Hua-Shu 2015. Simulation and Stability Study of the Flow Around a Cylinder in Infinite Domain. Procedia Engineering, Vol. 126, p. 68.


    Bhattacharya, S. and Gregory, James W. 2015. Investigation of the cylinder wake under spanwise periodic forcing with a segmented plasma actuator. Physics of Fluids, Vol. 27, Issue. 1, p. 014102.


    Cao, Yong and Tamura, Tetsuro 2015. Numerical investigations into effects of three-dimensional wake patterns on unsteady aerodynamic characteristics of a circular cylinder at Re=1.3×105. Journal of Fluids and Structures, Vol. 59, p. 351.


    Chang, Ni-Bin James Crawford, A. Mohiuddin, Golam and Kaplan, Josh 2015. Low flow regime measurements with an automatic pulse tracer velocimeter (APTV) in heterogeneous aquatic environments. Flow Measurement and Instrumentation, Vol. 42, p. 98.


    Dou, Hua-Shu and Ben, An-Qing 2015. Simulation and instability investigation of the flow around a cylinder between two parallel walls. Journal of Thermal Science, Vol. 24, Issue. 2, p. 140.


    He, Guo-Sheng and Wang, Jin-Jun 2015. Flat plate boundary layer transition induced by a controlled near-wall circular cylinder wake. Physics of Fluids, Vol. 27, Issue. 2, p. 024106.


    McClure, J. Morton, C. and Yarusevych, S. 2015. Flow development and structural loading on dual step cylinders in laminar shedding regime. Physics of Fluids, Vol. 27, Issue. 6, p. 063602.


    Miau, J.J. Leu, T.S. Yu, J.M. Tu, J.K. Wang, C.T. Lebiga, V. Mironov, D. Pak, A. Zinovyev, V. and Chung, K.M. 2015. Mems thermal film sensors for unsteady flow measurement. Sensors and Actuators A: Physical, Vol. 235, p. 1.


    Noto, Katsuhisa 2015. Direct Numerical Simulation of Air Heated Cylinder Wake in Transitional State, Part III: TemperatureT* in Turbulence Anisotropy (TA), Turbulence ofT*, Discontinuity and Dislocation B, and Their Causes inT* with Laminar PSD Gradient, PSD Oscillation, and Strongly Active Scalar. Numerical Heat Transfer, Part B: Fundamentals, Vol. 68, Issue. 3, p. 257.


    Yang, Jianzhi Liu, Minghou Wu, Guang Liu, Quan and Zhang, Xintai 2015. Low-frequency characteristics in the wake of a circular disk. Physics of Fluids, Vol. 27, Issue. 6, p. 064101.


    Yang, Dan Pettersen, Bjørnar Andersson, Helge I. and Narasimhamurthy, Vagesh D. 2015. Analysis of vortex splitting characteristics in the wake of an inclined flat plate using Hilbert–Huang transform. Acta Mechanica, Vol. 226, Issue. 4, p. 1085.


    Zhao, Ming 2015. Numerical simulation of vortex-induced vibration of a circular cylinder in a spanwise shear flow. Physics of Fluids, Vol. 27, Issue. 6, p. 063101.


    Morton, C. and Yarusevych, S. 2014. On vortex shedding from low aspect ratio dual step cylinders. Journal of Fluids and Structures, Vol. 44, p. 251.


    Noto, Katsuhisa 2014. Direct Numerical Simulation of Air Heated Cylinder Wake in Transitional State. Part I: Cylinder Heating Effect on Strong Turbulence Anisotropy (STA), and Determination of STA Suppression. Numerical Heat Transfer, Part B: Fundamentals, Vol. 66, Issue. 1, p. 43.


    Noto, Katsuhisa 2014. Direct Numerical Simulation of Air Heated Cylinder Wake in Transitional State. Part II: Visualization and Mechanism of Unified 3-D Streaklines, Vortex Dislocation, and Turbulence Wreck. Numerical Heat Transfer, Part B: Fundamentals, Vol. 66, Issue. 1, p. 77.


    Radi, Alexander Lo Jacono, David and Sheridan, John 2014. A device to achieve low Reynolds numbers in an open surface water channel. Experiments in Fluids, Vol. 55, Issue. 5,


    ×
  • Journal of Fluid Mechanics, Volume 243
  • October 1992, pp. 393-441

The natural and forced formation of spot-like ‘vortex dislocations’ in the transition of a wake

  • C. H. K. Williamson (a1)
  • DOI: http://dx.doi.org/10.1017/S0022112092002763
  • Published online: 01 April 2006
Abstract

The three-dimensional transition of the flow behind a bluff body is studied, with an emphasis placed on the evolution of large-scale structures in the wake. It has previously been found that there are two fundamental modes of three-dimensional vortex shedding in the wake of a circular cylinder (each mode being dependent on the range of Reynolds number), with a spanwise lengthscale of the same order as the primary streamwise wavelength of the vortex street. However. it is shown in the present study that the wake transition also involves the appearance of large-scale spot-like ‘vortex dislocations’, that grow downstream to a size of the order of 10–20 primary wavelengths. Vortex dislocations are generated between spanwise vortex-shedding cells of different frequency. The presence of these dislocations explains the large intermittent velocity irregularities that were originally found by Roshko (1954) and later by Bloor (1964) to characterize transition. The presence of these vortex dislocations in wake transition is largely responsible for the break-up to turbulence of the wake as it travels downstream.

In order to study their evolution in detail, dislocations have been (passively) forced to occur at a local spanwise position with the use of a small ring disturbance. It is found that ‘two-sided’ dislocations are stable in a symmetric in-phase configuration, and that they induce quasi-periodic velocity spectra and (beat) dislocation-frequency oscillations in the near wake. Intrinsic to these dislocations is a mechanism by which they spread rapidly in the spanwise direction, involving helical twisting of the vortices and axial core flows. This is felt to be a fundamental mechanism by which vortices develop large-scale distortions in natural transition. As the wake travels downstream, the energy at the low dislocation frequency decays slowly (in contrast to the rapid decay of other frequencies), leaving the downstream wake dominated by the large dislocation structures. Distinct similarities are found between the periodic forced dislocations and the intermittent dislocations that occur in natural transition. Further similarities of dislocations in different types of flow suggest that vortex or phase dislocations could conceivably be a generic feature of transition in all shear flows.

Copyright
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×
MathJax