Skip to main content
    • Aa
    • Aa

On the dynamics of three-dimensional slung prisms under very low and high turbulence flows

  • Y. Jin (a1) and L. P. Chamorro (a1) (a2) (a3)

The distinctive pendulum-like oscillation and pitching patterns of cubic and rectangular slung prisms were inspected for two aspect ratios at various Reynolds numbers $Re$ under two free-stream turbulence levels. Systematic experiments were performed using high-resolution telemetry and hotwire anemometry to quantitatively characterize the dynamics of the prisms and the wake fluctuation. The results show that the dynamics of the prisms can be characterized by two distinctive regions depending on the prism shape. Specifically, in the case of cubic prisms the regions are defined by the growth rate of the pitching amplitude; whereas the dynamics of the rectangular prisms is more sensitive to the angle of attack. In particular, when the large side initially faces the flow, the regions are defined by the synchronization between the vortex shedding and pure oscillations under very low turbulence. When the smaller side initially faces the flow, the regions are defined by the equilibrium pitching position. Regardless of the geometry of the prism and flow condition the dominant oscillation frequency resulted as being close to the natural frequency of the small-amplitude pendulum-like oscillation.

Corresponding author
Email address for correspondence:
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

R. J. Adrian , C. D. Meinhart  & C. D. Tomkins 2000 Vortex organization in the outer region of the turbulent boundary layer. J. Fluid Mech. 422, 154.

Y. S. Baik , L. P. Bernal , K. Granlund  & M. V. Ol 2012 Unsteady force generation and vortex dynamics of pitching and plunging aerofoils. J. Fluid Mech. 709, 3768.

L. Cicolani , C. Ivler , C. Ott , R. Raz  & A. Rosen 2015 Rotational stabilization of cargo container slung loads. J. Am. Helicopter Soc. 60 (4), 113.

F. Flemming  & C. H. K. Williamson 2005 Vortex-induced vibrations of a pivoted cylinder. J. Fluid Mech. 522, 215252.

R. Govardhan  & C. H. K. Williamson 2000 Modes of vortex formation and frequency response of a freely vibrating cylinder. J. Fluid Mech. 420, 85130.

D. I. Greenwell 2014 Geometry effects on autorotation of rectangular prisms. J. Wind Engng Ind. Aerodyn. 132, 92100.

J. D. Hobeck  & D. J. Inman 2014 A distributed parameter electromechanical and statistical model for energy harvesting from turbulence-induced vibration. Smart Mater Struct. 23 (11), 115003.

P. A. Irwin 2008 Bluff body aerodynamics in wind engineering. J. Wind Engng Ind. Aerodyn. 96 (6), 701712.

R. T. Jantzen , K. Taira , K. O. Granlund  & M. V. Ol 2014 Vortex dynamics around pitching plates. Phys. Fluids 26 (5), 053606.

Y. Jin , S. Ji , B. Liu  & L. P. Chamorro 2016b On the role of thickness ratio and location of axis of rotation in the flat plate motions. J. Fluids Struct. 64, 127137.

Y. Jin , H. Liu , R. Aggarwal , A. Singh  & L. P. Chamorro 2016c Effects of freestream turbulence in a model wind turbine wake. Energies 9 (10), 830; doi:10.3390/en9100830.

A. Khalak  & C. H. K. Williamson 1999 Motions, forces and mode transitions in vortex-induced vibrations at low mass-damping. J. Fluids Struct. 13 (7), 813851.

C. W. Knisely 1990 Strouhal numbers of rectangular cylinders at incidence: a review and new data. J. Fluids Struct. 4 (4), 371393.

Y. Nakamura  & Y. Ohya 1984 The effects of turbulence on the mean flow past two-dimensional rectangular cylinders. J. Fluid Mech. 149, 255273.

A. Nemes , J. Zhao , D. L. Jacono  & J. Sheridan 2012 The interaction between flow-induced vibration mechanisms of a square cylinder with varying angles of attack. J. Fluid Mech. 710, 102130.

K. Onoue , A. Song , B. Strom  & K. S. Breuer 2015 Large amplitude flow-induced oscillations and energy harvesting using a cyber-physical pitching plate. J. Fluids Struct. 55, 262275.

D. T. Prosser  & M. J. Smith 2015 A physics-based, reduced-order aerodynamics model for bluff bodies in unsteady, arbitrary motion. J. Am. Helicopter Soc. 60 (3), 115.

D. T. Prosser  & M. J. Smith 2016 Numerical characterization of three-dimensional bluff body shear layer behaviour. J. Fluid Mech. 799, 126.

R. Raz , A. Rosen , L. S. Cicolani  & J. Lusardi 2014 Using wind tunnel tests for slung-load clearance, part 1: the conex cargo container. J. Am. Helicopter Soc. 59 (4), 112.

T. Sarpkaya 2004 A critical review of the intrinsic nature of vortex-induced vibrations. J. Fluids Struct. 19 (4), 389447.

S. Sen  & S. Mittal 2011 Free vibration of a square cylinder at low Reynolds numbers. J. Fluids Struct. 27 (5), 875884.

E. H. Smith 1971 Autorotating wings: an experimental investigation. J. Fluid Mech. 50 (3), 513534.

T. Tamura  & T. Miyagi 1999 The effect of turbulence on aerodynamic forces on a square cylinder with various corner shapes. J. Wind Engng Ind. Aerodyn. 83 (1), 135145.

M. Tatsuno , T. Takayama , H. Amamoto  & K. Ishi-i 1990 On the stable posture of a triangular or a square cylinder about its central axis in a uniform flow. Fluid Dyn. Res. 6, 201207.

T. Von Kármán 1938 Airfoil theory for non-uniform motion. J. Aero. Sci. 5 (10), 379390.

C. H. K. Williamson  & R. Govardhan 2004 Vortex-induced vibrations. Annu. Rev. Fluid Mech. 36 (1), 413455.

X. Wu , F. Ge  & Y. Hong 2012 A review of recent studies on vortex-induced vibrations of long slender cylinders. J. Fluids Struct. 28, 292308.

T. G. Zaki  & M. Gad-El-Hak 1994 Numerical and experimental investigation of flow past a freely rotatable square cylinder. J. Fluids Struct. 8 (7), 555582.

J. Zhao , J. S Leontini , D. L. Jacono  & J. Sheridan 2014 Fluid–structure interaction of a square cylinder at different angles of attack. J. Fluid Mech. 747, 688721.

M. Zhao 2015 Flow-induced vibrations of square and rectangular cylinders at low Reynolds number. Fluid Dyn. Res. 47 (2), 025502.

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? *



Full text views

Total number of HTML views: 10
Total number of PDF views: 114 *
Loading metrics...

Abstract views

Total abstract views: 278 *
Loading metrics...

* Views captured on Cambridge Core between 7th March 2017 - 22nd August 2017. This data will be updated every 24 hours.