Modes of Turbulent Vortex Shedding from a Pipe-Jet System in a Cross-Flow

AIAA Journal ◽  
1979 ◽  
Vol 17 (3) ◽  
pp. 315-317
Author(s):  
John W. Trischka
Keyword(s):  
Vortex Shedding ◽  
Cross Flow ◽  
Turbulent Vortex ◽  
Turbulent Vortex Shedding

Lidar observations of turbulent vortex shedding by an isolated topographic feature

1996 ◽  
Vol 80 (1-2) ◽  
pp. 95-108 ◽  
Author(s):  
William P. Hooper ◽  
Jeffrey E. James ◽  
Richard J. Lind
Keyword(s):  
Vortex Shedding ◽  
Topographic Feature ◽  
Turbulent Vortex ◽  
Turbulent Vortex Shedding ◽  
Lidar Observations

Computation of turbulent vortex shedding

2005 ◽  
Vol 37 (5) ◽  
pp. 408-425 ◽  
Author(s):  
B. A. Younis ◽  
V. P. Przulj
Keyword(s):  
Vortex Shedding ◽  
Turbulent Vortex ◽  
Turbulent Vortex Shedding

scholarly journals Vortex-induced vibrations of a long flexible cylinder in shear flow

2011 ◽  
Vol 677 ◽  
pp. 342-382 ◽  
Author(s):  
REMI BOURGUET ◽  
GEORGE E. KARNIADAKIS ◽  
MICHAEL S. TRIANTAFYLLOU
Keyword(s):  
Shear Flow ◽  
Vortex Shedding ◽  
Cross Flow ◽  
Maximum Velocity ◽  
Travelling Wave ◽  
Transition To Turbulence ◽  
Wave Component ◽  
Flexible Cylinder ◽  
Vortex Induced Vibrations ◽  
Lock In

We investigate the in-line and cross-flow vortex-induced vibrations of a long cylindrical tensioned beam, with length to diameter ratio L/D = 200, placed within a linearly sheared oncoming flow, using three-dimensional direct numerical simulation. The study is conducted at three Reynolds numbers, from 110 to 1100 based on maximum velocity, so as to include the transition to turbulence in the wake. The selected tension and bending stiffness lead to high-wavenumber vibrations, similar to those encountered in long ocean structures. The resulting vortex-induced vibrations consist of a mixture of standing and travelling wave patterns in both the in-line and cross-flow directions; the travelling wave component is preferentially oriented from high to low velocity regions. The in-line and cross-flow vibrations have a frequency ratio approximately equal to 2. Lock-in, the phenomenon of self-excited vibrations accompanied by synchronization between the vortex shedding and cross-flow vibration frequencies, occurs in the high-velocity region, extending across 30% or more of the beam length. The occurrence of lock-in disrupts the spanwise regularity of the cellular patterns observed in the wake of stationary cylinders in shear flow. The wake exhibits an oblique vortex shedding pattern, inclined in the direction of the travelling wave component of the cylinder vibrations. Vortex splittings occur between spanwise cells of constant vortex shedding frequency. The flow excites the cylinder under the lock-in condition with a preferential in-line versus cross-flow motion phase difference corresponding to counter-clockwise, figure-eight orbits; but it damps cylinder vibrations in the non-lock-in region. Both mono-frequency and multi-frequency responses may be excited. In the case of multi-frequency response and within the lock-in region, the wake can lock in to different frequencies at various spanwise locations; however, lock-in is a locally mono-frequency event, and hence the flow supplies energy to the structure mainly at the local lock-in frequency.

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