The evolution process and turbulence properties of a transversely oscillating flow induced by a fluidic oscillator are studied in a gravity-driven water tunnel. A planar jet is guided to impinge a specially designed crescent surface of a target blockage that is enclosed in a cavity of a fluidic oscillator. The geometric configuration of the cavity transforms the inherent stability characteristics of the jet from convective instability to absolute instability, so that the jet precedes the persistent back and forth swinging in the cavity. The swinging jet is subsequently directed through two passages and issued alternatively out of the fluidic oscillator. Two short plates are installed near the exits of the alternatively issuing pulsatile jets to deflect the jets toward the central axis. The deflected jets impinge with each other and form a pair of counter-rotating vortices in the near wake of the oscillator with a stagnation point at the impingement point. The stagnation point of the counter-rotating vortex pair moves back and forth transversely because of the phase difference existing between the two issued jets. The merged flow evolving from the counter-rotating vortices formed by the impingement of the two pulsatile jets therefore presents complex behavior of transverse oscillation. The topological models corresponding to the flow evolution are constructed to illustrate the oscillation process of the oscillating flow. Significant momentum dispersion and large turbulence intensity are induced by the transverse oscillation of the merged flow. The statistical turbulence properties show that the Lagrangian integral time and length scales of the turbulence eddies (the fine-scale structure) produced in the oscillating flow are drastically reduced.
Skip Nav Destination
e-mail: rfhuang@mail.ntust.edu
Article navigation
August 2007
Technical Papers
Evolution and Turbulence Properties of Self-Sustained Transversely Oscillating Flow Induced by Fluidic Oscillator
Rong Fung Huang,
e-mail: rfhuang@mail.ntust.edu
Rong Fung Huang
National Taiwan University of Science and Technology
, Taipei, Taiwan 10672, Republic of China
Search for other works by this author on:
Kuo Tong Chang
Kuo Tong Chang
Mingchi University of Technology, Taipei
, Taiwan 24306, Republic of China
Search for other works by this author on:
Rong Fung Huang
National Taiwan University of Science and Technology
, Taipei, Taiwan 10672, Republic of Chinae-mail: rfhuang@mail.ntust.edu
Kuo Tong Chang
Mingchi University of Technology, Taipei
, Taiwan 24306, Republic of ChinaJ. Fluids Eng. Aug 2007, 129(8): 1038-1047 (10 pages)
Published Online: February 3, 2007
Article history
Received:
April 4, 2006
Revised:
February 3, 2007
Citation
Fung Huang, R., and Tong Chang, K. (February 3, 2007). "Evolution and Turbulence Properties of Self-Sustained Transversely Oscillating Flow Induced by Fluidic Oscillator." ASME. J. Fluids Eng. August 2007; 129(8): 1038–1047. https://doi.org/10.1115/1.2746905
Download citation file:
Get Email Alerts
Switching Events of Wakes Shed From Two Short Flapping Side-by-Side Cylinders
J. Fluids Eng (May 2025)
Related Articles
A Comparison of Single and Multiphase Jets in a Crossflow Using Large Eddy Simulations
J. Eng. Gas Turbines Power (January,2007)
Cavitation Inception in the Wake of a Jet-Driven Body
J. Fluids Eng (November,2009)
Characteristics of Small Vortices in a Turbulent Axisymmetric Jet
J. Fluids Eng (May,2006)
Local Convective Heat Transfer From a Constant Heat Flux Flat Plate Cooled by Synthetic Air Jets
J. Heat Transfer (October,2006)
Related Proceedings Papers
Related Chapters
Pulsating Supercavities: Occurrence and Behavior
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Cavitating Structures at Inception in Turbulent Shear Flow
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
On the Dispersion Relation of a Vortex Cavity
Proceedings of the 10th International Symposium on Cavitation (CAV2018)