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Elimination of vortex streets in bluff-body flows
S Dong1, G S Triantafyllou, G E Karniadakis
1Department of Mathematics, Purdue University, West Lafayette, Indiana 47907, USA. sdong@math.purdue.edu
Physical Review Letters
|June 4, 2008
Summary
We developed a technique to suppress vortex-induced vibrations in bluff bodies by disrupting the von Kármán street wake. This method uses windward suction and leeward blowing to reduce fluctuating lift forces.
Area of Science:
- Fluid Dynamics
- Acoustics and Vibration
Background:
- Vortex-induced vibrations (VIV) are a significant concern in engineering structures.
- The von Kármán vortex street is a common phenomenon in the wake of bluff bodies, leading to VIV.
Purpose of the Study:
- To present an effective technique for suppressing vortex-induced vibrations.
- To eliminate the von Kármán street in the wake of bluff bodies.
Main Methods:
- Three-dimensional computational fluid dynamics (CFD) simulations.
- Stability analysis of fluid flow.
- Investigating flow past circular cylinders (fixed and flexibly mounted).
Main Results:
- A novel technique involving combined windward suction and leeward blowing was introduced.
- This technique effectively modifies wake instability.
- Suppression of fluctuating lift forces was achieved.
Conclusions:
- The presented method offers an effective way to suppress vortex-induced vibrations.
- The findings are quantified for circular cylinders in various configurations.
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