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Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

Numerical simulation of oscillating-cylinder effects on a downstream cylinder wake using lattice Boltzmann method

pages 1227-1232
DOI: 10.1615/TSFP3.2050
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RESUMO

This paper proposes to use a newly developed lattice Boltzmann technique to simulate the wake of a streamwise oscillating cylinder in the presence of a downstream stationary cylinder. The oscillating frequency ratio fe/fs, varies between 0 and 1.8, where fe is the oscillating frequency of the upstream cylinder and fs is the natural vortex shedding frequency of an isolated stationary cylinder, and the oscillating amplitude A is fixed at 0.5 cylinder diameter, D. Three typical flow structures, depending on fe/fs have been identified at the cylinder center-to-center spacing L/D = 3.5, which are in excellent agreement with experimental data. The flow structure remains unchanged for the same fe/fs as L/D is increased to 6.0, but changes drastically at a low fe/fs for L/D = 2.0. It is proposed that, beyond a critical L/D, vortices are formed between the cylinders and the flow structure is independent of L/D. But, below the critical L/D, the free shear layers separated from the upstream cylinder may reattach on the downstream cylinder, thus leading to a different flow structure from that above the critical L/D despite of the same fe/fs and A/D. The lift and drag coefficients associated with the two cylinders are examined in detail for each flow structure.

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