FLOW EFFECT AROUND TWO SQUARE CYLINDERS ARRANGED SIDE BY SIDE USING LATTICE BOLTZMANN METHOD

Yong Rao, Yushan Ni () and Chaofeng Liu
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Yong Rao: Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, P. R. China
Yushan Ni: Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, P. R. China
Chaofeng Liu: Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, P. R. China

International Journal of Modern Physics C (IJMPC), 2008, vol. 19, issue 11, 1683-1694

Abstract: The flow around two square cylinders arranged side by side has been investigated through lattice Boltzmann method under different Reynolds numbers and various space ratios (s = d/D,dis the separation distance between two cylinders,Dis the characteristic length) from 1.0, 1.1 to 2.7, including 18 space ratios. It is found that the flip-flop regime occurs at small space ratios and the synchronized regime occurs at large space ratios. Wide and narrow wakes at small spacing are formed and intermittently change behind the cylinders, and the biased flow in the gap is bistable. The frequency of vortex shedding is different in two wakes. The upper frequency is smaller than the lower frequency for small space ratios(s 140because of the nonlinear interaction between the wakes, and the instability of flow becomes stronger with the increase in Reynolds numbers. On the other hand, the vortex shedding type from the cylinder occurs in-phase whens

Keywords: Lattice Boltzmann; square cylinder; space ratios; drag coefficient; lift coefficient (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0129183108013217

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