109 Fluid Forces Acting on Two Side-by-Side Circular Cylinders

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Fluid forces acting on two stationary circular cylinders in a side-by-side arrangement were investigated experimentally in a uniform flow at a Reynolds number of 5.5×(10)^4. For a spacing ratio of T/D<1.5 (T, spacing between the cylinders; D, diameter), the gap flow was biased to one side, resulting in the formation of a narrower wake behind one cylinder and a wider wake behind the other. Steady and fluctuating fluid forces acting on the cylinders were decomposed for the narrower wake and the wider wake flow patterns. For T/D>0.20,the action of lift forces on both cylinders was in an outward direction (repulsive); however, for T/D=0.10,the action of lift force on the cylinder associated with the narrower wake was inward and that on the other cylinder was outward. Steady drag and fluctuating fluid forces were comparatively higher for the narrower wake. For T/D=0.10∿0.20 and 1.2∿1.50,the mean drag induced by the narrower wake and the wider wake was greater than that of a single cylinder.
一般社団法人日本機械学会の論文
2002-10-05