Measurements were made of the circumferential pressure distributions around two cylinders of finite height h and diameter d, spaced a distance s apart and vertically immersed in a turbulent boundary layer. The angle of attack φ and the dimensionless spacing s/d were varied. Drag and lift characteristics of both cylinders were classified into three regions divided by two zero-lift lines, namely 0 ≲ φ ≲ 30 deg, 30 ≲ φ ≲ 120 deg, and 120 ≲ φ ≲ 180 deg, in which interference between the two cylinders was found to be almost negligible for s/d ≳ 4.0, except for an influence in the wake region of the upstream cylinder.
Interference Between Two Circular Cylinders of Finite Height Vertically Immersed in a Turbulent Boundary Layer
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Taniguchi, S., Sakamoto, H., and Arie, M. (December 1, 1982). "Interference Between Two Circular Cylinders of Finite Height Vertically Immersed in a Turbulent Boundary Layer." ASME. J. Fluids Eng. December 1982; 104(4): 529–536. https://doi.org/10.1115/1.3241901
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