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- W2471405151 abstract "Laminar and large-eddy-simulation (LES) calculations with the dynamic Smagorinsky model evaluate the flow and force on an oscillating cylinder of diameter D = 2R in otherwise calm fluid, for β = D2/νT in the range 197–61400 and Keulegan–Carpenter number K = UmT/D in the range 0.5–8 (ν kinematic viscosity, T oscillation period, Um maximal velocity). Calculations resolving the streakline patterns of the Honji instability exemplify the local flow structures in the cylinder boundary layer (β ∼197–300, K ∼ 2) but show that the drag and inertia force are not affected by the instability. The present force calculations conform with the classical Stokes–Wang solution for all cases below flow separation corresponding to K 2 has strong implication for the force on the cylinder. Present calculations of the force coefficients forK up to 4 and β = 11240 are in agreement with experiments by Otter (Appl Ocean Res 12:153–155, 1990). Drag coeffients when flow separation occurs are smaller than found in U-tube experiments. Inertia coefficients show strong decline for largeK (up to 8) and moderate β = 1035 but is close to unity forK = 4 and β = 11240. The finest grid has 2.2 × 106 cells, finest radial r/R = 0.0002, number of points along the cylinder circumference of 180, z/R = 0.044 and a time step of 0.0005T ." @default.
- W2471405151 created "2016-07-22" @default.
- W2471405151 creator A5037001093 @default.
- W2471405151 date "2013-01-01" @default.
- W2471405151 modified "2023-09-24" @default.
- W2471405151 title "Instabilities around an oscillating cylinder and empirical study of internal waves" @default.
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