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- W2020649394 abstract "Successful numerical simulation can reveal important flow characteristics and information which are extremely difficult to obtain experimentally. A two-dimensional finite volume method with unstructured mesh is used to simulate cross-flow around three equal diameter cylinders arranged in an equilateral-triangular interact manner for two incidence angles, α=0∘ and α=180∘. Special attention is paid on the variation of flow pattern characteristics among the cylinders, force characteristics and Strouhal number of each cylinder with nine spacing ratios (L/D) ranging from 1.5 to 7 at Re = 100 and 200, respectively. Three distinct flow patterns are revealed: (1) At α=0∘ (inverted-T shaped arrangement), the biased flow generated behind the side by side downstream cylinders in small spacing ratio is not bistable but monostable, which means that the biased flow phenomenon once formed, it remained in this pattern. Furthermore, Reynolds number has significant impact on the spacing ratio where the biased pattern disappears, it disappears at L/D ≥ 2 for Re = 100 but L/D ≥ 3 for Re = 200. The biased phenomena results in a large difference in the mean and r-m-s drag coefficients for the side by side downstream cylinders. (2) An interaction force exists in the gap of the side by side cylinders that may be an attractive or a repulsive force dominated by the pressure distribution in the gap of the cylinders. (3) At small spacing ratio, the fluctuating forces on downstream cylinder(s) are very small and far less than that on a single cylinder due to the proximity effect. But at large spacing ratio, they are much larger than that on a single cylinder due to the fluctuation of the shear layer from the upstream cylinder(s). Furthermore, the spacing ratio where the effect of the fluctuation reaches its maximum is related to the Reynolds number, L/D=4 at Re = 200 but L/D=5 at Re = 100." @default.
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- W2020649394 date "1998-09-01" @default.
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- W2020649394 title "A model of myoelectrical activity recording after small bowel transplantation" @default.
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- W2020649394 doi "https://doi.org/10.1016/s0041-1345(98)00749-0" @default.
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