Physics of Fluids, Год журнала: 2025, Номер 37(4)
Опубликована: Апрель 1, 2025
This work proposed a passive method by arranging several small circular rods to control the rotational dynamics of square cylinder. Two-dimensional numerical investigations were conducted at low Reynolds number 120 and in wide reduced velocity range Ur = 2–20. Effects rod arrangement as well gap distance between cylinder examined. For single cylinder, critical 6.5 is identified. Rotary angles remain near zero 2–6, while sharp rise occurs 6.5, reaching peak 38.05° 8, after which it slightly declines. The frequencies follow two different growth rates before velocity. When eight are evenly arranged around rotary structure do not exceed 5° 90% reductions achieved compared with showing most effective suppression. However, associated drag coefficients significantly increased due projected area in-line direction frequent separation reattachment behaviors. Optimal when placed windward leeward position, helpful reduce local high pressure recover base pressure, respectively. Bifurcation, characterized non-zero time-averaged angle, appears side-by-side position. After bifurcation, these stay below causing an asymmetrical configuration thus flow distributions. A recommended half length edge under across entire range, indicating perfectly excellent rotation At this configuration, no vortex shedding field stable symmetry.
Язык: Английский