摘要
利用Fluent软件模拟雷诺数为200时不同间距比G/D和直径比d/D情况下的圆柱绕流现象。根据模拟结果分析G/D和d/D对圆柱体的涡脱落形态,大、小柱体的升力,阻力系数和St数的影响,结果表明涡脱落形态随着G/D和d/D的变化呈现不同的形式,在G/D小于临界间距比时呈现单一涡脱落形态,在G/D大于临界间距比时,呈现双旋涡脱落形态;临界间距比随着d/D增大而增大。在临界间距比附近大、小柱体的升力和阻力系数值及St数变化较大,大、小柱体的St数具有相同的变化规律,St随着d/D的增大而减小。
In the paper, viscous flow past circular cylinders with different diameter ratio and spacing ratio is numerically simulated by Fluent software, when Re= 200. Effects of G/D and diD on vortex shedding characteristics, lift and drag coefficients of large and small cylinders, vortex shedding frequency are inves- tigated based on the obtained simulation results. The analyses show that vortex shedding characteristics display different forms with different gap ratio, when gap is smaller than the critical gap, it displays sin- gle-wake shedding mode; when gap is larger than the critical gap, it displays two-wakes shedding mode; the critical gap increases as diD increases; lift and drag coefficients of large and small cylinders as well as St number change sharply near the critical gap; St number of large and small cylinders have same variation regular, St number decreases as diD increases.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第7期160-165,共6页
Periodical of Ocean University of China
基金
山东省科技发展计划项目(2008GGB01099)资助
关键词
不等直径
串列
升力
阻力系数
涡脱落形态
涡脱落频率
different diameter
tandem
lift and drag eoefficient
vorfex shedding characteristics
vortexshedding frequency
