CAJ | 학술논문

采用有限体积法对间距比为3.0,4.0,5.0的方形四立柱涡激运动特性进行了数值研究。着重探讨了间距比对振动幅值，升力系数频谱特性，涡脱模式的影响。引入动网格技术来实现立柱和流场之间的流—固耦合模拟。研究表明：三种间距比下，流向振幅随折合速度先增大后振荡。从升力系数谱分析，在不同折合速度下，系统能量出现多个或单个峰值，但能量相对仍比较集中。当间距比较小时，由于流场的干扰作用，柱体的尾涡结构凌乱而不规则；当间距比较大时，各柱体都有各自单独的涡街，但干扰现象依然存在。
채용유한체적법대간거비위3.0,4.0,5.0적방형사립주와격운동특성진행료수치연구。착중탐토료간거비대진동폭치，승력계수빈보특성，와탈모식적영향。인입동망격기술래실현립주화류장지간적류—고우합모의。연구표명：삼충간거비하，류향진폭수절합속도선증대후진탕。종승력계수보분석，재불동절합속도하，계통능량출현다개혹단개봉치，단능량상대잉비교집중。당간거비교소시，유우류장적간우작용，주체적미와결구릉란이불규칙；당간거비교대시，각주체도유각자단독적와가，단간우현상의연존재。
The numerical simulation for vortex-induced-motion of four-square-columns with differ-ent spacing ratios 3.0, 4.0, 5.0 was carried out to study the motion characteristics. The finite volume method combined with dynamic mesh tech was adopted to realize the coupling fluid-solid interaction. The current reduced velocity ranges from 2.0 to 12.0 with uniform interval 1.0. Vibration amplitude, lift coefficient and vortex shedding model were investigated. The results show that stream-wise and transverse amplitudes generally increase with increasing reduced velocity accompanied by fluctua-tions. In the spectrum analysis of lift coefficients, at different reduced velocity, one or two peaks ap-pear, however the system energy is still concentrated relatively. Due to the mutual interferences among flow fields near each column, smaller spacing ratio gives rise to messier motion trajectory. At larger spacing ratio, each column has its own separate vortex street, still with slight interferences.