双圆柱在不同排列方式下绕流流态模拟

双圆柱绕流伴随着流动分离、旋涡生成与脱落、旋涡间相互干扰等复杂问题,其流动形态和流动特征受圆柱相对位置影响。使用FLUENT流体软件,选取间距比1.75,2.5和4,在二维层流模型下,模拟了双圆柱串列、30°夹角错置、60°夹角错置和双圆柱并列绕流,分析了双柱绕流流态、旋涡脱落形态、升力、阻力系数随圆柱相对位置改变而变化的规律,并对比已有的试验成果和模拟成果,为桥梁建设和圆柱绕流理论研究提供了基础数据。

Simulation of flow around two cylinders under different arrangements

Water flow around two cylinders is accompanied with flow separation, vortex formation and shedding as well as mutual interference between vortexes, which is affected by cylindrical relative position. In this article, the simulation of flow around two cylinders in serial arrangement with parallelelel and staggered arrangements was done with software FLU-ENT in laminar model,the variation law of flow pattern with vortex formation and shedding as drag and lift coefficients was analyzed. Furthermore, the comparison with existing test results and simulation results was done, basic data was provided for bridge construction and theoretical research of flow around.