基于RNG k-ε模型的竖板绕流数值模拟  

Numerical simulation of flow around a vertical plate using RNG k-ε turbulence model

作　　者：吴永诚[1] 苗峰[2] 黎义斌[3] 闫幼锋[1] 

机构地区：[1]兰州理工大学设计艺术学院,甘肃兰州730050 [2]兰州理工大学土木工程学院,甘肃兰州730050 [3]兰州理工大学能源与动力学院,甘肃兰州730050

出　　处：《四川建筑科学研究》2014年第4期21-25,共5页Sichuan Building Science

基　　金：国家自然科学基金资助项目(51166009)

摘　　要：作为薄矩形柱类高层建筑绕穿流动的基础研究之一,采用简化的直通道内置竖板二维平面空气绕流模型为研究对象。基于有限体积法和RNG k-ε湍流模型,对不同风级作用下的长宽比D/B=0.1的竖板流动进行非定常数值模拟。计算结果揭示了竖板空气绕流尾涡的形成、脱落及消失的周期性过程。在Re=4.42×104和Re=4.62×104区间尾涡无明显脱落,当雷诺数大于或等于4.62×104时,出现尾涡的生成及脱落消失过程。计算并分析了竖板表面不同位置的压力分布和风载体型系数,计算结果与相关文献结论进行了对比。The research for the simplified model of air flow around a 2-D planar vertical plate in a straight channel is carried out.This work is one of the basic researches about the wake flow structure of the flow around a thin pierced rectangular column high rise building.The unsteady numerical simulation method based on the Finite Volume Method and the RNG k-ε turbulence model for the flow field around the vertical plate （length-width ratio D/B =0.1） under different wind scales are made.The calculation results reveal the periodic process of the wake vortexes generation,shedding and disappearance of the flow.There is no obvious wake vortexes shedding between the Reynolds number of 4.42 × 104 and 4.62 × 104,but the process of wake vortexes＇ generation and disappearance will appear when the Reynolds number is higher than or equal to 4.62 × 104.The pressure distribution on the surface of the vertical plate and the figure coefficient of wind load of this model are calculated and analysed.Furthermore,the calculation results and related articles are compared.

关 键 词：薄矩形柱 直通道竖板 空气平面绕流 RNG κ-ε模型 尾涡 数值模拟 

分 类 号：TU973.213[建筑科学—结构工程]