摘要
以某地铁站台为例,利用计算流体力学方法,采用标准k-ε模型、RNG k-ε模型、混合长度零方程模型、Chen零方程模型以及v2f模型,对其通风系统下站台、站厅内的温度场和速度场进行数值模拟。通过对不同模型下结果的比较分析,发现Chen零方程湍流模型在较少的收敛迭代次数下,能够得到与标准k-ε模型和RNG k-ε模型较为接近的流场和温度场,而混合长度零方程模型和近年来兴起的v2f模型则与其他模型的计算结果有较大差异。结果表明,在对地铁站台建立热环境数值模型时,湍流模型的选择也需谨慎。
For a subway station in Tianjin, temperature fields and velocity fields were simulated by a computational fluid dy-namics （CFD） method adopting 5 turbulence models including the standard k-emodel, RNG k-emodel, mixing length zero e- quation model, Chen＇ s zero equation model and v2f model. A comparison between the simulated resuks showed that the flow field and temperature field obtained by Chen＇ s zero equation turbulence model was close to that by the standard k-emodel and RNG k-smodel with less iteration steps while the results by mixing length equation model and v2 f models were distinct from those by the above three models. Therefore, it should be careful to choose turbulence models when thermal environment is simulated by CFD method.
出处
《都市快轨交通》
北大核心
2012年第2期49-52,共4页
Urban Rapid Rail Transit
基金
中央高校基本科研业务项目(xjj20100138)
关键词
地铁
站台
计算流体力学
湍流模型
热环境
数值模拟
subway stations
CFD
turbulence models
thermal environment
numerical simulation
