摘要
为了获取准确的水电工程引水隧洞施工通风瞬态流场信息并且提高计算效率,基于Realizable k-ε两方程湍流模型建立引水隧洞施工通风三维非稳态混合LES/RANS模型,并结合某引水隧洞施工通风过程进行数值模拟,借助现场实测风速数据对数值模拟结果进行验证,同时将混合LES/RANS模型的模拟结果与RANS模型和LES模型的模拟结果进行对比。结果表明:混合LES/RANS数值模拟结果与现场实测数据较为吻合,其平均相对误差仅为4. 9%。混合LES/RANS方法仅需1 163 996个计算网格即可获得准确的瞬态风流场扩散规律,而LES方法所需网格数量近似为前者的2倍。混合LES/RANS方法可以为水电工程引水隧洞的施工通风数值模拟研究提供重要的理论与技术支撑。
In order to obtain accurate information of the transient flow field of the construction ventilation for water diversion tunnel of hydropower project and improve the relevant calculation efficiency,a 3-D unsteady hybrid LES/RANS model for the construction ventilation of water diversion tunnel is established on the basis of the realizable k-εtwo equation turbulence model,and then a numerical simulation is made on the construction ventilation process of a water diversion tunnel;for which the numerical simulation result is verified by means of the in situ measured ventilation velocity,meanwhile,the simulated result from the hybrid LES/RANS model is compared with the results from both RANS model and LES model.The result shows that the simulated result from the hybrid LES/RANS model is more coincided with the in situ measured data with the mean relative error of only 4.9%.Only with 1 163 996 computational grids,the accurate transient flow field diffusion law can be obtained by the hybrid LES/RANS model,but the number of the computational grids required for the LES method is approximately twice the former.The hybrid LES/RANS model can provide important theoretical and technical supports for the study on the numerical simulation of the construction ventilation of water diversion tunnel for hydropower project.
作者
王晓玲
刘长欣
禹旺
刘震
吕鹏
WANG Xiaoling;LIU Changxin;YU Wang;LIU Zhen;LV Peng(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)
出处
《水利水电技术》
CSCD
北大核心
2018年第10期93-99,共7页
Water Resources and Hydropower Engineering
基金
国家自然科学基金(51679165)
国家自然科学基金创新研究群体项目(51621092)
国家重点研发计划(2016YFC0401806)
关键词
引水隧洞
施工通风
数值模拟
混合LES/RANS方法
风流场分布
water diversion tunnel
construction ventilation
numerical simulation
hybrid LES/RANS method
airflow field distribution
作者简介
王晓玲(1968—),女,教授,博士研究生导师,博士,研究方向为水利水电工程施工通风与模拟研究。E-mail:wangxl@tju.edu.cn。
