A simplified model for unsteady airflow analysis in ultra-long tunnels based on the resistance compensation method  

作　　者：Xianwang Fan Huan Zhang Zhihao Wan Zhikai Liu Jiali Liu Junbin Yang Sujie Liu Jiaxuan Pu Zhaoying Wang Yan Jiang Zhangxiang Wu Shijun You Wandong Zheng 

机构地区：[1]School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China [2]CSCEC Southwest Consulting Co.,Ltd,Chengdu 610041,Sichuan,China [3]School of Architecture,Tsinghua University,Beijing 100084,China

出　　处：《Building Simulation》2024年第10期1823-1840,共18页建筑模拟（英文）

基　　金：supported by the Laboratory Basic Research Program of China State Railway Group Co.,Ltd.(L2021G011).

摘　　要：With the expansion of tunnel construction scale,accurate modeling of 3D unsteady flow fields in ultra-long tunnels requires high computational resources.In this study,a resistance compensation method based on the St and Eu similarity criterion is proposed to construct the simplified model to rapidly and precisely replicate the train-driven unstable airflow.A 6000 m ultra-long tunnel is utilized as a reference model and simplified models with the scale ratio varying from 80%to 10%are developed to assess the method performance.The multi-region dynamic mesh model is employed to simulate train tracking motion.After weighing the computational accuracy and efficiency,the results show that 20%is the optimal scale ratio.The unsteady wind speed of the simplified model deviates 6.96%from the reference model,while the simulation computation time is reduced by 85.01%.On this basis,the simplified model is applied to analyze the impacts of tunnel friction coefficients,blockage rates,train lengths and speeds,and departure intervals.The mean bias error(MBE)and Pearson correlation coefficient(PCC)are within 10%and over 0.8 respectively,confirming the reliability of the simplified model.The resistance compensation method is a crucial technique to improve the accuracy and efficiency of the unsteady flow field in ultra-long tunnels.

关 键 词：resistance compensation dynamic mesh ultra-long tunnel simplified model unsteady airflow 

分 类 号：O35[理学—流体力学]