阻塞率对表面风压系数影响的数值模拟-《建筑科学与工程学报》

文章信息/Info

Title:: Numerical Simulation of Effect of Blockage Ratio on Facade Pressure Coefficient

Author(s):: FANG Ping-zhi, GU Ming, TAN Jian-guo, LUAN Gui-han; Shanghai Typhoon Institute of China Meteorological Administration

Keywords:: TTU model; facade pressure coefficient; wall function; blockage ratio; numerical simulation; k-εturbulent model

摘要:: 以同济大学TJ-2风洞模拟的缩尺比为1∶50的B类风场为目标，给出了基于标准k-ε湍流模型的数值风场。作为数值风场的一个应用，对TTU模型的定常绕流进行模拟，并与风洞试验以及现场实测结果进行比较，重点探讨了阻塞率对表面风压系数的影响。结果表明：对于TTU模型的屋顶和背风面，阻塞率增大可导致风压系数绝对值有增大趋势；对于TTU模型的迎风面，由计算域侧面引起的阻塞率增大，导致风压系数有减小趋势，而由计算域顶面引起的阻塞率增大，则导致风压系数有增大趋势。

Abstract:: Numerical wind field based on the standard k-ε turbulent model was established. The inlet flow boundary conditions were same as the physically simulated wind field of exposure category B with the scale of 1∶50 in TJ-2 wind tunnel of Tongji University. As an application of the numerical wind field, steady state flow around the TTU model was investigated and the numerical results were compared with those from the real site and the wind tunnel. Effects of blockage ratios on the facade pressure coefficients were mainly discussed. The results show that absolute values of the pressure coefficients from the roof and leeward side of the TTU model have the increasing tendency with increasing of blockage ratio. For the upwind side of the TTU model, the pressure coefficients have the decreasing tendency with increasing of the blockage ratio caused by the lateral boundary, and have the increasing tendency with increasing of the blockage ratio caused by the top boundary of the computational domain.