流场物理特性在脉动风压系数估算中的应用

APPLICATION OF FLOW FIELD’S PHYSICAL PROPERTIES IN ESTIMATING FLUCTUATING WIND PRESSURE COEFFICIENT

利用数值模拟技术计算脉动风压需要进行非定常瞬态模拟,计算量过大.为了提高计算效率,文章根据准定常理论,用预测点高度的入口风速代替参考点高度风速,修正了Paterson、黄本才等人提出的脉动风压估算公式.通过由CFD模拟得到的独立柱支撑平板结构的平均风压系数、参考点风速、湍流动能等参数估算了其脉动风压系数,发现大多数工况下与风洞试验结果相吻合.研究表明,可以利用定常模拟计算结果中获得的参数估算出脉动风压系数.

To compute fluctuating wind pressure via numerical simulation technology requires unsteady transient simulation whose computation load is too huge.In order to raise computation effciency,this paper substituted reference points’ wind velocity by that of forecast points’ entrance basing on quasi-steady theory,so the estimation formula by Paterson,Huang et al.got revised.The fluctuating wind pressure coeffcients of plate structure supported by independent column were estimated according to parameters produced by CFD such as their mean wind pressure coeffcient,reference points’ wind velocity,onflow’s kinetic energy.In most cases,the outcome coincided with the result of wind tunnel test.The research shows that the parameters obtained from steady simulation result could be used to estimate the fluctuating wind pressure coeffcient.