突然开孔时孔口气流动力特性参数的数值模拟  

NUMERICAL SIMULATION OF FLOW DYNAMICAL PARAMETERS AT SUDDEN OPENING

作　　者：卢旦[1] 楼文娟[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310027

出　　处：《工程力学》2006年第10期55-60,共6页Engineering Mechanics

基　　金：国家自然科学基金(50378085)

摘　　要：建筑物突然开孔时瞬态内压响应的规律可以用一个二阶非线性常微分方程来描述,由于开孔形状和孔边物理特征的复杂性,采用风洞试验获取方程中各项系数的方法往往比较困难。首先利用计算流体动力学的方法,模拟建筑物突然开孔瞬时的流场变化,获得风致内压的Helmholtz频率和孔口气流的等效线性阻尼。再由这两个参数计算得到的内压增益并与风洞试验结果相比较,二者结果吻合较好,表明数值计算能够准确地模拟突然开孔结构孔口处的气体流动状态。其次,利用孔口气流振荡曲线,采用参数拟合的方法进一步获得了内压传播方程中的各特征参数。The transient response of internal pressure following a sudden openning was described by a second-order, non-liner, ordinary differential equation. Because of the complexity of the geometry and the opening configuration, it is quite difficult for wind tunnel test to correctly estimate the constant coefficients in the equation. The transient response of flow pattern at sudden opening is simulated by Computational Fluid Dynamics method. Both the Helmholtz frequency and equivalent viscous losses are obtained. The gain function obtained by using these parameters coincides with the result of wind tunnel test fairly accurately. It is shown that the numerical computation can simulate the flow pattern at sudden opening correctly. Finally the flow dynamical narameters are derived bv fitting the differential eauation to the numerical response.

关 键 词：风洞试验 风致内压 数值模拟 突然开孔 动力特征参数 

分 类 号：TU311.3[建筑科学—结构工程]