摘要
利用计算流体动力学(CFD)原理在计算机上模拟建筑结构周围风场的变化,可以求解结构表面的风压。计算流体动力学中,无论采用何种湍流模型,给定适当的边界条件都是一个相当重要的问题。湍流边界条件主要涉及两个重要的物理量:湍动能k和湍动能耗散率ε,而二者的表达式中涉及两个系数:k0和L0u。对于不同的大气边界层假设,k0和L0u有不同的取值。但究竟哪组值最准确,目前尚无定论,还有很多地方值得进一步研究。详细探讨了如何确定最合适的系数k0和L0u:针对CAARC标准模型,对k0和L0u取不同的值和不同的组合,经过试算和比较,从中选取最合适的值及其组合。
Computational Fluid Dynamics(CFD) can be used to obtain the wind flow and the wind pressures,through simulating the wind environment around structures with a computer.In computational fluid dynamics,no matter what turbulence model is applied,it's a really important matter to give proper boundary conditions.There are two important parameters in the turbulent boundary condition: turbulent energy of motion k and turbulent energy dissipation rate ε,in those expressions there are two coefficients: k0 and L0u.Based on different atmospheric boundary layers,k0 and L0u have different values.But up to present there is no acceptable answer to which values are most accurate,leaving much room for exploration.This paper investigates how to choose the best values of k0 and L0u in detail: Through computation and comparison based on CAARC standard model,different values are given to k0 and L0u and the best combination can be obtained.
出处
《结构工程师》
2010年第5期98-103,共6页
Structural Engineers
