用二维N-S方程计算汽车流场的地面效应(英文)  

The Calculation of Ground Effect on a Car Flow Field Using Two Dimensional Navier-Stokes Equations

作　　者：朱国林[1] M.Kronast 

机构地区：[1]中国空气动力研究与发展中心 [2]德国鲁尔大学热-流体动力研究所

出　　处：《空气动力学学报》1993年第1期22-32,共11页Acta Aerodynamica Sinica

摘　　要：采用有限体积方法求解了Navier-Stokes方程,计算了绕二维类汽车物体的绕流并研究了地面效应。在非正交网格系统上以强守恒形式构造出有限体积方程,采用压力校正算法来求解所得到的方程。对于湍流情况,采用了双方程模型的κ_ε模型。 为了验证采用本程序计算移动壁面效应的正确性,本文给出了Couette流动的计算结果。 本文也给出了汽车绕流的计算结果,它包括层流情况,从汽车头部开始由层流转为湍流的混合流动情况及湍流情况。对于每一种情况都比较了移动壁面的计算结果和固定壁面的计算结果。Navier-Stokes equations are solved numerically by a finite-volume method and applied to study flow around two-dimensional car like body and to study the ground effects. The finite volume equations are formulated in strong conservative form on a non-orthogonal grid system. The resulting equations are then solved by the pressure-correction algorithm. For turbulent flow case, the k-ε model is used.The calculational results of the Couette flow are presented to demonstrate that using this program can obtain the correct and accurate results considering moving wall effects.This report has also presented the car calculation results that include laminar flew case, mixed flow case in which the flow field transfers from laminar into turbulence,and turbulent flow case. For each flow case,the results of the moving wall are compared with those cf the fixed wall.

关 键 词：N-S方程 流场 地面效应 类汽车物体 

分 类 号：U461.1[机械工程—车辆工程]