k-kL两方程湍流模型的改进及验证研究  

Improvement and Validation of k-kL Two-equation Turbulence Model

作　　者：李广佳[1] 李喜乐[1] 张强[2] 郝海兵 李典 

机构地区：[1]中国航天空气动力技术研究院第十一总体设计部,北京100074 [2]西北工业大学航空学院,西安710072 [3]中国航空计算技术研究所第七研究室,西安710068

出　　处：《航空工程进展》2016年第2期209-215,共7页Advances in Aeronautical Science and Engineering

摘　　要：提高湍流数值模拟的准确性,从而明确湍流模型对数值模拟结果的影响具有重要的意义,应用K.S.Abdol-Hamid给出的尺度自适应k-kL两方程模型封闭RANS方程,并修改von Karman长度尺度的限制方法,通过平板、翼型、后台阶等流动的模拟,考察k-kL模型在湍流模拟中的准确性,及其反映主要流动特征的能力和网格收敛性,并对影响流动模拟准确性的因素进行讨论。结果表明:改进长度尺度限制之后的k-kL两方程模型无论是对附着流动还是分离流动都可以给出比较准确的结果。It is of important significance to improve the accuracy of turbulent flow simulations,and identify the effects of turbulence model on simulation results.The scale adaptive k-kLtwo-equation turbulence model constructed by K.S.Abdol-Hamid is applied to close RANS equations and assessed.A modification to the upper limit in von Karman length scale is proposed.Some factors effecting simulation accuracy are also discussed.A number of test cases including flat plate case,airfoil case and backward facing step case are run to demonstrate the accuracy of this model and its capability to resolve important flow features and grid convergence.Test results show that this turbulence model is superior or at least comparable to other two-equation turbulence models in simulating either attached or separated turbulent flows.

关 键 词：k-kL两方程湍流模型 RANS von Karman长度尺度 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]