一种结合壁面模型模拟湍流流动的间断界面浸入边界法  

A sharp-interface immersed boundary method combined with wall model to simulate turbulent flow

作　　者：张仕钊 吴杰[1] 杨德武 丛歆雨 ZHANG Shizhao;WU Jie;YANG Dewu;CONG Xinyu(College of Aerodynamics,College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空学院空气动力学系,南京210016

出　　处：《航空学报》2023年第11期148-160,共13页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(12072158);江苏省自然科学基金(BK20191271)。

摘　　要：提出了一种具有鲁棒性的间断界面浸入边界法,用来模拟不可压湍流的物体绕流问题。开发了一种新的OpenFOAM求解器,该求解器结合了压力隐式分裂算法和k-ωSST湍流模型求解Navier-Stokes方程。为了减少对近壁面网格的要求,在实施边界条件时,采用壁面模型计算得到的壁面剪切力将速度和湍流变量修正联系起来。壁面切应力采用远离壁面的镜像点求得,镜像点上流场变量通过反距离线性插值由周围流场信息得到。使用该求解器模拟了平板绕流、NACA0012表面压强和切应力分布、Buice扩散管、圆柱绕流、方柱绕流5个湍流流动问题,本文数值模拟结果与文献结果有较好的一致性,验证了该方法模拟湍流流动的有效性和准确性。A robust sharp-interface immersed boundary method is proposed to simulate the incompressible turbulence flow over a solid obstacle.Based on the OpenFOAM,the solver combines the implicit split operator algorithm with the k⁃ωShear Stress Transfer turbulence model to solve the velocity⁃pressure coupling in Navier⁃Stokes equations and the turbulent flow near the obstacle surface.The wall model is used to reduce the number of girds near the wall.The wall shear stress is obtained from the mirror point away from the wall,and the flow variables at image points are obtained using the surrounding flow field by Inverse Distance Weight(IDW).To validate the efficiency and accuracy of this method for simulation of incompressible turbulence flow,five turbulent flow cases are considered as follows:flow over a flat plate,flow pass a NACA0012 airfoil,Buice 2D diffuser,flow around a circular cylinder,and flow around a square cylinder.The simulation results show good agreement with literature,validating the efficiency and accuracy of the method proposed.

关 键 词：浸入边界法 壁面模型 间断界面 湍流流动 OPENFOAM 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]