Numerical simulation of a swept backward-facing step flow
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摘要: 介绍了开源计算流体力学软件OpenFOAM(Open Field Operation and Manipulation)及面向对象编程技术,并利用其对三维斜掠后台阶流动进行了数值模拟.通过对无斜掠角度情况下用OpenFOAM计算得到的流场速度型和展向涡强度场分布与实验数据的对比研究,证明其具有良好的计算精度和可靠性.通过对不同斜掠角度台阶下游流线与压力分布的详细研究发现随着斜掠角度从0°增加到60°,回流区涡团结构和再附距离均发生了显著变化.其总体趋势是再附距离在30°后会急剧缩小,旋涡强度也会减弱.Abstract: 3-dimensional separated and reattaching flow over a swept backwark-facing step of height h at Re=28000 with turbulent upstream conditions was studied for sweep angles up to Λ = 60° using open field operation and manipulation (OpenFOAM). This new open source software was validated by comparison with experimental data, special attention is focus on the 0° condition. Velocity profile, vortex structure, and pressure distribution were released. The results show that the reattachment length and vortex structure vary with the swept angles from Λ =0° to 60°. Generally the reattachment length and spanwise vorticity decrease dramatically after Λ =30°. Object-orientation techniques and the open source computational fluid dynamics(CFD) package named OpenFOAM are also introduced.
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