基于CFD技术的脊状表面湍流流场特性研究

在湍流状态下,利用计算流体力学(CFD)技术,对一系列布置不同尺寸顺流向脊状结构的表面进行了数值模拟。模拟过程采用Reynolds应力方程湍流模型,并且编制程序设定了充分发展的湍流入口边界。通过与光滑表面比较发现,脊状结构附近产生的流向涡是脊状表面减阻或者增阻的重要原因。流向涡改变了近壁面流场结构,引起了边界层近壁区雷诺应力和壁面剪应力的变化,脊状表面也因此出现了减阻或者增阻的现象。

Turbulent flow field characteristic research about riblet surface based on CFD technique

Numerical simulation about surface with a series of different size streamwise riblet structure has been carried out in turbulent flow by Computational Fluid Dynamics(CFD) technique.Reynolds stress equation model is adopted in the simulation process and full developed turbulent inlet boundary is set by program.Results are obtained from comparison between smooth and riblet surface.The streamwise vortex near riblet structure is an important reason of drag-reduction or drag-increase about riblet surface.The str...