Turbulent secondary motions over walls with spanwise inhomogeneity

如果紊流暴露在展向具有非均匀边界条件的壁面上，则可能形成大尺度的旋涡结构。这些结构影响壁面附近的传热和传质，因此对于各种不同的自然和技术流动非常重要。在这个项目中，这些二次运动的发展和被动标量的运输的相关影响进行了研究的基础上，不同的边界条件的数值实验。根据所获得的知识，将有可能开发出改进的预测模型，用于二次运动的出现，并产生有针对性地操纵流体流动的想法。

If turbulent flow is exposed to a wall with inhomogeneous boundary conditions in the spanwise direction, large scale vortical structures may develop. These structures influence the heat and mass transfer near the wall and are therefore of great importance for a variety of different natural and technological flows. Within this project the development of those secondary motions and the related influence on the transport of a passive scalar is investigated based on numerical experiments with varying boundary conditions. Based on the gained knowledge it will become possible to develop improved predictive models for the appearance of secondary motions and to generate ideas for the targeted manipulation of fluid flows.