Turbulent secondary motions over walls with spanwise inhomogeneity

如果湍流暴露在沿展向具有非均匀边界条件的壁面上，则可能形成大尺度的涡旋结构。这些结构影响壁面附近的传热和传质，因此对各种不同的自然和技术流动非常重要。在本项目中，基于变化边界条件的数值实验，研究了这些次级运动的发展及其对被动标量输运的相关影响。基于所获得的知识，将有可能为二次运动的外观开发改进的预测模型，并产生针对流体流动的定向操纵的想法。

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.