Rough-wall turbulent boundary layers under external disturbances

粗糙壁边界层在工程和环境应用中普遍存在。以前的大多数研究都是在具有零压力梯度或自由流中的层流的正则环境中考察粗糙壁上的湍流边界层。然而，在实践中，大多数流动要么具有不利压力梯度的有利条件(如翼型、船体等)，要么具有自由流扰动。这些外部影响对边界层流动的影响尚不清楚。在这个项目中，我们将使用高保真诊断技术(PIV、阻力平衡等)来了解在压力梯度和自由流湍流作用下的粗糙壁面上的流动。这些测量将使用博尔德伍德园区内全新的最先进设施(新的风洞和水槽)。

Rough-wall boundary layers are ubiquitous in engineering and environmental applications. Most previous studies have examined turbulent boundary layers over rough-walls in a canonical setting with either a zero pressure gradient or a laminar flow in the freestream. However, in practice, most flows either have a favourable of adverse pressure gradient (such as airfoils, ship hulls etc) or have freestream disturbances. The effect of these external influences on the boundary layer flow remains unexplored. In this project, we will use high fidelity diagnostics (PIV, drag balance etc) in order to understand the flow over rough-walls that are under pressure gradients and freestream turbulence. Brand-new state-of-the-art facilities in the Boldrewood campus (new wind tunnel and water flume) will be used for these measurements.