Speaker: Dr Christian Thomas, Research Associate at Imperial College London
Research Centre: Turbulence and Flow Control Research Group
Title: Modelling the receptivity and development of boundary layer disturbances to surface imperfections
Accurate and robust methods for predicting the laminar-turbulent transition processes on an aircraft wing are essential for determining flight performance characteristics. Modelling the role of distributed surface roughness in generating boundary layer disturbances is critical in establishing manufacturing tolerances. Additionally, the junctions between wing components can potentially enhance the growth of boundary layer disturbances, causing the premature onset of transition. In this presentation we describe several routines for investigating the early stages of transition past realistic wing geometries: receptivity and the linear development of crossflow and TS wave instabilities. An adjoint receptivity method is developed to undertake a Monte-Carlo type analysis of many 1000’s of roughness distributions, which instantaneously predicts the amplitude of the boundary layer disturbances. PSE and LNS formulations are utilised to study the effects of small gap deformations on the evolution of TS wave instabilities. Relationships are then derived relating the dimensions of the gap and the augmentation of the disturbance.
Christian Thomas is a Research Associate at Imperial College London. He joined IC in 2011 after completing his PhD at Cardiff University and a postdoctoral position at the University of Western Australia. His field of interest concerns the laminar-turbulent transition processes in boundary layers. Dr. Thomas currently works with Airbus Group Innovations, collaborating on the development, implementation and application of new boundary layer methods, for investigating the effects of distributed roughness and surface deformations.
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When and where
3.00pmFriday 4th November 2016