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  4. Modelling the receptivity and development of boundary layer disturbances to surface imperfections

Nov

04

Friday

Modelling the receptivity and development of boundary layer disturbances to surface imperfections

3.00pm

Seminars

Staff, Students, Academics

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

Abstract:

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.

Short Bio:

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 & where

3.00pmFriday 4th November 2016

ELG14 City, University of London Northampton Square London EC1V 0HB United Kingdom