Key Note Speakers 

  • Prof. Spencer Sherwin - Imperial College London

Title: Challenges in high Reynolds number spectral h/p flow simulations

Abstract

In this presentation we will outline and investigate the challenges of performing high Reynolds number simulations using spectral h/p element discretisations. The spectral h/p element methods combines the good phase and dispersion properties of spectral methods with the geometric flexibility of finite element methods and can be considered as a high order finite element technique. Whilst these properties are attractive from a numerical discretisation a number of challenges exist in apply these methods to high Reynolds number complex geometry problems.

In this presentation we will first outline the challenges of generating appropriate meshes where body conforming near wall prismatic elements are used to capture the boundary layer dynamics. We will then highlight the role of polynomial de-aliasing and spectral vanishing viscosity to stabilise high Reynolds number transient flows.

 

  • Prof. Peter Schmid - LadHyX - CNRS - Ecole Polytechnique
Title: Adjoint techniques for sensitivity analysis and passive control

Abstract

We will introduce and motivate the analysis of shear flows using direct and adjoint information from the linearized stability operator. This information lays the groundwork for the analysis of complex flows and the design of passive and active control schemes. Linearized direct and adjoint flow fields can be readily obtained directly from numerical simulations via a matrix extraction technique. These fields then provide details about the origin of instabilities and the flow sensitivity to base flow manipulations, among many other possibilities.

Examples from flow around blunt bodies and sound radiation from flow around airfoils will be presented to illustrate the concepts.