Denis Sipp (ONERA): Flow Reconstruction using Data-Assimilation and Resolvent Analysis (27/05/2020)
Channel: UKFN SIG Flow instability, modelling and control
Date: 2020-06-19

This is the plenary talk of the 1st online meeting of the UKFN SIG on Flow Instability Modelling and Control. Full details of the event are available at https://fluids.ac.uk/sig/FlowInstability

SPEAKER: Denis Sipp, ONERA

TITLE: Reconstruction of time-averaged and unsteady data in open-flows using non-linear optimization techniques and hydrodynamic stability

ABSTRACT: The accurate reconstruction of time-averaged and unsteady data in wind-tunnels from few measurements has become an important topic in the aerospace industry. We will show here how the use of time-averaged (Reynolds-Averaged Navier-Stokes) and fully unsteady (Navier-Stokes) models may help reconstruct a whole flow field from scarce measurements using non-linear optimization techniques. This will be illustrated on experimental and numerical configurations exhibiting separation, such as bluff-bodies, backward facing step flows or jet flows. Finally, we will show how the knowledge of the time-averaged flow and its hydrodynamic stability properties may provide an alternative efficient way of reconstructing large-scale and low-frequency unsteady features in turbulent flows.