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SUMMARY:Low-dimensional dynamics and control of turbulent bluff body wakes
   - Dr Georgios Rigas\, CUED
DTSTART:20150508T120000Z
DTEND:20150508T130000Z
UID:TALK57784@talks.cam.ac.uk
CONTACT:Aleksandra Przydrozna
DESCRIPTION:Turbulent flows behind bluff bodies are ubiquitous in engineer
 ing applications\, with road vehicles being an example of significant envi
 ronmental and economic relevance. Therefore a mathematically tractable des
 cription of them is desirable for their prediction and control. This talk 
 will give insight into the global dynamics and symmetries of turbulent thr
 ee-dimensional wakes generated by axisymmetric bluff-bodies and their low-
 order description at high Reynolds numbers. Analysis is based on experimen
 tal results from a wind-tunnel mounted axisymmetric bluff body at a diamet
 er-based Reynolds number of ~200\,000 – well into the turbulent regime. 
 The modelling is also extended in the presence of external forcing\, provi
 ded by a Zero-Net-Mass-Flux actuator (synthetic jet) located on the rear b
 ase of the bluff body. Finally\, we will show how these models can be obta
 ined directly from the governing Navier-Stokes equations through a weakly 
 nonlinear analysis\, providing a general framework for the description of 
 systems with broken symmetries and turbulent dynamics.\n\n
LOCATION:LR3B\, Inglis Building\, CUED.
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