Low-dimensional dynamics and control of turbulent bluff body wakes

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• Dr Georgios Rigas, CUED
• Friday 08 May 2015, 13:00-14:00
• LR3B, Inglis Building, CUED..

If you have a question about this talk, please contact Aleksandra Przydrozna.

Turbulent flows behind bluff bodies are ubiquitous in engineering applications, with road vehicles being an example of significant environmental and economic relevance. Therefore a mathematically tractable description of them is desirable for their prediction and control. This talk will give insight into the global dynamics and symmetries of turbulent three-dimensional wakes generated by axisymmetric bluff-bodies and their low-order description at high Reynolds numbers. Analysis is based on experimental results from a wind-tunnel mounted axisymmetric bluff body at a diameter-based Reynolds number of ~200,000 – well into the turbulent regime. The modelling is also extended in the presence of external forcing, provided by a Zero-Net-Mass-Flux actuator (synthetic jet) located on the rear base of the bluff body. Finally, we will show how these models can be obtained 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.

This talk is part of the Fluids Group Seminar (CUED) series.

This talk is included in these lists:

• Acoustics Lab Seminars
• Engineering Department Acoustics/Combustion Student seminars
• Fluids Group Seminar (CUED)
• LR3B, Inglis Building, CUED.

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