Details of Grant 

EPSRC Reference:	EP/D500702/1
Title:	Visiting Fellowship for the Investigation of Aspects of Vortex Breakdown Onset and Hysteresis
Principal Investigator:	Badcock, Professor K
Other Investigators:	Barakos, Professor G
Researcher Co-Investigators:
Project Partners:
Department:	School of Engineering
Organisation:	University of Liverpool
Scheme:	Standard Research (Pre-FEC)
Starts:	01 January 2006	Ends:	30 April 2007	Value (£):	16,789
EPSRC Research Topic Classifications:	Aerodynamics
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:
Panel History:
Summary on Grant Application Form
Computational Fluid Dynamics is achieving significant success in predicting vortical flows which are relevant to military aircraft. Recent breakthroughs in Detached Eddy Simulation (DES) have been followed up with several convincing applications to aircraft at high incidence. The current proposal is to bring one of the leading researchers worldwide in this field to Glasgow to initiate an investigation of several fundamental aspects of vortical flow prediction which are relevant to high incidence studies of aircraft dynamics. First, a comparison of the prediction of vortex breakdown on a high sweep delta wing using DES will be made with URANS using a nonlinear eddy viscosity model. At the frequencies of interest URANS may be able to predict this phenomena with good realism and evaluation against DES solutions will allow this to be assessed. Secondly, the hysteresis in vortex breakdown location has the potential to influence the flight responses of a UCAV. There appears to have been little investigation of this phenomena using CFD and, URANS and DES will be validated against available datasets for this problem. Finally, preliminary investigations into breakdown onset will be made using methods which compute the behaviour of the eigensystem of the discrete system Jacobian matrix. The ultimate aim of this work is to establish methods which can predict vortex breakdown onset (without the cost of doing a search using full time domain CFD calculations), and the unsteady flow after breakdown using reduced order modelling. All three topics will help to establish a longer term collaboration with Prof Morton on the application of CFD to dynamics studies of aircraft at high incidence
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Organisation Website:	http://www.liv.ac.uk