Details of Grant 

EPSRC Reference:	GR/M05843/01
Title:	PREDICTING WAKE-PASSING TRANSITION IN TURBOMACHINERY USING AN INTERMITTENCY-CONDITIONED MODELLING APPROACH
Principal Investigator:	Hodson, Professor H
Other Investigators:	Dawes, Professor WN Savill, Professor M
Researcher Co-Investigators:
Project Partners:	Rolls-Royce Plc (UK)
Department:	Engineering
Organisation:	University of Cambridge
Scheme:	Standard Research (Pre-FEC)
Starts:	01 November 1998	Ends:	31 October 2001	Value (£):	173,414
EPSRC Research Topic Classifications:	Aerodynamics
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:
Panel History:
Summary on Grant Application Form
The current proposal attempts to address the key weakness in present Computational Fluid Dynamic methods for turbomachinery flows - their inability to predict transition accurately - which places a severe restriction on their use for design purposes. Recently considerable progress has been made in understanding and modelling by-pass transition due to free-stream turbulence, largely due to collaborative research involving or co-ordinated by the proposers. However advances have thus far been restricted to steady flow applications and work in the USA has made clear the need to develop similar predictive capabilities for unsteady flows. It is therefore proposed to investigate the possibility of extending an intermittency conditionalised model approach to see if this can capture the unsteady transition phenomena observed due to wake-passing in multistage flows. The first, proof-of-concept, step will be to impose a time-varying intermittency on steady 2D computations for a generic LP turbine cascade and other blading test cases. Subsequently the intermittency prescription will be refined to take account of variable pressure gradient effects and then implemented alongside an alternative intermittency transport model approach in a 3D Navier-Stokes code for testing on 2D and 3D steady and unsteady flows; leading to definition of a practical engineering design methodology.
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Organisation Website:	http://www.cam.ac.uk