Details of Grant 

EPSRC Reference:	GR/R23657/01
Title:	The Practical Computation of Three-Dimensional Time-Dependent Turbulent Flows In Rotating Cavities
Principal Investigator:	Iacovides, Professor H
Other Investigators:	Launder, Professor B
Researcher Co-Investigators:
Project Partners:	Institut DE Recherches SUR LA
Department:	Mechanical Aerospace and Civil Eng
Organisation:	University of Manchester, The
Scheme:	Standard Research (Pre-FEC)
Starts:	25 February 2002	Ends:	24 August 2006	Value (£):	135,917
EPSRC Research Topic Classifications:	Aerodynamics
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:
Panel History:
Summary on Grant Application Form
The research will consider the three-dimensional, time-dependent simulation of the Reynolds equations for flow within the space between two coaxial discs a short distance apart, one or both of which may be rotating. An existing in-house code, with linear and non-linear eddy-viscosity models of turbulence and also a second-moment closure will be used. A key feature to the success of this project is the introduction of an economical new approach for handling the viscous sub-layer, which returns flow computations that so far have only been possible with low-Reynolds-number models, burat a fraction of the computational cost. Computations will first be performed for totor-stator cavities and rotatingcavities with outer shroud at slow rotational speed, for which a collaborating group at the university of Marseille will be producing DNS data. Preliminary flow visualisation tests at UMIST will guide both groups in the selection of operating conditions. Once the numerical solver has been shown to be able to reproduce the unsteady and non-axisymmetric character of these flows then computations will be extended to other cases and to operating conditions more relevant to gas-turbine cooling applications, aiming to establish the extend to which large-scale instabilities influence the flow and thermal development. Initially a linear effective-viscosity model will be used, and subsequently a non-linear effective-viscosity model and a stress transport model will also be tested. Unsteady axi-symmetric flow computations will also be carried out to establish whether axisymmetric instabilities are important. If time allows, computations explorations in flow management will be undertaken, to discover what simple and inexpensive changes to the cavity configuration could be used either to eliminate the organised structures or to promote their appearance.
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Organisation Website:	http://www.man.ac.uk