Details of Grant 

EPSRC Reference:	GR/T26832/01
Title:	Active Shielding - An Innovation Based on the Differential Potential Method with Application to Aeroacoustics
Principal Investigator:	Turan, Professor A
Other Investigators:	Laurence, Professor D
Researcher Co-Investigators:	Dr S Utyuzhnikov
Project Partners:	Fluent Europe Ltd
Department:	Mechanical Aerospace and Civil Eng
Organisation:	University of Manchester, The
Scheme:	Standard Research (Pre-FEC)
Starts:	01 April 2005	Ends:	31 July 2008	Value (£):	216,374
EPSRC Research Topic Classifications:	Acoustics
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:	GR/T26825/01
Panel History:
Summary on Grant Application Form
Computational methods are powerful techniques in many areas of acoustics, and are major tools of research in aeroacoustics. Many of the problems to be solved are complex boundary value problems. A popular method for solving this class of problems in general acoustics is the boundary element method (BEM). Unfortunately the BEM requires the knowledge of a fundamental solution, i.e. the Green's function, which is not always obtainable in cases involving flow, such as in atmospheric acoustics and aeroacoustics. This application proposes a development of the Difference Potential Method (DPM) as a new approach for solving complex engineering acoustics problems. The DPM solves the boundary value problem by replacing the complex boundary by a simple boundary while at the same time maintains the exact solution for the complex boundary. This represents a universal approach that does not require a prior knowledge of a Green's function. It also leads directly to the concept of active shielding, in that the boundary sampling presents the opportunity for active control over the boundary. The advantage of active shielding is that it allows volumetric cancellation of noise as well as automatically distinguishes between wanted and unwanted sound. The concept of DPM and active shielding has only been studied mathematically in the past and this project aims to develop it into a viable computational method. The nature of DPM also lends itself to obvious applications in aeroacoustics as a means of providing realistic boundary conditions to the acoustic propagation from regions of turbulent flow. The project will also develop a powerful, compact numerical scheme that has minimal dispersion and dissipation errors to resolve the acoustic field from CFD results. The focus of the project is on the fundamental development of the techniques. Simple experiments will be used to verify and to demonstrate the viability of methods. More complex applications will be the subject of future proposals.
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Organisation Website:	http://www.man.ac.uk