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Reference Number EP/G068925/1
Title Turbulence and wall shear stress in unsteady internal flows with rough surfaces
Status Completed
Energy Categories ENERGY EFFICIENCY(Transport) 20%;
FOSSIL FUELS: OIL, GAS and COAL(Oil and Gas, Oil and gas combustion) 10%;
OTHER POWER and STORAGE TECHNOLOGIES(Electric power conversion) 20%;
NOT ENERGY RELATED 50%;
Research Types Basic and strategic applied research 100%
Science and Technology Fields ENGINEERING AND TECHNOLOGY (Mechanical, Aeronautical and Manufacturing Engineering) 100%
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Dr S (Shuisheng ) He
No email address given
Mechanical Engineering
University of Sheffield
Award Type Standard
Funding Source EPSRC
Start Date 01 July 2010
End Date 01 March 2011
Duration 9 months
Total Grant Value £340,417
Industrial Sectors No relevance to Underpinning Sectors
Region Yorkshire & Humberside
Programme NC : Engineering
 
Investigators Principal Investigator Dr S (Shuisheng ) He , Mechanical Engineering, University of Sheffield (99.998%)
  Other Investigator Professor T O'Donoghue , Engineering, University of Aberdeen (0.001%)
Dr D Pokrajac , Engineering, University of Aberdeen (0.001%)
  Industrial Collaborator Project Contact , Brinker Technology Ltd (0.000%)
Web Site
Objectives Linked to grant EP/G069441/1
Abstract Knowledge of the fundamental flow physics for steady flow over rough-walls has progressed steadily through experiments, and more recently through advanced numerical simulations using Large Eddy Simulation (LES) and Direct Numerical Simulation (DNS). Well-founded engineering methods exist for calculating friction. In contrast, the study of unsteady flow and friction over rough walls is very limited and is mostly confined to open channel oscillatory flow, largely motivated by application to sediment transport under sea waves.For internal flows (pipe and duct flow), present understanding of unsteady flow and practical engineering models for predicting unsteady friction are limited primarily to smooth wall conditions and this despite the fact that most internal unsteady flows occur over rough boundaries. There are basic differences between the near-wall structure of flow and turbulence in smooth and rough wall flows which make it highly likely that unsteady flow dynamics over rough walls are significantly different from those over smooth walls, and the extent to which results relating to unsteady flow over smooth walls apply to rough wall conditions is unknown. This knowledge gap handicaps applications ranging from the development of advanced methods of leak detection in pipelines and the prevention of sonic booms from railway tunnels to optimising the control of hydro and nuclear power systems.The aim of the proposed research is to advance understanding of turbulence andwall shear stress in unsteady internal flows over rough surfaces, thereby underpinning the developmentof engineering models through an integrated programme of experimental, numerical and theoretical studies. The numerical simulations using DNS/LES will generate very detailed information on the turbulent flow behaviour, especially in the near-wall region extending below the roughness elements, but only for conditions of low Reynolds number and high relative roughness since computing resourcesrequired increase exponentially beyond these conditions. Complementary experiments will be carried out to produce data covering a greater range of flow conditions, more directly relevant to practical applications. Computational and experimental data will be analysed to quantify turbulence dynamics and wall shear stress in unsteady flows over rough surfaces
Publications (none)
Final Report (none)
Added to Database 02/11/09