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Wall-Induced Secondary Currents in Turbulent Flows

Lead Research Organisation: UNIVERSITY COLLEGE LONDON
Department Name: Civil Environmental and Geomatic Eng

Abstract

Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
 
Description In a recent paper, Luo et al., 2023, Environmental Fluid Mechanics 23 (4), 829-846, we revealed the instability mechanism of large-scale motion in open channel flows. It is manifested in asymmtric secondary cells which grow and shrink causing the streamwise structure to meander in the streamwise direction.
Another key finding concerns the use of periodic boundary conditions in the channel flows invetsigated within this award. A paper is currently under review and an update on the outcome of the review will be posted in the next reporting period.
Exploitation Route We are now investigating how this instability can be used to reduce the drag of engineered systems such as pipes and/or vehicles (e.g. high-speed trains or ships).
Sectors Energy

Transport
 
Title Simulation of tidal stream turbines using Hydro3D 
Description Hydro3D is an open-source Large-Eddy Simulation based code used for hydraulic engineering applications and has been recently developed to simulate tidal stream turbines. Hydro3D is written in FORTRAN 95 and is parallelised with MPI, both required to be installed prior code compilation. For a more detailed description of Hydro3D, its current development and related publications please visit: http://hydro3dproject.github.io/ Note that the current dataset gathers the input files set to simulate a single horizontal axis tidal stream turbine operating at its maximum performance and with artificial turbulence at the inflow condition. The input files (.cin) used in Hydro3D are: - control.cin - in this file all the flow conditions, numerical schemes and output paramenters are set. - geom.cin - is used to define the properties of any solid body (e.g. tidal turbine) used during the simulation. - mdmap.cin and infodom.cin - these files indicate the division pattern of the computational domain in rectangular blocks together with their assignation to CPUs. 
Type Of Technology Software 
Year Produced 2017 
Impact The code was enhanced by adding free surface algorithms. 
URL https://research-data.cardiff.ac.uk/articles/software/Simulation_of_tidal_stream_turbines_using_Hydr...