RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine
Nowadays, the global energy crisis has encouraged the use of alternative sources like the energy available in the water currents of seas and rivers. The vertical axis water turbine (VAWT) is an interesting option to harness this energy due to its advantages of facile installation, maintenance and op...
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doaj-c98dc14d435344baa338356b9192f6b22020-11-24T21:04:42ZengMDPI AGEnergies1996-10732018-09-01119234810.3390/en11092348en11092348RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water TurbineOmar D. Lopez Mejia0Jhon J. Quiñones1Santiago Laín2Department of Mechanical Engineering, Universidad de los Andes, Bogotá 111711, ColombiaDepartment of Mechanical Engineering, Universidad de los Andes, Bogotá 111711, ColombiaPAI+ Group, Department of Energetics and Mechanics, Universidad Autónoma de Occidente, Cali 760030 ColombiaNowadays, the global energy crisis has encouraged the use of alternative sources like the energy available in the water currents of seas and rivers. The vertical axis water turbine (VAWT) is an interesting option to harness this energy due to its advantages of facile installation, maintenance and operation. However, it is known that its efficiency is lower than that of other types of turbines due to the unsteady effects present in its flow physics. This work aims to analyse through Computational Fluid Dynamics (CFD) the turbulent flow dynamics around a small scale VAWT confined in a hydrodynamic tunnel. The simulations were developed using the Unsteady Reynolds Averaged Navier Stokes (URANS), Detached Eddy Simulation (DES) and Delayed Detached Eddy Simulation (DDES) turbulence models, all of them based on k-ω Shear Stress Transport (SST). The results and analysis of the simulations are presented, illustrating the influence of the tip speed ratio. The numerical results of the URANS model show a similar behaviour with respect to the experimental power curve of the turbine using a lower number of elements than those used in the DES and DDES models. Finally, with the help of both the Q-criterion and field contours it is observed that the refinements made in the mesh adaptation process for the DES and DDES models improve the identification of the scales of the vorticity structures and the flow phenomena present on the near and far wake of the turbine.http://www.mdpi.com/1996-1073/11/9/2348Darrieus turbineDelayed Detached Eddy SimulationDetached Eddy Simulationvertical axis water turbineComputational Fluid DynamicsHybrid RANS-LES models |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Omar D. Lopez Mejia Jhon J. Quiñones Santiago Laín |
spellingShingle |
Omar D. Lopez Mejia Jhon J. Quiñones Santiago Laín RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine Energies Darrieus turbine Delayed Detached Eddy Simulation Detached Eddy Simulation vertical axis water turbine Computational Fluid Dynamics Hybrid RANS-LES models |
author_facet |
Omar D. Lopez Mejia Jhon J. Quiñones Santiago Laín |
author_sort |
Omar D. Lopez Mejia |
title |
RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine |
title_short |
RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine |
title_full |
RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine |
title_fullStr |
RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine |
title_full_unstemmed |
RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine |
title_sort |
rans and hybrid rans-les simulations of an h-type darrieus vertical axis water turbine |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2018-09-01 |
description |
Nowadays, the global energy crisis has encouraged the use of alternative sources like the energy available in the water currents of seas and rivers. The vertical axis water turbine (VAWT) is an interesting option to harness this energy due to its advantages of facile installation, maintenance and operation. However, it is known that its efficiency is lower than that of other types of turbines due to the unsteady effects present in its flow physics. This work aims to analyse through Computational Fluid Dynamics (CFD) the turbulent flow dynamics around a small scale VAWT confined in a hydrodynamic tunnel. The simulations were developed using the Unsteady Reynolds Averaged Navier Stokes (URANS), Detached Eddy Simulation (DES) and Delayed Detached Eddy Simulation (DDES) turbulence models, all of them based on k-ω Shear Stress Transport (SST). The results and analysis of the simulations are presented, illustrating the influence of the tip speed ratio. The numerical results of the URANS model show a similar behaviour with respect to the experimental power curve of the turbine using a lower number of elements than those used in the DES and DDES models. Finally, with the help of both the Q-criterion and field contours it is observed that the refinements made in the mesh adaptation process for the DES and DDES models improve the identification of the scales of the vorticity structures and the flow phenomena present on the near and far wake of the turbine. |
topic |
Darrieus turbine Delayed Detached Eddy Simulation Detached Eddy Simulation vertical axis water turbine Computational Fluid Dynamics Hybrid RANS-LES models |
url |
http://www.mdpi.com/1996-1073/11/9/2348 |
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