Computational modelling of two-phase flow around a savonius type wave energy converter in a two- dimensional numerical wave tank
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/333039
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
In the present study, the main objective is to develop a finite volume method
(FVM) based numerical modelling approach incorporated with a Volume of fluid (VOF)
method to investigate the effect of wave on the performance of Savonius rotor in a
two- dimensional numerical wave tank (NWT). A Savonius rotor, whose rotational axis is normal to
the direction of wave generation, is introduced to computationally investigate flow around the
rotor structure at selected wave height conditions. The geometry of the blades is such that wave
motion produces a positive force on the rotor and is constructed using CAD software. Followed by
importing the orthogonal mesh domain constructed in FLOW-3D software environment, defined
in Cartesian coordinates, into the finite volume environment of FLOW- 3D for fluid flow analysis. A
body-fixed reference system (“body system”), introduced for the rotor, and the space reference
system (“space system”) is employed to scrutinize a two- dimensional unsteady turbulent
flow around the rotor structure. At each time step equations of motion are solved for the
rotor under coupled motion with consideration of hydraulic, gravitational and control
forces. The flow simulations are then performed using Reynolds- averaged Navier-Stokes
(RANS) based two-equation RNG k- turbulence model with dynamically computed
turbulent length scale, under the assumption of incompressible, viscous, and transient
two-phase turbulent flow conditions.
From the numerical results obtained and validated against the theoretical data obtained
from the no-rotor flow condition, it can be concluded that the flow characteristics is strongly
dependent upon differing wave propagation conditions and energy conversion rate can be
increased with a proper combination of selected wave height and frequency for
the investigated parametric value range. Flow visualization, which is represented by qualitative
contours of velocity vector field also show different flow patterns at different wave
height
conditions.
CitacióTutar, M.; Erdem, C. Computational modelling of two-phase flow around a savonius type wave energy converter in a two- dimensional numerical wave tank. A: MARINE V. "MARINE V : proceedings of the V International Conference on Computational Methods in Marine Engineering". CIMNE, 2013, p. 622-633. ISBN 978-84-941407-4-7.
ISBN978-84-941407-4-7
Fitxers | Descripció | Mida | Format | Visualitza |
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Marine-2013_53-COMPUTATIONAL MODELLING OF TWO.pdf | 847,7Kb | Visualitza/Obre |