Akademik Veri Yönetim Sistemi
5th International Conference on Computational Methods in Marine Engineering, Hamburg, Almanya, 29 - 31 Mayıs 2013, ss.622-633
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-epsilon turbulence model with dynamically computed turbulent length scale, under the assumption of incompressible, viscous, and transient two-phase turbulent flow conditions.