Abstract

Savonius Wind turbines are special class of Vertical Axis Wind Turbines (VAWT). These are low cost drag driven turbines and are known to be inefficient.The performance of the new design is extensively studied on OpenFOAM-v1812, a popular open source CFD library. The flow equations coupled with equations of rotation of the turbine are solved on an overset mesh framework. This study also serves as a validation of recently released over-set support in OpenFOAM. The turbulence is incorporated by coupling Reynolds Averaged Navier Stokes (RANS) with Shear Stress Transport (SST) κ-ω eddy viscosity turbulence model. The turbulence parameters are set to produce a flow with Reynolds number, Re=4.8 × 105. To have better confidence in the simulations, this study also presents a comparison of numerical flow over conventional savonius turbine designs with published data. It is observed that a majority of CFD analysis on wind turbine designs are performed for fixed tip speed ratio on a traditional static mesh structure. But, in this CFD study, a wind driven rotation of savonius turbine is simulated on an overset dynamics approach. The results of the study are compared and discussed based on the predicted moment and power coefficients, pressure variatioon the blades, velocity flow field and wake analysis. The study indicated that the bladed design presented here has a potential to increase the power efficiency of a savonius wind turbine by 10% to 28%

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