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Performance analysis of vertical axis wind turbines by varying tip-speed ratio using open source CFD solver

Gokhale, Gaurav,
Published in AIP
Volume: 2358
Issue: 1
Pages: 1 - 11

A vertical-axis wind turbine (VAWT) is a type of wind turbine where the main rotor shaft is set transverse to the wind (but not necessarily vertically) while the main components are located at the base of the turbine. The performance of a Vertical Axis Wind Turbine (VAWT) is closely related to its Tip Speed Ratio (TSR). It is not easy to know beforehand which TSR will result in maximum power extracted from the VAWT. The objective is to model and simulate a 2D H-type VAWT in an open-source OpenFOAM CFD solver. The turbulence model used is k-Omega SST (Shear Stress Transport), and the rotating domain is set up using Arbitrary Mesh Interface (AMI) and dynamicMeshDict in OpenFOAM. Due to the transient nature of the simulation, pimpleFoam solver is used to simulate VAWT. Forces and Moments are reported after certain timesteps to obtain the torque Vs. Time curve for different TSRs. The simulation is carried out for different TSRs, and the graph of Coefficient of Power (Cp) Vs. TSR is plotted. It is found that the Cp first increases with an increase in TSR up to 0.35, and then Cp decreases. Such type of analyses can be used as a low-cost basis to obtain boundary and initial conditions or obtain baseline input parameters for 3D simulation of VAWTs.

About the journal
JournalAIP Conference Proceedings
Open AccessNo