Numerical investigation of a tidal stream turbine using two methods of the Multiple Reference Frame and the Actuator Disk Momentum
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Numerical investigation of the flow around an axial tidal turbine were investigated. Two different methods to model the flow around the tidal turbine, the multiple reference frame method and the actuator disk momentum method, were used and compared in terms of accuracy and computational efficiency. Discretization errors were performed for Power and Thrust coefficients. Numerical prediction compared favourably to the experimental measurements from physical tests of the tidal turbine in homogenous flow. The Multiple Reference Frame method was used to compute power coefficient and thrust of a tidal turbine at different tip speed ratios, the forces that act on the turbine blades, and the pressure distributions at each blade cross sections. we performed all our simulations at the best efficient point. We found that the maximum stresses on the turbine blade occurred at turbines radius between 0.8 and 0.9Ro, where Ro is the turbine bald radius. The optimum radial and longitudinal distances were studied for installing other turbines to produce opti-mum power output. We conclude that a farm of our presented turbines, which gives the maximum output power for each turbine, can be arranged with the turbines being separated by three times the turbine’s radius.
Abstract
Numerical investigation of the flow around an axial tidal turbine were investigated. Two different methods to model the flow around the tidal turbine, the multiple reference frame method and the actuator disk momentum method, were used and compared in terms of accuracy and computational efficiency. Discretization errors were performed for Power and Thrust coefficients. Numerical prediction compared favourably to the experimental measurements from physical tests of the tidal turbine in homogenous flow. The Multiple Reference Frame method was used to compute power coefficient and thrust of a tidal turbine at different tip speed ratios, the forces that act on the turbine blades, and the pressure distributions at each blade cross sections. we performed all our simulations at the best efficient point. We found that the maximum stresses on the turbine blade occurred at turbines radius between 0.8 and 0.9Ro, where Ro is the turbine bald radius. The optimum radial and longitudinal distances were studied for installing other turbines to produce opti-mum power output. We conclude that a farm of our presented turbines, which gives the maximum output power for each turbine, can be arranged with the turbines being separated by three times the turbine’s radius.
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