Study on the interaction of two cross-flow hydrokinetic turbines in a stream-wise tandem configuration
Laval University in collaboration with Mavi Innovations Inc., Lambda2 Engineering Simulations and Natural Resources Canada (NRCan), has developed a computationally inexpensive simplified turbine array model with the goal of simulating turbine-turbine interactions. This current report aims to evaluate the effectiveness of the simplified model in non-ideal conditions. As the model was developed with clean upstream flow conditions, validation for scenarios with disturbed flow is required. A configuration of two turbines placed in series and spaced six (6) turbine diameters apart in the stream wise direction was used to replicate this non-ideal flow condition.
The project team conducted multiple numerical simulations, the first of which included a tandem turbine configuration, with the simplified model applied for both the upstream and downstream turbines. The project team then completed a hybrid simulation, where the simplified model was applied for the upstream turbine and a high-fidelity full-rotor simulation for the downstream turbine. Lastly, a full (high fidelity) tandem simulation accounting for the geometry of the upstream and downstream rotors was completed.
Results demonstrated that the simplified model is capable of representing turbines in a multi-row turbine array configuration, and therefore can be applied to multi-turbine array optimization studies. The project team concluded that the model is an effective alternative to full rotor simulations, noted to be computationally demanding.
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