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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.

For access to the full publication, please contact CanmetENERGY Ottawa’s Business Office.

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