Large-eddy simulation of turbulent flow past tri-frame configurations of hydrokinetic turbines in an open channel

ORAL

Abstract

An effective way to develop arrays of hydrokinetic turbines in streams and tidal sites is to arrange them in tri-frame configurations, where three turbines are mounted together at the apexes of a triangular frame. Turbines mounted on a tri-frame can serve as the building block for rapidly deploying multi-turbine arrays. We employ large-eddy simulation (LES) to understand wake interactions of turbines mounted on tri-frame configurations and develop design guidelines for field deployment. We employ the computational framework of Yang et.al. (2013) to simulate the flow past turbines with the turbines modeled as actuator lines. The computed results are compared with experiments conducted at the Saint Anthony Falls Lab (SAFL) in terms of mean flow and turbulence characteristics. The flow fields are analyzed to elucidate the mechanisms of turbine interactions and wake evolution in tri-frame configurations and to develop design guidelines for maximizing the combined power output while reducing structural loads due to turbulent fluctuations.

*This work was supported by NSF grant IIP-1318201. The simulations were carried out at the Minnesota Supercomputing Institute.

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Authors

  • Saurabh Chawdhary

    • St. Anthony Falls Laboratory, Department of Mechanical Engineering, University of Minnesota

  • Xiaolei Yang

    • Univ of Minn - Minneapolis
    • St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota

  • Craig Hill

    • CEGE, SAFL University of Minnesota - Minneapolis
    • University of Minnesota
    • St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota

  • Michele Guala

    • CEGE, SAFL University of Minnesota - Minneapolis
    • Univ of Minn - Minneapolis
    • St. Anthony Falls Lab, University of Minnesota
    • University of Minnesota
    • St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota

  • Fotis Sotiropoulos

    • CEGE, SAFL University of Minnesota - Minneapolis
    • University of Minnesota
    • Univ of Minn - Minneapolis
    • St. Anthony Falls Lab, University of Minnesota
    • St. Anthony Falls Laboratory, Department of Civil Engineering, 2 Third Avenue SE, Minneapolis, MN 55414, USA
    • St. Anthony Falls Laboratory, Department of Civil Engineering, University of Minnesota