Contributo in atti di convegno, 2020, ENG

Hybrid viscous/inviscid modelling of a hydrokinetic turbine performance

M. Gregori, D. Calcagni, F. Salvatore, F. Di Felice, F. Alves Pereira, R. Camussi

Università Romatre, CNR-INM, CNR-INM, CNR-INM, CNR-INM, Università Romatre

A computational study of hydrokinetic turbine hydrodynamics by using a hybrid viscous/inviscid-flow model is presented. The methodology integrates Detached Eddy Simulation for the numerical solution of the Navier-Stokes equations with a Boundary Integral Equation Model for potential flows. The formulation generalizes standard actuator disc models and provides a computationally efficient model to analyse the hydrodynamic performance and flowfield of single turbines and arrays in a viscous turbulent onset flow. An application of the hybrid DES/BIEM model to the analysis of the wake field downstream a horizontalaxis turine in uniform flow is presented. Numerical results for a five-bladed bi-directional turbine with elliptical blade sections are compared with experimental results including performance curves and a detailed characterization of the flowfield downstream the rotor using Particle Image Velocimetry. Results demonstrate the capability of the proposed methodology to correctly describe main flow features characterizing the turbine wake.

4th International Conference on Renewable Energies Offshore (RENEW 2020), Lisbon, Portugal, 12 - 15 October 2020

Keywords

marine renewable energy, tidal turbines, RANSE, boundary element methods

CNR authors

Di Felice Fabio, Salvatore Francesco, Alves Pereira Francisco, Calcagni Danilo

CNR institutes