Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Large-eddy simulation of the flow though a propeller hydrokinetic turbine
Submission Author:
Pedro Henrique Dias de Véras Sousa , DF
Co-Authors:
Mario Benjamim Baptista de Siqueira, Pedro Henrique Dias de Véras Sousa
Presenter: Pedro Henrique Dias de Véras Sousa
doi://10.26678/ABCM.COBEM2017.COB17-1844
Abstract
Large-eddy simulations (LES) of a horizontal axis hydrokinetic turbine have been performed to proper understanding of the unsteady behavior of the flow patterns in wake region. Initially, Reynolds Averaged Navier-Stokes (RANS) simulations using k-ε turbulence model were carried out to obtain an initial flow field around the turbine. Then, LES with a dynamic Smagorinsky-Lilly subgrid scale (SGS) model and a uniform inlet velocity condition has been performed to evaluate the unsteady features of the flow. Despite being able to evaluate fluctuating loads on the turbine, results using LES have shown an increased influence of the turbine on the flow downstream. Wake profiles have shown that LES captures more information of the flow and, being less dissipative than RANS, its recovery of velocity deficit is slower. The formation, stretching and dissipation of tip vortices along the wake have been discussed and the structure of the near and far wakes have been analyzed.
Keywords
Large Eddy Simulation, dynamic SGS, hydrokinetic turbines, wake modelling, Turbulence
