Comparison study of URANS and hybrid RANS-LES models on predicting vertical axis wind turbine performance at low, medium and high tip speed ratio ranges

Comparison study of unsteady Reynolds-averaged Navier-Stokes (URANS) and hybrid RANS-LES models is carried out for predicting the performance three-straight-bladed vertical axis wind turbine operating within tip speed ratios (TSRs) ranges (1.44–3.3). The evaluation focused on power coefficient, moment coefficient vortex structure generation, growth transportation predictions. It was found that URANS turbulence modelling sufficient averaged prediction specific range TSR evaluation, it also benefits from short simulation run time. To further evaluate flow field details to understand underlying physics such as dynamic stall behaviour, necessary. Comparing between adopted, stress-blended eddy based transition shear-stress transport (TSST) model has achieved an overall better performance, a reduction discrepancy by 50% in low TSRs compared TSST model. In both medium high ranges, discrepancies are less than 3% at about 25% extra computational Furthermore, range, able predict appearance shedding azimuthal angles (? ? 180°) which failed capture.