Verification Study for CFD Simulations of NTNU Blind Test 1 Wind Turbine
Conference/Journal32nd International Ocean and Polar Engineering Conference (ISOPE), Shanghai, China
Date12 Jun 2023
Computational Fluid Dynamics (CFD) simulations with fully resolved turbine geometries are increasingly popular for wind turbine aerodynamic analysis. However, the results obtained from the CFD simulations are sensitive to many numerical settings, such as grid spacing, time increment, turbulence models, etc., and thus rigorous quantification of the numerical uncertainties is necessary to be able to have confidence in the results.
In the present study, a modern verification procedure is adopted to assess the numerical uncertainties in the CFD simulations. The NTNU Blind Test 1 turbine is analyzed in the CFD simulations by using ReFRESCO. To quantify the spatial and temporal discretization uncertainties, a simulation matrix consisting of four computational grids with different level of resolutions combined with three different time increments is established. In all the computational grids, the turbine geometry is fully resolved including the blades, hub, nacelle, and tower. Moreover, the computational domain for CFD simulations is constructed such that it exactly matches the wind tunnel in the NTNU Blind Test 1 experiment. Unsteady Reynolds Averaged Navier-Stokes (URANS) simulations with the k-ω SST turbulence model are performed. The Moving-Grid-Formulation (MVG) approach with the sliding interface technique is leveraged to handle the rotating wind turbine and stationary tower and nacelle. By using a modern verification procedure, the numerical uncertainties on the thrust coefficient (CT) and power coefficient (CP) are determined for an inlet velocity of 10 m/s at a tip speed ratio (TSR) of 6.
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In the present study, a modern verification procedure is adopted to assess the numerical uncertainties in the CFD simulations. The NTNU Blind Test 1 turbine is analyzed in the CFD simulations by using ReFRESCO. To quantify the spatial and temporal discretization uncertainties, a simulation matrix consisting of four computational grids with different level of resolutions combined with three different time increments is established. In all the computational grids, the turbine geometry is fully resolved including the blades, hub, nacelle, and tower. Moreover, the computational domain for CFD simulations is constructed such that it exactly matches the wind tunnel in the NTNU Blind Test 1 experiment. Unsteady Reynolds Averaged Navier-Stokes (URANS) simulations with the k-ω SST turbulence model are performed. The Moving-Grid-Formulation (MVG) approach with the sliding interface technique is leveraged to handle the rotating wind turbine and stationary tower and nacelle. By using a modern verification procedure, the numerical uncertainties on the thrust coefficient (CT) and power coefficient (CP) are determined for an inlet velocity of 10 m/s at a tip speed ratio (TSR) of 6.
This paper is copyrighted material and cannot be shared. Due to copyright policy MARIN is not allowed to reproduce and distribute papers written for and presented at the OTC (Offshore Technology Conference), ISOPE (International Ocean and Polar Engineering Conference) and SPE (Society of Petroleum Engineers). You can order these papers through www.OnePetro.orr.
For this specific paper follow this link.
Contact
Arjen Koop
Senior Researcher/Teamleader
Tags
offshore windfloating wind turbinecfdcfd/simulation/desk studies