High fidelity CFD simulation of horizontal axis wind turbines
Niccolo' Nudda
High fidelity CFD simulation of horizontal axis wind turbines.
Rel. Pietro Asinari. Politecnico di Torino, Master of science program in Mechanical Engineering, 2019
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Abstract
The aim of the thesis is to carry out high fidelity computational fluid dynamics, CFD, simulations on the DTU 10MW wind turbine in order to understand (1) what is the best way for generating grids, (2) what is the optimum turbulence model to mimic the aerodynamics behind the turbine and (3) what are the effects of the cell size extruded from the blade, thus on the use of wall functions, on the performance computation. The first part of the thesis deals with several studies done on the NACA 0012 airfoil profile. The latter were done with the aim of familiarizing with the solver Open- Foam and with the grid generator Pointwise and of shallowly forecast, from the airfoil, what the behaviour of the turbine simulations would be by using similar settings.
From the latter we chose to use SIMPLE-Consistent algorithm (since it is faster and more robust than SIMPLE), to study only two turbulence models on the turbine (Spalart-Allmaras and k-omega-SST are the most accurate), to use upwind divergence scheme for turbulence variables and second order upwind for the velocity and to employ wall functions since results were not so different from the ones evaluated with a fine mesh and a direct solution
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