Implementation of advanced turbulence models in aerodynamic performance prediction of the S818-NR airfoil

This research presents a detailed numerical investigation of subsonic airflow around the S818-NR airfoil at angles of attack from 0° to 20°. Using the finite element method in COMSOL Multiphysics, the aerodynamic performance was evaluated, with particular focus on the SST k-ꞷ turbulence model, which provided superior accuracy in capturing both near-wall separation and free-stream characteristics. Key parameters, including pressure distributions, velocity components, and lift-to-drag ratios, were analysed across a range of Reynolds numbers (5*104 to 106). The computational model was rigorously validated against NASA experimental data, demonstrating high reliability in predicting aerodynamic coefficients. The findings underscore the importance of precise mesh density and solver configurations when simulating modified airfoils such as the S818-NR. These results provide a robust framework for optimising wind turbine blades in low-wind environments, offering a verified numerical approach for developing high-efficiency aerodynamic structures

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