Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Application of the IMERSPEC methodology for simulation of two-dimensional flows over vertical axis turbines
Submission Author:
Lucas Monteiro , GO
Co-Authors:
Lucas Monteiro, Felipe Pamplona Mariano
Presenter: Lucas Monteiro
doi://10.26678/ABCM.COBEM2023.COB2023-2260
Abstract
The aerodynamic behavior in vertical axis turbines is the result of the interaction of a flow over the surfaces of its blades. The objective of this work is to analyze a two- dimensional flow over the blades of a vertical axis turbine, under the influence of low Reynolds numbers, Re ≤ 1000, using the methodology IMERSPEC. It is a methodology resulting from the coupling of the Fourier Pseudo-Spectral Method and the Immersed Boundary Method. For this, initially, it is proposed the simulation of a flow over an airfoil NACA 0012 for Reynolds number equal to 1000. The influence of the variation of the angle of attack of the airfoil was analyzed and the average coefficients of lift and drag were obtained. It is proposed the modeling of a two-dimensional flow over a vertical axis turbine composed of one and three blades constituted by the NACA 0015 airfoil, under a laminar regime, with a Reynolds number equal to 100. The tangential force and normal force coefficients are obtained as a function of the azimuthal position of the blades. The results showed good convergence in relation to those presented in the literature. Through the vorticity fields, it is possible to observe the influence of the rotating movement, which implies the formation of a complex wake formed by swirling structures with different characteristic sizes. In general, under low Reynolds numbers, the applicability of the IMERSPEC methodology proved to be convergent and with good accuracy for modeling flows over turbines, in relation to other numerical methodologies.
Keywords
Vertical axis turbines, airfoil, Fourier Pseudo-Spectral methodology, Immersed Boundary Method
