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  • CFD Analysis of Plunging Flat Plates at Low-Reynolds Number
    Publication . Gonçalves, Sullivan Benjamim Seixas; Silva, André Resende Rodrigues da
    Unsteady aerodynamics include the study of flows that pass an object subjected to oscillations, and therefore, has a strong link with bioinspired flows and flapping airfoils. The central objective of the dissertation is to study the propulsive characteristics of two flat plates at a Reynolds number, Re, of 3.1 × 103 with straight and sharp trailing edges. The reduced frequency, k, is kept between 1.0 and 5.0 with a nondimensional amplitude, k, ranging between 0.125 and 0.500. The problem is solved numerically using Computational Fluid Dynamics (CFD), and results show that different from what is typically observed in airfoils, the mean thrust coefficient, Ct, does not increase monotonically with the reduced frequency, for h = 0.250, having a dip around k = 3.0. The same is not verified for the mean power coefficient, CP , which increases continuously with the reduced frequency for the entire dimensionless amplitude domain studied. Through analysis of pressure contours around the flat plates, a low-pressure zone was detected near the trailing edge, creating a suction effect in that zone. By analyzing the CP and Ct over one period, the recirculation influence was evidenced, displaying a strong effect on the thrust coefficient parameter. However, results also show the influence of another phenomenon. The LEV’s evolution with k was analyzed, via the normalized distance between its center and the surface of the plate, evidencing a behavior similar to the Ct one previously observed. An attempt to relate the phenomena with the Strouhal number, St, was made, identifying a predictable feature of the performance parameters for St ranging between 0 and 1. The trailing-edge shape revealed to influence the propulsive coefficients, being the overall CP values higher and the Ct lower for the flat plate with a straight trailing edge, when compared to the plate with a sharp one.
    2022-03-30Master thesis Open access Show more
  • Em chamas: Um conto de Haruki Murakami, um filme de Lee Chang-Dong
    Publication . Mancelos, João de
    O filme Burning (2018), do realizador sul-coreano Lee Chang-Dong, adapta o conto «Barn Burning», publicado na antologia The Elephant Vanishes (1993), de Haruki Murakami. Neste artigo, examino as estratégias de adaptação seguidas por Chang-Dong, relativamente a quatro categorias narrativas: personagens, enredo, espaço e tempo. Deste modo, desejo contribuir para uma reflexão acerca da dialética entre a linguagem literária e a audiovisual, a proximidade e o contraste entre ambas, os desafios da adaptação e o poder da criatividade.
    2022-03-30Journal article Open access Show more
  • Prólogo: Literatura & Cinema
    Publication . Mancelos, João de
    Prefácio ao volume 10 (2021) da RUAL: Revista da Universidade de Aveiro: Letras, subordinada ao tema Literatura & Cinema, e coordenada por mim. Refiro o tema e listo os subtemas da revista: os desafios da adaptação cinematográfica; as estratégias e os processos usados; as diferenças e as semelhanças entre a linguagem literária e a audiovisual; a dialética entre a fidelidade e a liberdade criativa; a análise comparativa e as diversas tipologias; o estudo de filmes baseados em contos, novelas ou romances e vice-versa. Menciono, brevemente, o conteúdo dos textos apresentados, com particular ênfase para os artigos.
    2022-03-30Journal article Open access Show more