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    Item type:Publication, Access status: without files ,
    Torsional galloping with magnetic repulsion vertical axis current turbine
    (Elsevier, 2026-10-21)
    Padilha de Lima, João Victor
    ;
    Fernandes, Antonio Carlos
    ;
    Abdel-Maksoud, Moustafa
    The article proposes an innovative concept of a current turbine based on the torsional galloping phenomenon, combined with the magnetic repulsion of a streamlined thin vertical plate, intended to harvest energy from low-head water currents. The driving proposal is to exploit the inherent instability of the arrangement. Hence, a careful non-linear instability analysis using the Poincaré method was performed numerically and experimentally. The mathematical model based on Bessel functions and potential theory was validated experimentally. The study carried out different configurations, comprising different stability conditions. The variances are selected by variance analysis. Since energy extraction is performed due to its unstable behavior, the occurrence of a stable condition must be avoided. It has been possible to select the condition where the turbine presents the most significant instability and the one that will provide higher efficiency. A final experimental set-up reached conclusive and successful feasibility.
    Publicationtype: Journal Article
      156
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    Item type:Publication, Access status: with files ,
    Magnetic based current turbine
    (Norwegian University of Science and Technology, Department of Marine Technology, 2024-04-04)
    Padilha de Lima, João Victor
    ;
    Fernandes, Antonio Carlos
    ;
    Abdel-Maksoud, Moustafa
    This paper presents the concept of an innovative current turbine based on magnetic restoration and optimizes its design. The evaluation of the turbine’s geometries and power take-off mechanism is carried out based on the numerical solution of a non-linear mathematical model already experimentally validated for the proposed system and considers a realistic operational condition. The parameter to be optimized is the turbine operating efficiency. The parameters are optimized within smaller ranges to reach a local optimum within the design space. The reduction of parameter ranges is based on the results of the best turbine configurations.
    Publicationtype: Conference Paper
      31  78