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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2017.tde-30032017-113355
Document
Author
Full name
Tiago da Silva Souza
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Souza, Podalyro Amaral de (President)
Ortiz, Jayme Pinto
Vatavuk, Paulo
Title in Portuguese
Geração de vórtices de Von Kármán com modelagem em CFD.
Keywords in Portuguese
CFD
Número de Reynolds
Número de Strouhal
Vórtices dos fluídos
Abstract in Portuguese
Assim como um peixe pode aproveitar a energia dos vórtices formados por uma rocha em uma corredeira para economizar energia e produzir impulso, este trabalho tem por objetivo mostrar que os vórtices de von Kármán ou esteira de vórtices, desprendidos de um corpo cilíndrico colocado em um escoamento contínuo, com uma placa de um determinado comprimento, posicionada atrás desse corpo cilíndrico e com movimentos livres na horizontal, pode vibrar e produzir movimentos rotacionais, e por fim, uma frequência, com o objetivo de se aproveitar esse movimento para geração de energia. Para tanto, utilizou-se software CFD (Computational Fluid Dynamic), para observar e quantificar os movimentos produzidos pela placa. Observou-se também, entre três comprimentos de placa, com três velocidades diferentes, três números de Reynolds diferentes e com escoamentos laminar e turbulento, como as placas se comportam e qual delas produz movimento com maior frequência. Buscou-se também verificar a eficiência do movimento para números de Strouhal menores e iguais a 0,21.
Title in English
Von Kármán vortex shedding with modelling in CFD.
Keywords in English
CFD
Reynolds number
Strouhal number
Von Kármán
Vortex
Abstract in English
Just as a fish can harness the energy of the vortices formed by a rock in the rapids to save energy and produce impulse this paper aims to show that the von Kármán vortex or wake vortex, detached from a cylindrical body placed in a flow continuous with a plate of a certain length, positioned behind this cylindrical body and freely moving horizontally, may vibrate and produce rotational movements, and finally, a frequency, in order to take advantage of this movement to generate power. Therefore, we used CFD software (Computational Fluid Dynamic), to observe and quantify the movements produced by the board. It was also observed between three plate lengths with three different velocities, three different Reynolds numbers and laminar and turbulent flow as the plates behave and which one produces motion with higher frequency. It sought to verify the efficiency of movement to lower Strouhal numbers and equal to 0.21.
 
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TiagodaSilvaSouza.pdf (3.22 Mbytes)
Publishing Date
2017-03-30
 
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