Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method
| Autor: | Alex Mendonça Bimbato, Marcos André de Oliveira, Crystianne Lilian de Andrade, Luiz Antonio Alcântara Pereira, Paulo Guimarães de Moraes |
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| Přispěvatelé: | Federal University of Itajubá (UNIFEI), Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Control and Optimization
020209 energy Roughness model Energy Engineering and Power Technology 02 engineering and technology 01 natural sciences lcsh:Technology Bluff body 010305 fluids & plasmas Lagrangian description Physics::Fluid Dynamics symbols.namesake Flow separation 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Fluid dynamics Surface roughness Cylinder Electrical and Electronic Engineering bluff body Engineering (miscellaneous) Physics Renewable Energy Sustainability and the Environment lcsh:T suppression hybrid control Reynolds number Mechanics Vortex shedding Venturi effect Suppression hybrid control Vortex roughness model symbols Strouhal number Energy (miscellaneous) |
| Zdroj: | Energies Volume 13 Issue 17 Pages: 4481 Energies, Vol 13, Iss 4481, p 4481 (2020) Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en13174481 |
| Popis: | Made available in DSpace on 2020-12-12T01:38:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-09-01 A discrete vortex method is implemented with a hybrid control technique of vortex shedding to solve the problem of the two-dimensional flow past a slightly rough circular cylinder in the vicinity of a moving wall. In the present approach, the passive control technique is inspired on the fundamental principle of surface roughness, promoting modifications on the cylinder geometry to affect the vortex shedding formation. A relative roughness size of ϵ∗/d∗= 0.001 (ϵ∗is the average roughness and d∗is the outer cylinder diameter) is chosen for the test cases. On the other hand, the active control technique uses a wall plane, which runs at the same speed as the free stream velocity to contribute with external energy affecting the fluid flow. The gap-to-diameter varies in the range from h∗/d∗= 0.05 to 0.80 (h∗is the gap between the moving wall and the cylinder bottom). A detailed account of the time history of pressure distributions, simultaneously investigated with the time evolution of forces, Strouhal number behavior, and boundary layer separation are reported at upper-subcritical Reynolds number flows of Re = 1.0 × 105. The saturation state of the numerical simulations is demonstrated through the analysis of the Strouhal number behavior obtained from temporal history of the aerodynamic loads. The present work provides an improvement in the prediction of Strouhal number than other studies no using roughness model. The aerodynamic characteristics of the cylinder, as well as the control of intermittence and complete interruption of von Kármán-type vortex shedding have been better clarified. Mechanical Engineering Institute Federal University of Itajubá (UNIFEI) School of Engineering São Paulo State University (UNESP) School of Engineering São Paulo State University (UNESP) |
| Databáze: | OpenAIRE |
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