| Journal: | Journal of the Brazilian Society of Mechanical Sciences and Engineering |
| Database: | PERIÓDICA |
| System number: | 000312207 |
| ISSN: | 1678-5878 |
| Authors: | Pereira, L.A.A1 Hirata, M.H Silveira Neto, A2 |
| Institutions: | 1Universidade Federal de Itajuba, Departamento de Mecanica, Itajuba, Minas Gerais. Brasil 2Universidade Federal de Uberlandia, Departamento de Engenharia Mecanica, Uberlandia, Minas Gerais. Brasil |
| Year: | 2003 |
| Season: | Abr-Jun |
| Volumen: | 25 |
| Number: | 2 |
| Pages: | 140-146 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | In this paper a method for the simulation of convection and diffusion of the vorticity, generated on a body surface is presented. A purely Lagrangian scheme is used for the vorticity convection, and thereby avoiding mesh associated problems. The body surface is simulated by straight-line panels, with constant-strength vortex distribution. The strength of the discrete vortices is obtained directly without going through any additional calculation. Using a primary diffusion process this vorticity is replaced by Lamb vortices located nearby the body surface. The diffusion process of the vorticity is simulated using the random walk scheme. Turbulence sub-grid scale modelling employs a Second Order Velocity Structure Function model adapted to the Lagrangian scheme. With a cloud of discrete vortices this velocity structure function model is employed to simulate the micro structures of the flow. The flow over a circular cylinder and a NACA 0012 aerofoil are considered to evaluate the integrated aerodynamic loads. Comparisons are made with previous theoretical and experimental studies |
| Disciplines: | Física y astronomía |
| Keyword: | Mecánica, elasticidad y reología, Vórtices, Metodología, Método de los paneles, Turbulencia, Modelos, Nivel sub-malla |
| Keyword: | Physics and astronomy, Mechanics, elasticity and rheology, Vortices, Methodology, Panel methods, Turbulence, Models, Subgrid scale |
| Full text: | Texto completo (Ver HTML) |
