| Revue: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000335804 |
| ISSN: | 0103-9733 |
| Autores: | Kadoch, Benjamin1 Domingues, Margarete Oliveira2 Broemstrup, Ingmar3 Larcheveque, Lionel1 Schneider, Kai1 Farge, Marie4 |
| Instituciones: | 1Universite d'Aix-Marseille, Marseille, Bouches-du-Rhone. Francia 2Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo. Brasil 3University of Maryland, College Park, Maryland. Estados Unidos de América 4Ecole Normale Superieure, París. Francia |
| Año: | 2009 |
| Periodo: | Sep |
| Volumen: | 39 |
| Número: | 3 |
| Paginación: | 531-538 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | The coherent vorticity extraction method (CVE) is based on the nonlinear filtering of the vorticity field projected onto an orthonormal wavelet basis made of compactly supported functions. CVE decomposes each turbulent flow realization into two orthogonal components: a coherent and an incoherent random flow. They both contribute to all scales in the inertial range, but exhibit different statistical behavior. We apply CVE to 2563 subcubes extracted from 3D homogeneous isotropic turbulent flows at different Taylor microscale Reynolds numbers (Rλ= 140,240 and 680), computed by a direct numerical simulation (DNS) at different resolutions (N = 2563,5123 and 20483), respectively. We compare the total, coherent and incoherent vorticity fields obtained by using CVE and show that few wavelets coefficients are sufficient to represent the coherent vortices of the flows. Geometrical statistics in term of helicity are also analyzed and the λ2 criterion is applied to the filtered flow fields |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Dinámica de fluidos, Ondulas, Turbulencia isotrópica, Estructuras coherentes, Simulación numérica, Flujos turbulentos |
| Keyword: | Physics and astronomy, Fluid dynamics, Wavelets, Isotropic turbulence, Coherent structures, Numerical simulation, Turbulent flows |
| Texte intégral: | Texto completo (Ver HTML) |
