Spectral modeling of rotating turbulent flows

Autores
Baerenzung, J.; <div class="autor_fcen" id="5788">Mininni, P.D.</div>; Pouquet, A.; Politano, H.; Ponty, Y.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
Versión publicada
Descripción
A subgrid-scale spectral model of rotating turbulent flows is tested against direct numerical simulations (DNSs). The case of Taylor-Green forcing is considered, a configuration that mimics the flow between two counter-rotating disks as often used in the laboratory. Computations are performed for moderate rotation down to Rossby numbers of 0.03, as can be encountered in the Earth's atmosphere. We provide several measures of the degree of anisotropy of the small scales and conclude that an isotropic model may suffice at moderate Rossby number. The model, developed previously [J. Baerenzung, H. Politano, Y. Ponty, and A. Pouquet, "Spectral modeling of turbulent flows and the role of helicity," Phys. Rev. E77, 046303 (2008)], incorporates eddy viscosity and eddy noise that depend dynamically on the index of the energy spectrum. We show that the model reproduces satisfactorily all large-scale properties of the DNS up to Reynolds numbers of ~104 and for long times after the onset of the inverse cascade of energy; it is also shown to behave better than either the Chollet-Lesieur eddy viscosity model [J. P. Chollet and M. Lesieur, "Parametrization of small scales of three-dimensional isotropic turbulence utilizing spectral closures," J. Atmos. Sci.38, 2747 (1981)] or an under-resolved DNS. © 2010 American Institute of Physics.
Fil:Mininni, P.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente
Phys. Fluids 2010;22(2):1-13
Materia
Counter rotating
Degree of anisotropy
Eddy viscosity
Eddy viscosity model
Energy spectra
Helicities
Isotropic models
Isotropic turbulence
Parametrizations
Rossby numbers
Scale properties
Small scale
Spectral modeling
Spectral models
Subgrid scale
Under-resolved DNS
Earth atmosphere
Internet protocols
Reynolds number
Rotation
Spectroscopy
Three dimensional
Turbulent flow
Viscosity
Rotating disks
Nivel de accesibilidad
Acceso abierto
Licencia
http://creativecommons.org/licenses/by/2.5/ar
Repositorio
Biblioteca Digital (UBA-FCEN)
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identificador
snrd:HASH01a6bd12da112bd24ef18b60