Inhomogeneous anisotropic passive scalars

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

Afonso, MM (Autor) Outra; Sbragaglia, M (Autor) Outra

Revista

Título: Journal of Turbulence

Vol. 6

Página Final: N10

ISSN: 1468-5248

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 4 Citações

Outras Informações

ID Authenticus: P-00N-NM2

DOI: 10.1080/14685240500149732

Abstract (EN): We investigate the behaviour of the two-point correlation function in the context of passive scalars for non-homogeneous, non-isotropic forcing ensembles. Exact analytical computations can be carried out in the framework of the Kraichnan model for each anisotropic sector. We will focus our attention on the isotropic sector with isotropic forcing in order to obtain a description of the influence of purely inhomogeneous contributions. It is shown how the homogeneous solution is recovered at separations smaller than an intrinsic typical lengthscale induced by inhomogeneities, and how the different Fourier modes in the centre-of-mass variable recombine themselves to give a 'beating' ( superposition of power laws) described by Bessel functions. The pure power-law behaviour is restored even if the inhomogeneous excitation takes place at very small scales.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13