Two-dimensional Navier-Stokes equations with a large-scale instability of the Kuramoto-Sivashinsky type. Numerical exploration on the Connection Machine

• Tipo: Artigo em Revista Científica Internacional
• Data: 1991

Autores

Gama, S (Autor) FEUP; Frisch, U (Autor) Outra; Scholl, H (Autor) Outra

Revista

Título: Journal of Scientific Computing

Vol. 6

Páginas: 425-452

ISSN: 0885-7474

Editora: Springer Nature

Indexação

ISI Web of Knowledge

Scopus - 10 Citações

Outras Informações

ID Authenticus: P-007-5GP

DOI: 10.1007/bf01060033

Abstract (EN): The two-dimensional Navier-Stokes equations with a large-scale instability of the Kuramoto-Sivashinsky type, describing marginally negative eddy-viscosity situations, is simulated on a Connection Machine CM-2. Up to millions of time steps at the resolution 256 and tens of thousands at the resolution 1024 are performed. Advantage is taken of a novel complex variable form of the two-dimensional Navier-Stokes equations, which requires only two complex FFTs per time step. A linear growth phase, a disorganized inverse cascade phase, and a structured vortical phase are successively observed. In the vortical phase monopolar and multipolar structures are proliferating and display strongly depleted nonlinearities.

Idioma: Inglês

Tipo (Avaliação Docente): Científica