Large eddy simulation of a flow with multiple streamwise curvatures

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2004

Autores

José Silva Lopes (Autor) Outra; U. Piomelli (Autor) Outra; José Laginha Palma (Autor) FEUP

Ata de Conferência Internacional

Título: Direct and Large-Eddy Simulation V, Proceedings

Páginas: 537-544

5th International ERCOFTAC Workshop on Direct and Large-Eddy Simulation

Munich, GERMANY, AUG 27-29, 2003

Indexação

ISI Web of Knowledge - 0 Citações

Outras Informações

ID Authenticus: P-000-CK3

Abstract (EN): The flow in an S-duct at Re-b = 2U(b)h(in)/v = 13, 800 was modeled by large-eddy simulation, using a Lagrangian-dynamic eddy-viscosity subgrid-scale model and a non-orthogonal grid system. The stabilizing and destabilizing effects due to convex and concave curvature were predicted by the numerical method. The major changes in the turbulence occurred in the regions of curvature change, where the boundary layers were subjected to pressure gradients. The instantaneous streamwise velocity fluctuations showed a regular, well-organized pattern of low- and high-speed streaks, probably due to the Taylor-Gortler vortices commonly seen in boundary layers near concave surfaces. An unsteady separation region, with multiple recirculation bubbles, was observed in the transition region between the convex and concave regions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8