Large eddy simulation of a flow with multiple streamwise curvatures

• Type: Article in International Conference Proceedings Book
• Date: 2004

Authors

José Silva Lopes (Author) Other; U. Piomelli (Author) Other; José Laginha Palma (Author) FEUP

Conference proceedings International

Title: Direct and Large-Eddy Simulation V, Proceedings

Pages: 537-544

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

Munich, GERMANY, AUG 27-29, 2003

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ISI Web of Knowledge - 0 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8