Suscripción a Biblioteca: Guest
Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

PHYSICAL INSIGHT INTO THE UNSTEADY SHOCK-WAVE TURBULENT BOUNDARY LAYER INTERACTION USING LARGE EDDY SIMULATION

pages 1-6
DOI: 10.1615/TSFP7.1430
Get accessGet access

SINOPSIS

Separated flows, characterized by the presence of a recirculation bubble and a shear-layer developping along the bubble, are often the seat of self-sustained low-frequency (LF) dynamics. The case of the shock-wave turbulent boundary layer interaction (SWTBLI) on a flat plate is analysed by means of LES simulations. A recent non-linear modal analysis, based on the 'dynamic mode decomposition' (DMD) is applied to an LES database. The typical LF modes are associated with a cyclic contraction and expansion of the recirculation bubble, taking the form of filling and emptying very close to the description of the mass-budget-based model proposed by Piponniau et al. (2009). The bubble is found to be divided into two zones, an upstream one associated with LF dynamics, and a downstream one associated with high-frequency 'Kelvin- Helmholtz-type' ('KH-type') vortices. When increasing the Strouhal number, the spatial support of the DMD modes moves continuously from the first part of the bubble to the entire bubble and the downstream flow.

Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones Precios y Políticas de Suscripcione Begell House Contáctenos Language English 中文 Русский Português German French Spain