TITLE:
Numerical Simulation of Flow over an Open Cavity with Self-Sustained Oscillation Mode Switching
AUTHORS:
Takashi Yoshida, Takashi Watanabe
KEYWORDS:
Open Cavity Flow, Self-Sustained Oscillations, Incompressible Flow, Numerical Simulation
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.6 No.4,
December
20,
2016
ABSTRACT: Numerical simulations are used to investigate the self-sustained oscillating flows past an open cavity. The two-dimensional incompressible Navier-Stokes equations are solved directly by using the finite difference method for cavities with an upstream laminar boundary layer. A series of simulations are performed for a variety of cavity length-to-depth ratio. The results show the switching among some flow modes including non-oscillation mode, shear layer mode and wake mode. The variation of the Strouhal number is in favorable agreement with available experimental data. The results of flow fields in the cavity reveal the relationship between the cavity shear layer oscillation modes and recirculating vortices in the cavity.