A computational investigation of unsteady separated flows

✍ Scribed by P. Koutmos; C. Mavridis

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 1021 KB
• Volume: 18
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(97)00009-x

✦ Synopsis

This work describes the computational investigation of unsteady separated flow configurations periodic, quasi-periodic or flapping within the framework of a global approach. A two-dimensional (2D) time-dependent Navier-Stokes procedure was formulated, which encompasses aspects firom both the large-eddy simulation (LES) formalism and the conventional k-e procedures. Within this context, an effort is made to distinguish large-scale active structures both ,on the basis of their character--deterministic or random--as well as on their size while taking into account the percentage contribution of the vortical structure energy in the total fluctuating energy budget. The proposed model was successfully applied to the calculation of such unsteady separated flow configurations as square cylinder wake and backward-facing step recirculating flows under low-and high-Reynolds number conditions.