Forcing of unsteady separated flow and convective heat transfer via bulk upstream oscillations

✍ Scribed by A Bouhadji; N Djilali

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 1005 KB
• Volume: 24
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(02)00201-1

✦ Synopsis

Simulations are presented for the unsteady separated-reattaching flow and associated heat transfer over a long rectangular plate subjected to an oscillatory inlet velocity, U ¼ 1 þ A p sin 2pf p t. The two-dimensional simulations are performed at a Reynolds number of 1000 by solving the time-dependent Navier-Stokes and energy equation using a finite volume method. The computations are performed on a 300 Â 100 grid, using centered second-order accurate spatial discretization, and a third-order time-stepping scheme. The effect of forcing is investigated by exploring the response of the flow over a range of frequencies up to the 60th harmonic of the natural vortex shedding frequencies and for velocity perturbation amplitudes up to 20% of the free stream. Forcing of the flow is found to radically alter the dynamics of the flow and results in significantly higher local heat transfer rates.