A Numerical Study Of Transition Control By Periodic Suction Blowing

Download or read book A Numerical Study of Transition Control by Periodic Suction-Blowing written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The applicability of active control of transition by periodic suction-blowing is investigated via direct numerical simulations of the Navier-Stokes equations. The time-evolution of finite-amplitude disturbances in plane channel flow is compared in detail with and without control. The analysis indicates that, for relatively small three dimensional amplitudes, a two dimensional control effectively reduces disturbance growth rates even for linearly unstable Reynolds numbers. After the flow goes through secondary instability, three dimensional control seems necessary to stabilize the flow. An investigation of the temperature field suggests that passive temperature contamination is operative to reflect the flow dynamics during transition. Biringen, Sedat Unspecified Center NASA-CR-4095, NAS 1.26:4095 NAG1-462; RTOP 505-60-21-01