Numerical investigation of a jet and vortex actuator in a cross flow boundary layer

Çadırcı S., Güneş H., Rist U.

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, vol.44, pp.42-59, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44
  • Publication Date: 2014
  • Doi Number: 10.1016/j.euromechflu.2013.10.003
  • Journal Name: EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.42-59
  • Keywords: Active flow control, Zero-net-mass-flux, Jet and vortex actuator, Boundary layer, Dynamic mesh, Computational fluid dynamics, SYNTHETIC JET, SEPARATION CONTROL, ACTIVE CONTROL, GENERATOR
  • Istanbul Technical University Affiliated: Yes

Abstract

The performance of a zero-net-mass-flux Jet and Vortex Actuator (JaVA) was numerically investigated in a two-dimensional-cross-flow flat-plate laminar boundary layer. The JaVA is an active flow control device that can be used for flow separation control and thus can delay/prevent boundary layer separation. In this study, an unsteady, incompressible flow solver has been used to study the flow fields generated by a JaVA in a water channel. Detailed quantitative information about the performance of the JaVA on a flat-plate boundary layer is obtained. JaVA-induced boundary-layer profiles are clearly 'fuller' at the wall and hence more resistant to flow separation. The 'positive' effects of the JaVA with different operating regimes on various boundary-layer flow characteristics such as displacement thickness, shape factor and the friction coefficient are presented in this study. Selecting the appropriate governing parameters in conjunction with cross-flow properties, the velocity profile can be tuned in a boundary layer to delay or prevent separation. (C) 2013 Elsevier Masson SAS. All rights reserved.