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http://dx.doi.org/10.3795/KSME-B.2005.29.11.1189

Response of Spatially Developing Turbulent Boundary Layer to Spanwise Oscillating Electromagnetic Force  

Lee, Joung-Ho (한국과학기술원 기계공학과)
Sung, Hyung Jin (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.11, 2005 , pp. 1189-1198 More about this Journal
Abstract
Direct numerical simulations were performed to investigate the physics of a spatially developing turbulent boundary layer flow subjected to spanwise oscillating electromagnetic forces in the near wall region. A fully implicit fractional step method was employed to simulate the flow. The mean flow properties and the Reynolds stresses were obtained to analyze the near-wall turbulent structure. It is found that skin friction and turbulent kinetic energy can be reduced by the electromagnetic forces. The decrease in production is responsible fur the reduction of turbulent kinetic energy. Instantaneous flow visualization techniques were used to observe the response of streamwise vortices and streak structures to spanwise oscillating forces. The near-wall vortical structures are affected by spanwise oscillating electromagnetic forces. Following the stopping of the electromagnetic force, the flow eventually relaxes back to a two-dimensional equilibrium boundary layer.
Keywords
Drag Reduction; Electromagnetic Force; Spanwise Oscillation; Direct Numerical Simulation; Turbulent Boundary Layer;
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