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Analysis of Vortices Generation Process in Turbulent Boundary Subjected to Pressure Gradient

  • Artur DróżdżEmail author
  • Witold Elsner
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 23)

Abstract

The paper is concerned with the experimental study of bursting process in turbulent boundary layer. For this purpose the novel identification process, developed by Dróżdż and Elsner, J Phys: Conf Ser 318(6):062007, 2011, [3] based on VITA technique combined with quadrant analysis was applied. By the detection of four possible combinations of instantaneous gradients of u and v phase-averaged velocity traces this method allows to demonstrate such properties of vortices motion as: swirling direction, ascending or descending direction, the trajectory inclination. The analysis gives an evidence of four types of vortical structures present in the TBL which are responsible for the production of Q-type events, namely prograde and retrograde vortices, with the ascending and descending direction of motion. It was found that detected coherent structures have dominant share of the overall energy of velocity fluctuations.

Keywords

Turbulent Boundary Layer Vortical Structure Vortex Motion Quadrant Analysis Vortex Passing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The investigation was supported by National Science Centre under Grant no. DEC-2012/07/B/ST8/03791.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Institute of Thermal MachineryCzestochowa University of TechnologyCzestochowaPoland

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