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Simulations of Hairpin Vortices in the Presence of a Passive Scalar

[+] Author Affiliations
Robert A. Handler

George Mason University, Fairfax, VA

David B. Goldstein, Saikishan Suryanarayanan

University of Texas at Austin, Austin, TX

Paper No. FEDSM2018-83158, pp. V001T08A001; 8 pages
doi:10.1115/FEDSM2018-83158
From:
  • ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting
  • Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fluid Dynamics of Wind Energy; Bubble, Droplet, and Aerosol Dynamics
  • Montreal, Quebec, Canada, July 15–20, 2018
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5155-5
  • Copyright © 2018 by ASME

abstract

We have performed simulations of hairpin vortex evolution in a channel flow in which a passive scalar was present. The hairpin was created by disturbing the flow using an impulsive and spatially localized body force. Simultaneous with the introduction of the force, a passive scalar was introduced. The simulations were performed using a spectral code at a Reynolds numbers of 3000. The results show that a significant fraction of the scalar material is spontaneously trapped in the core of a hairpin vortex. This can be understood by recalling that vortex lines are material lines in flows for which the effects of diffusion are small. We will also discuss the possible implications of these observations with respect to the introduction of active scalars coincident with regions of concentrated vorticity.

Copyright © 2018 by ASME

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