68th Annual Meeting of the APS Division of Fluid Dynamics (November 22, 2015 — November 24, 2015)

V0085: Numerical simulation of a round jet in crossflow of a spatially developing turbulent boundary layer triggered by realistic sandpaper roughness

  • Jesse Capecelatro, University of Illinois Urbana-Champaign
  • Daniel Bodony, University of Illinois Urbana-Champaign
  • Jonathan Freund, University of Illinois Urbana-Champaign
DOI: https://doi.org/10.1103/APS.DFD.2015.GFM.V0085

The Center for Exascale Simulation of Plasma-Coupled Combustion (XPACC) at the University of Illinois Urbana-Champaign is investigating the effects of plasma discharge on hydrogen combustion. Experiments are performed of a round jet in crossflow of spatially evolving turbulent boundary layer in a low-speed wind tunnel. Turbulence is triggered 11 inches upstream of the jet by a strip of 40-grit sandpaper.

In this video, a numerical simulation of the turbulence in the wind tunnel facility is presented. Locally structured, globally unstructured overset grids are used to match the geometry of the wind tunnel and round jet in a high-order finite difference framework. Bypass transition over the sandpaper is captured explicitly by deforming the grid randomly with amplitudes that correspond to the individual sand grains. The sandpaper is observed to trip the turbulence from an initially Blasius profile. Additionally, the air is observed to be entrained into the round jet and enhance the mixing. Velocity statistics at the location of the jet are in good agreement with the corresponding experiments.

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