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

P0017: Convectons

  • Stefan Zammert, Philipps-Universität Marburg
  • Bruno Eckhardt, Philipps-Universität Marburg
DOI: https://doi.org/10.1103/APS.DFD.2015.GFM.P0017

The asymptotic suction boundary layer over a uniformly heated plate shows a subcritical instability of the conductive state. The spatially extended convection state undergoes a three-dimensional long-wavelength instability for decreasing Rayleigh number that leads to a doubly-localized equilibrium solution – the so-called convecton.  The convecton is an exact solution of the equations with circular convection rolls.                                         

The state is visualized via iso-surfaces of the absolute value of the wall-normal velocity. The surfaces are color-coded according to the distance to the plate. The Rayleigh number decreases from upper left to lower right. 

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