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Atmospheric and Oceanic Optics

, Volume 29, Issue 3, pp 234–243 | Cite as

Turbulence structure over heated surfaces: Numerical solutions

  • V. V. NosovEmail author
  • V. P. Lukin
  • E. V. Nosov
  • A. V. Torgaev
Optics of Stochastically-Heterogeneous Media

Abstract

The structure of air turbulent motions inside closed volumes (without exchange of material through the boundary) over inhomogeneously heated underlying surfaces is studied by the numerical solution of boundary problems for hydrodynamics equations (Navier–Stokes). Large solitary vortices (coherent structures, topological solitons) are observed over inhomogeneously heated surfaces. The number of vortices and their internal structure depend on the form and size of heated inhomogenities. In the case of simple forms of heating (homogeneous heating, a round heated spot), a coherent turbulence induced by the decay of coherent vortices is observed inside a closed volume. For complex forms of heating (thermal diversity), the toroidal vortices are noticeably deformed. The vortices can be extended along the surface and have spiral (helix) streamlines. The vortices are noticeably mixed during the evolution, which results in a Kolmogorov (incoherent) turbulence. Experimental data received earlier inside dome rooms of astronomical telescopes confirm our numerical simulation.

Keywords

turbulence coherent turbulence coherent structure topological soliton simulation of coherent structures Navier–Stokes equations inhomogeneously heated surface thermal diversity 

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • V. V. Nosov
    • 1
    Email author
  • V. P. Lukin
    • 1
  • E. V. Nosov
    • 1
  • A. V. Torgaev
    • 1
  1. 1.V.E. Zuev Institute of Atmospheric Optics, Siberian BranchRussian Academy of SciencesTomskRussia

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