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Theoretical investigation of coherent structures in stratified turbulent channel flow

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Abstract

A theoretical model is constructed of turbulent stratified flow in a flat horizontal channel with allowance for coherent structures that arise in it. The ordered part is separated from the turbulence of the flow and to describe the Reynolds-type equations are derived. The remaining part of the turbulence is taken into account parametrically in the form of an effective exchange coefficient. The flow is divided into a core, in which the ordered structures are manifested quite clearly, and wall regions, in which ordered large-scale structures are weakly manifested. To study the coherent structures in the core of the flow, an approach analogous to one already used to model ordered structures in open flows [4] is used. Monin-Obukhov scaling theory is used to describe the turbulence in the wall region.

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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 3, pp. 32–38, May–June, 1991.

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Kovalev, V.A., Ordanovich, A.E. Theoretical investigation of coherent structures in stratified turbulent channel flow. Fluid Dyn 26, 343–348 (1991). https://doi.org/10.1007/BF01059002

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Keywords

  • Theoretical Model
  • Channel Flow
  • Theoretical Investigation
  • Coherent Structure
  • Wall Region