Convective layered flows of a vertically whirling viscous incompressible fluid. Velocity field investigation

N. V. Burmasheva ; E. Yu. Prosviryakov

Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 23 (2019) no. 2, pp. 341-360.

Résumé

This article discusses the solvability of an overdetermined system of heat convection equations in the Boussinesq approximation. The Oberbeck–Boussinesq system of equations, supplemented by an incompressibility equation, is overdetermined. The number of equations exceeds the number of unknown functions, since non-uniform layered flows of a viscous incompressible fluid are studied (one of the components of the velocity vector is identically zero). The solvability of the non-linear system of Oberbeck–Boussinesq equations is investigated. The solvability of the overdetermined system of non-linear Oberbeck–Boussinesq equations in partial derivatives is studied by constructing several particular exact solutions. A new class of exact solutions for describing three-dimensional non-linear layered flows of a vertical swirling viscous incompressible fluid is presented. The vertical component of vorticity in a non-rotating fluid is generated by a non-uniform velocity field at the lower boundary of an infinite horizontal fluid layer. Convection in a viscous incompressible fluid is induced by linear heat sources. The main attention is paid to the study of the properties of the flow velocity field. The dependence of the structure of this field on the magnitude of vertical twist is investigated. It is shown that, with nonzero vertical twist, one of the components of the velocity vector allows stratification into five zones through the thickness of the layer under study (four stagnant points). The analysis of the velocity field has shown that the kinetic energy of the fluid can twice take the zero value through the layer thickness.

Détail

Keywords: layered convection, tangential stress, counterflow, Oberbeck–Boussinesq equation system, vertical twist.
Mots-clés : exact solution, stagnation point, stratification

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