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Bulletin of Irkutsk State University. Series Mathematics, 2025 Volume 52, Pages 34–43 (Mi iigum607)

Integro-differential equations and functional analysis

The spectrum of the boundary value problem of two-dimensional thermal convection

V. K. Andreev, E. N. Lemeshkova

Institute of Computational Modeling SB RAS, Krasnoyarsk, Russian Federation

Abstract: The problem of two-dimensional fluid flow in a layer with a heated bottom is investigated. A seepage condition is set on the upper wall for the velocity. The velocity field is linear in the longitudinal coordinate, and the temperature and pressure fields are quadratic functions of the same coordinate. The analysis of the compatibility of the Navier-Stokes equations and thermal conductivity leads to a nonlinear eigenvalue problem for finding the flow field in the layer. The spectrum of this problem is constructed numerically for any permeability rates. The uniqueness of the solution, which is typical for problems of this kind, has been established. The structure of the flow in the layer is analyzed depending on the values of the Reynolds number.

Keywords: thermal convection, viscous heat-conducting liquid equations, inverse problem, spectrum of the boundary value problem.

UDC: 517.956: 532.5.032

MSC: 31B20, 76D05

Received: 16.07.2024
Revised: 28.08.2024
Accepted: 04.09.2024

DOI: 10.26516/1997-7670.2025.52.34



© Steklov Math. Inst. of RAS, 2026