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JOURNALS // Doklady Rossijskoj Akademii Nauk. Mathematika, Informatika, Processy Upravlenia // Archive

Dokl. RAN. Math. Inf. Proc. Upr., 2025 Volume 526, Pages 3–7 (Mi danma725)

MATHEMATICS

Boundary value problem for the stationary thermal diffusion model with variable coefficients

G. V. Alekseevab, V. V. Pukhnachevc

a Institute for Applied Mathematics, Far Eastern Branch, Russian Academy of Sciences, Vladivostok
b Far Eastern Federal University, Vladivostok
c Lavrentyev Institute of Hydrodynamics of Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The global solvability and local uniqueness of a new boundary value problem for a stationary thermal diffusion model with variable coefficients, taking into account the Soret effect, are proven. A priori estimates of the norms of the main components of the solution are derived and analyzed, depending on the norms of the problem data and the leading coefficients of the model. A special dependence of the solution on the modulus of the Soret coefficient is established.

Keywords: differential equations, heat and mass transfer, thermal diffusion, boundary value problem, variable coefficients, solvability, uniqueness, Soret coefficient.

UDC: 517.958

Received: 06.11.2025
Revised: 17.11.2025
Accepted: 17.11.2025

DOI: 10.7868/S3034504925060013



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© Steklov Math. Inst. of RAS, 2026