Geodesic
Analysis of the Wentzell stochastic system composed of the equations of unpressurised filtration in the hemisphere and at its boundary
Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie, Tome 17 (2024) no. 1, pp. 86-96

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The deterministic and stochastic Wentzell systems of Dzekzer equations in a hemisphere and on its boundary are studied for the first time. The deterministic case is characterised by the unambiguous solvability of the initial problem for the Wentzell system in a specific constructed Hilbert space. In the case of the stochastic hydrodynamic system “reservoir-well-collector”, the theory of Nelson–Glicklich derivative is applied and a stochastic solution is constructed, which allows us to determine the prognoses of quantitative changes in the geochemical regime of groundwater under non-pressure filtration. It should be noted that for the filtration system under study, the non-classical Wentzell condition is considered, since it is represented by an equation with the Laplace – Beltrami operator defined on the boundary of the domain, understood as a smooth compact Riemannian manifold without an edge, and the external influence is represented by the normal derivative of the function defined in the domain.
Keywords: wentzell system, nelson–Glicklich derivative.
Mots-clés : dzekzer equation 
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N. S. Goncharov; G. A. Sviridyuk. Analysis of the Wentzell stochastic system composed of the equations of unpressurised filtration in the hemisphere and at its boundary. Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie, Tome 17 (2024) no. 1, pp. 86-96. http://geodesic.mathdoc.fr/item/VYURU_2024_17_1_a7/