Abstract
We study the first and second boundary value problems and the transmission problem for the complex potential of a two-dimensional filtration flow in an anisotropic and inhomogeneous (variable permeability and thickness) porous layer. The flow sources are arbitrary discrete and can generally be located both on the boundaries and outside the boundaries. The boundaries are modeled by arbitrary smooth (piecewise smooth) closed lines, and the flow sources are singularities (isolated singular points) of the complex potential. The presence of a system of sources on the boundaries leads to a fundamentally new generalization (complication) of the boundary conditions, which are characterized by singular functions with isolated singular points. In the case of an anisotropic homogeneous (constant permeability and thickness) layer and rectilinear boundaries, the solutions of the problems are presented in closed form. In the general case, when an arbitrary smooth closed curve models a boundary with sources located on it, a generalized Cauchy type integral for the complex flow potential is used. This permitted reducing the second boundary value problem and the transmission problem to boundary singular integral equations. The problems studied are mathematical models of two-dimensional filtration processes in layered porous media, which are of interest, for example, for the practice of extracting fluids (oil, water) from natural anisotropically heterogeneous soil layers.
Notes
The points \(\zeta _0=\{\zeta _{01},\zeta _{02},\ldots ,\zeta _{0n }\}\) are the images of the isolated singular points \(z_0=\{z_{01},z_{02},\ldots ,z_{0n}\} \) of location of sources given on the \(z \)-plane, which are related by the homeomorphic transformation \( \zeta _0=\zeta (z_0)\).
The functions \(\varphi (\zeta ) \) and \(\psi (\zeta ) \) satisfy system (2.4) with given constant coefficients \(\sqrt {D(P_s)} \) and \(\sqrt {D(P_a)} \).
REFERENCES
Lifanov, I.K., Metod singulyarnykh integral’nykh uravnenii i chislennyi eksperiment (Method of Singular Integral Equations and Numerical Experiment), Moscow: Yanus, 1995.
Dimitroglo, M.G., Setukha, A.V., and Lifanov, I.K., On numerical modelling of a three-dimensional flow past a wing with external flow suction and on the effect of flow suction on trailing vortices, Russ. J. Numer. Anal. Math. Model., 2004, vol. 19, no. 2, pp. 109–129.
Lifanov, I.K. and Setukha, A.V., On singular solutions of some boundary value problems and of singular integral equations, Differ. Equations, 1999, vol. 35, no. 9, pp. 1242–1255.
Polubarinova-Kochina, P.Ya., Teoriya dvizheniya gruntovykh vod (Theory of Groundwater Motion), Moscow: Nauka, 1977.
Piven’, V.F. and Kostin, O.V., Filtration flows with sources on impermeable canonical boundaries, in Tr. Mezhdunar. shkol-seminarov “Metody diskretnykh osobennostei v zadachakh matematicheskoi fiziki.” Vyp. 7 (Proc. Int. Semin. Sch. “Methods of Discrete Singularities in Problems of Mathematical Physics.” Issue 7), Orel, 2009, pp. 92–98.
Detkova, Yu.V. and Nikol’skii, D.N., Investigation of the operation of a water intake near a source of pollution located on a circle, in Tr. Mezhdunar. shkol-seminarov “Metody diskretnykh osobennostei v zadachakh matematicheskoi fiziki.” Vyp. 7 (Proc. Int. Semin. Sch. “Methods of Discrete Singularities in Problems of Mathematical Physics.” Issue 7), Orel, 2009, pp. 46–51.
Piven’, V.F., Problems on plane-parallel filtration flows with sources at the boundaries, Differ. Equations, 2020, vol. 56, no. 9, pp. 1181–1192.
Piven’, V.F., Investigation of three-dimensional fluid filtration problems with sources on the boundaries, Differ. Equations, 2021, vol. 57, no. 9, pp. 1214–1230.
Piven’, V.F., Two-dimensional boundary value problems for filtration flows with randomly located sources in an inhomogeneous porous layer, Differ. Equations, 2022, vol. 58, no. 8, pp. 1126–1141.
Piven’, V.F., Matematicheskie modeli fil’tratsii zhidkosti (Mathematical Models of Fluid Filtration), Orel: Orlovsk. Gos. Univ. im. I.S. Turgeneva, 2015.
Radygin, V.M. and Golubeva, O.V., Primenenie funktsii kompleksnogo peremennogo v zadachakh fiziki i tekhniki (Application of Functions of Complex Variable in Problems of Physics and Technology), Mow: Vyssh. Shkola, 1983.
Vekua, I.A., Obobshchennye analiticheskie funktsii (Generalized Analytic Functions), Moscow: Nauka, 1988.
Piven’, V.F., Teoriya i prilozheniya matematicheskikh modelei fil’tratsionnykh techenii zhidkosti (Theory and Applications of Mathematical Models of Fluid Filtration Flows), Orel: Orlovsk. Gos. Univ. im. I.S. Turgeneva, 2006.
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by V. Potapchouck
Rights and permissions
About this article
Cite this article
Piven’, V.F. Two-Dimensional Fluid Filtration Problems with Boundary Sources in an Anisotropic Inhomogeneous Layer. Diff Equat 59, 781–798 (2023). https://doi.org/10.1134/S0012266123060071
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0012266123060071