The system of equations of one-dimensional unsteady fluid motion in a viscous heat-conducting medium is considered. The mathematical model is based on the equations of conservation of mass for liquid and solid phases, Darcy’s law, rheological relation, the law of conservation of balance of forces and the equation for the temperature of the medium. The transition to Lagrange variables in the case of an incompressible fluid allows us to reduce the initial system of governing equations to a third-order equation for porosity and a second-order equation for temperature, respectively. A calculation algorithm is proposed and a numerical study of the obtained initial - boundary value problem is carried out.
The paper considers a two-dimensional mathematical model of filtration of a viscous incompressible liquid or gas in a porous medium. A unique feature of the model under consideration is the incorporation of poroelastic properties of the solid skeleton. From a mathematical point of view, the equations of mass conservation for liquid / gaseous and solid phases, Darcy's law, the rheological ratio for a porous medium, and the conservation law of the balance of forces are considered. The work is aimed at numerical study of the model initial-boundary value problem of carbon dioxide injection into the rock with minimum initial porosity. Also, it is necessary to find out the parameters at which the porosity will increase in the upper layers of the rock and, as a result, the gas will come to the surface. Section 1 contains a statement of the problem and a brief review of scientific papers related to this topic. In Section 2, the original system of constitutive equations is transformed. In the case of slow flows, when the convective term can be neglected, a system arises that consists of a second-order parabolic equation for the effective pressure of the medium and a first-order equation for porosity. Section 3 presents the results and conclusions of a numerical study of the initial-boundary value problem.
Процесс фильтрации жидкости в деформируемой пористой среде описывается системой, состоящей из уравнений сохранения массы для жидкой и твердой фаз, закона Дарси, реологического соотношения типа Максвела и закона сохранения баланса сил. Предполагается, что пороупругая среда обладает преимущественно вязкими свойствами и плотности фаз являются постоянными. В случае одной пространственной переменной переход к переменным Лагранжа позволяет свести исходную систему определяющих уравнений к одному уравнению для искомой пористости. Целью работы является численное исследование возникающей начально-краевой задачи. В пункте 1 дается постановка задачи и краткий обзор литературы по близким к данной теме работам. В пункте 2 проводится преобразование системы уравнений, в результате которого для пористости возникает нелинейное уравнение третьего порядка. В пункте 3 предложен алгоритм численного решения одномерной начально-краевой задачи. Для численной реализации используется однородная разностная схема для уравнения второго порядка с переменными коэффициентами и схема Рунге — Кутта второго порядка аппроксимации. Полученное решение удовлетворяет физическому принципу максимума. В пункте 4 рассматривается более общий случай сведения исходной системы к одному уравнению.DOI 10.14258/izvasu(2018)4-11
The paper considers a two-dimensional mathematical model of filtration of a viscous incompressible fluid in a deformable porous medium. The model is based on the equations of conservation of mass for liquid and solid phases, Darcy’s law, the rheological relationship for a porous medium, and the law of conservation of the balance of forces. In this article, the equation of the balance of forces is taken in full form, i.e. the viscous and elastic properties of the medium are taken into account. The aim of the work is a numerical study of a model initial-boundary value problem. Section 1 gives a statement of the problem and a brief review of the literature on works related to this topic. In item 2, the original system of equations is transformed. In the case of slow flows, when the convective term can be neglected, a system arises that consists of a second-order parabolic equation for the effective pressure of the medium and the first-order equation for porosity. Section 3 proposes an algorithm for the numerical solution of the resulting initial-boundary value problem. For the numerical implementation, a variable direction scheme for the heat equation with variable coefficients is used, as well as the Runge — Kutta scheme of the fourth order of approximation.
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