Optimal Control of a Hemivariational Inequality of Stationary Convective Brinkman-Forchheimer Extended Darcy equations with Numerical Approximation

Abstract: This paper studies an optimal control problem for a stationary convective Brinkman-Forchheimer extended Darcy (CBFeD) hemivariational inequality in two and three dimensions, subject to control constraints, and develops its numerical approximation. The hemivariational inequality provides the weak formulation of a stationary incompressible fluid flow through a porous medium, governed by the CBFeD equations, which account for convection, damping, and nonlinear resistance effects. The problem incorporates a non-leak boundary condition and a subdifferential friction-type condition. We first analyze the stability of solutions with respect to perturbations in the external force density and the superpotential. Next, we prove the existence of a solution to the optimal control problem, where the external force density acts as the control variable. We then propose a numerical scheme for solving the optimal control problem and establish its convergence. For concreteness, the numerical method is implemented using finite element discretization. Finally, we provide some numerical examples to validate the theory developed.