Electron. J. Differential Equations, Vol. 2022 (2022), No. 22, pp. 1-12.

Uniqueness for optimal control problems of two-dimensional second grade fluids

Adilson Almeida, Nikolai V. Chemetov, Fernanda Cipriano

Abstract:
We study an optimal control problem with a quadratic cost functional for non-Newtonian fluids of differential type. More precisely, we consider the system governing the evolution of a second grade fluid filling a two-dimensional bounded domain, supplemented with a Navier slip boundary condition. Under certain assumptions on the size of the initial data and parameters of the model, we prove second-order sufficient optimality conditions. Furthermore, we establish a global uniqueness result for the solutions of the first-order optimality system.

Submitted September 6, 2021. Published March 18, 2022.
Math Subject Classifications: 35R60, 49K20, 60G15, 60H15, 76D55.
Key Words: Second grade fluids; optimal control; uniqueness.

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Adilson Almeida
Centro de Matemática e Aplicações (CMA)
Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Portugal
email: ama.almeida@campus.fct.unl.pt
Nikolai V. Chemetov
Department of Computing and Mathematics
University of São Paulo
14040-901 Ribeirão Preto - SP, Brazil
email: nvchemetov@gmail.com
Fernanda Cipriano
Centro de Matemática e Aplica\c cões (CMA) FCT/UNL and
Departamento de Matemática
Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Portugal
email: cipriano@fct.unl.pt

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