Affiliations: [a] CMAFCIO, Universidade de Lisboa, Portugal | [b] Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia. E-mail: antontsevsn@mail.ru | [c] FCT, Universidade do Algarve, Portugal. E-mail: holivei@ualg.pt | [d] Al-Farabi Kazakh National University, Kazakhstan. E-mail: konat_k@mail.ru
Abstract: A nonlinear initial and boundary-value problem for the Kelvin–Voigt equations with anisotropic diffusion, relaxation and absorption/damping terms is considered in this work. The global and local unique solvability of the problem was established in (J. Math. Anal. Appl. 473(2) (2019) 1122–1154). In the present work, we show how all the anisotropic exponents of nonlinearity and all anisotropic coefficients should interact with the problem data for the solutions of this problem display exponential and polynomial time-decays. We also establish the conditions for the solutions of this problem to blow-up in a finite time in three different cases: problem without convection, full anisotropic problem, and the problem with isotropic relaxation.
Keywords: Kelvin–Voigt equations, anisotropic diffusion, anisotropic relaxation, anisotropic damping, large time behavior, blow-up
