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- W3208396987 abstract "We consider a space–time adaptive splitting scheme for polycrystallization processes described by a two-field phase field model. The phase field model consists of a coupled system of evolutionary processes for the local degree of crystallinity ϕ and the orientation angle Θ one of them being of first order total variation flow type. The splitting scheme is based on an implicit discretization in time which allows a decoupling of the system in the sense that at each time step minimization problems in ϕ and Θ have to be solved successively. The discretization in space is taken care of by a standard finite element approximation for the problem in ϕ and an Interior Penalty Discontinuous Galerkin (IPDG) approximation for the one in Θ. The adaptivity in space relies on equilibrated a posteriori error estimators for the discretization errors in ϕ and Θ in terms of primal and dual energy functionals associated with the respective minimization problems. The adaptive time stepping is dictated by the convergence of a semismooth Newton method for the numerical solution of the nonlinear problem in Θ. Numerical results illustrate the performance of the adaptive space–time splitting scheme for two representative polycrystallization processes." @default.
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- W3208396987 date "2022-04-01" @default.
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- W3208396987 title "Space–time adaptive splitting scheme for the numerical simulation of polycrystallization" @default.
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