2 results
Search Results
Now showing 1 - 2 of 2
- ItemAnalysis and optimal boundary control of a nonstandard system of phase field equations(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2012) Colli, Pierluigi; Gillardi, Gianni; Sprekels, JürgenWe investigate a nonstandard phase field model of Cahn-Hilliard type. The model, which was introduced in [16], describes two-species phase segregation and consists of a system of two highly nonlinearly coupled PDEs. It has been studied recently in [5], [6] for the case of homogeneous Neumann boundary conditions. In this paper, we investigate the case that the boundary condition for one of the unknowns of the system is of third kind and nonhomogeneous. For the resulting system, we show well-posedness, and we study optimal boundary control problems. Existence of optimal controls is shown, and the first-order necessary optimality conditions are derived. Owing to the strong nonlinear couplings in the PDE system, standard arguments of optimal control theory do not apply directly, although the control constraints and the cost functional will be of standard type.
- ItemGlobal existence of solutions to Keller--Segel chemotaxis system with heterogeneous logistic source and nonlinear secretion(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2021) Arumgam, Gurusamy; Dond, Asha K.; Erhardt, André H.We study the following Keller-Segel chemotaxis system with logistic source and nonlinear secretion. For this system, we prove the global existence of solutions under suitable assumptions.