WELL-POSEDNESS, CONTROL AND COMPUTATION OF A ONE-PHASE STEFAN PROBLEM WITH NEUMANN CONDITION Academic Article uri icon

abstract

  • SynopsisA one-phase Stefan problem can be reduced to an equivalent variational inequality by using the Baiocchi-Duvaut transformation. In this paper, we study the variational inequality by formulating it as a set-valued partial differential equation. The existence of solutions is proved by applying a generalized Schauder fixed fixed point theorem for set-valued mappings. Uniqueness and regularity of solutions are also obtained. In 3, we regard the boundary value Neumann data as boundary controls and combine both the variational inequality and the classical approaches to study the effects of controls on the free boundary and the state (i.e. temperature). In 4, we further use the theory to study an optimal ice-melting problem. Our results show that if the controls have fixed total input heat flux and are constrained in magnitude, then the optimal control is bang-bang. If the admissible controls are not constrained in magnitude, then the optimal control is a Dirac delta type distribution which is no longer admissible. In the last section, our existence theory is combined with the finite difference method and non-linear programming techniques to obtain numerical solutions.

published proceedings

  • PROCEEDINGS OF THE ROYAL SOCIETY OF EDINBURGH SECTION A-MATHEMATICS

author list (cited authors)

  • CHEN, G. N., SUN, S. H., & ZHENG, Q.

citation count

  • 1

complete list of authors

  • CHEN, GN||SUN, SH||ZHENG, Q

publication date

  • January 1984