Showing items with similar title or keywords.

• On the approximation of the boundary control in two-phase Stefan-type problems 

  Neittaanmäki, Pekka; Tiba, D. (Polish Academy of Sciences, 1987)

  The paper is concerned with boundary control of two-phase Stefan problems. A construction of optimal solutions, based on exploiting regularization techniques, is presented. Results of some numerical experiments are discussed.

• A two-phase problem with Robin conditions on the free boundary 

  Guarino Lo Bianco, Serena; La Manna, Domenico Angelo; Velichkov, Bozhidar (Les Éditions de l'École polytechnique, 2021)

  We study for the first time a two-phase free boundary problem in which the solution satisfies a Robin boundary condition. We consider the case in which the solution is continuous across the free boundary and we prove an ...

• Optimal control for state constrained two-phase Stefan problems 

  Neittaanmäki, Pekka; Tiba, Dan (Birkhäuser, 1991)

  We give a new approach to state constrained control problems associated to non-degenerate nonlinear parabolic equations of Stefan type. We obtain uniform estimates for the violation of the constraints.

• On the convergence of the finite element approximation of eigenfrequencies and eigenvectors to Maxwell's boundary value problem 

  Neittaanmäki, Pekka; Picard, Rainer (Suomalainen tiedeakatemia, 1981)

• Functional Type Error Control for Stabilised Space-Time IgA Approximations to Parabolic Problems 

  Langer, Ulrich; Matculevich, Svetlana; Repin, Sergey (Springer International Publishing, 2018)

  The paper is concerned with reliable space-time IgA schemes for parabolic initial-boundary value problems. We deduce a posteriori error estimates and investigate their applicability to space-time IgA approximations. ...