Poziv na predavanje na engleskom jeziku Exact solutions in optimal design problems for stationary diffusion equation

Odjel za matematiku Sveučilišta Josipa Jurja Strossmayera u Osijeku organizira predavanje Exact solutions in optimal design problems for stationary diffusion equation, na engleskom jeziku

NAJAVA – Predavanje će se održati u srijedu, 27. svibnja 2015. godine s početkom u 12 sati u predavaonici broj 2 na Odjelu za matematiku Sveučilišta Josipa Jurja Strossmayera u Osijeku (Trg Ljudevita Gaja 6).

Predavanje će održati:

• Krešimir Burazin, Associate Professor, Department of Mathematics, University of Osijek

We consider multiple state optimal design problems for stationary diffusion in the case of two isotropic phases, aiming to minimize a linear combination of compliances. Commonly, optimal design problems do not have classical solutions, so one considers proper relaxations of original problems. A relaxation by the homogenization method consists in introducing generalized materials, which are mixtures of original materials on the micro-scale.

It is well known that for problems with one state equation, there exist relaxed solutions which correspond to simple laminates at each point of the domain. As a consequence, one can write down a simpler relaxation, ending by a convex minimization problem.

For multiple state optimal design problems we derive analogous result in the spherically symmetric case. To be precise, we consider the simpler relaxation and prove that there exists corresponding optimal (relaxed) design which is a radial function, and which is also solution for proper relaxation of original problem. Moreover, we use the necessary and sufficient conditions of optimality to calculate this radial optimal design, and demonstrate the procedure on some examples of optimal design problems, where the presented method enables us to explicitly calculate the solution.