Lagrange method in shape optimization for non-linear partial differential equations: A material derivative free approach
- Sturm, Kevin
2010 Mathematics Subject Classification
- 49Q10 49Q12
- Lagrange approach, shape derivative, non-linear partial differential equations, material derivative
This paper studies the relationship between the material derivative method, the shape derivative method, the min-max formulation of Correa and Seeger, and the Lagrange method introduced by Céa. A theorem is formulated which allows a rigorous proof of the shape differentiability without the usage of material derivative; the domain expression is automatically obtained and the boundary expression is easy to derive. Furthermore, the theorem is applied to a cost function which depends on a quasi-linear transmission problem. Using a Gagliardo penalization the existence of optimal shapes is established.