A Posteriori Error Analysis Via Duality Theory: With by Weimin Han

By Weimin Han

This quantity presents a posteriori blunders research for mathematical idealizations in modeling boundary worth difficulties, specifically these coming up in mechanical purposes, and for numerical approximations of diverse nonlinear variational difficulties. the writer avoids giving the implications within the so much normal, summary shape in order that it's more uncomplicated for the reader to appreciate extra sincerely the basic principles concerned. Many examples are incorporated to teach the usefulness of the derived errors estimates.

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Mechanics is a rich source of variational inequalities (cf. g. [125]), and some examples of problems that give rise to variational inequalities are obstacle and contact problems, plasticity and visco-plasticity problems, Stefan problems, unilateral problems of plates and shells, and non-Newtonian flows involving Bingham fluids. An early comprehensive reference on the topic is 1471, where many nonlinear boundary value problems in mechanics and physics are formulated and studied in the framework of variational inequalities.

24 Let V be a Hilbert space and let K c V be a non-empty, convex, closed subset. Assume a : V x V + JR is a continuous, V-elliptic bilinear form and e : V -+ R is a linear continuous functional. 25 Let V be a Hilbert space. c. on V and e : V -+ IR is a linear continuousfunctional. 28). Therefore, elliptic variational inequalities of the first kind can be viewed as special cases of elliptic variational inequalities of the second kind. 29) where j is a real valued functional. In this connection, one can also study the following mixed type variational inequality where the set K, the bilinear form a ( .

Is symmetric if a ( u ,v ) = a ( v ,u ) V u , v E V. For a ( . 17). THEOREM 1-16 (Lax-Milgram Lemma) Let V be a Hilbert space. Assume a ( . , -) is a bounded, V-elliptic bilinear form on V, t! E V*. 17). 17). With the Lax-Milgram lemma, it is easy to show that these problems all admit a unique solution. 6). The Lax-Milgram lemma can be applied for an existence and uniqueness study of more general linear elliptic partial differential equations. Consider the boundary value problem 19 Preliminaries Here v = (y, .

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