Variational-Hemivariational Inequalities: A Brief Survey on Mathematical Theory and Numerical Analysis
DOI:
https://doi.org/10.65135/atsf.2026.6Keywords:
Variational inequality, hemivariational inequality, variational-hemivariational inequality, well-posedness, numerical solution, finite element method, discontinuous Galerkin method, virtual element method, convergence, error estimate, contact mechanics, Stokes hemivariational inequality, Navier-Stokes hemivariational inequalityAbstract
Variational-hemivariational inequalities are an area full of interesting and challenging mathematical problems. The area can be viewed as a natural extension of that of variational inequalities. Variational-hemivariational inequalities are valuable for application problems from physical sciences and engineering that involve non-smooth and even set-valued relations, monotone or non-monotone, among physical quantities. In the recent years, there has been substantial growth of research interest in modeling, well-posedness analysis, development of numerical methods and numerical algorithms of variational-hemivariational inequalities. This survey paper is devoted to a brief account of well-posedness and numerical analysis results for variational-hemivariational inequalities. The theoretical results are presented for a family of abstract stationary variational-hemivariational inequalities and the main idea is explained for an accessible proof of existence and uniqueness. To better appreciate the distinguished feature of variational-hemivariational inequalities, for comparison, three mechanical problems are introduced leading to a variational equation, a variational inequality, and a variational-hemivariational inequality, respectively. The paper also comments on mixed variational-hemivariational inequalities, with examples from applications in fluid mechanics, and on results concerning the numerical solution of other types (nonstationary, history dependent) of variational-hemivariational inequalities.References
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