Energy-variational structure in evolution equations
Authors
- Lasarzik, Robert
ORCID: 0000-0002-1677-6925
2020 Mathematics Subject Classification
- 35D99 35R35 35R45 35Q35 35Q74 76T06
Keywords
- Energy-variational solutions, measure-valued solutions, varifold-solutions, polyconvex elasticity, two-phase flow, Ericksen--Leslie equations
DOI
Abstract
We consider different measure-valued solvability concepts from the literature and show that they could be simplified by using the energy-variational structure of the underlying system of partial differential equations. In the considered examples, we prove that a certain class of improved measure-valued solutions can be equivalently expressed as an energy-variational solution. The first concept represents the solution as a high-dimensional Young measure, whether for the second concept, only a scalar auxiliary variable is introduced and the formulation is relaxed to an energy-variational inequality. We investigate four examples: the two-phase Navier--Stokes equations, a quasilinear wave equation, a system stemming from polyconvex elasticity, and the Ericksen--Leslie equations equipped with the Oseen--Frank energy. The wide range of examples suggests that this is a recurrent feature in evolution equations in general.
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