A discrete duality finite volume approach to hodge decomposition and div-curl problems on almost arbitrary two-dimensional meshes

We de. ne discrete differential operators such as gradient, divergence, and curl, on general two-dimensional nonorthogonal meshes. These discrete operators verify discrete analogues of usual continuous theorems: discrete Green formulae, discrete Hodge decomposition of vector fields, and vector curls have a vanishing divergence and gradients have a vanishing curl. We apply these ideas to discretize div-curl systems. We give error estimates based on the reformulation of these systems into equivalent equations for the potentials. Numerical results illustrate the use of the method on several types of meshes, some of which are degenerating triangular meshes and nonconforming locally refined meshes.