Inner products in covolume and mimetic methods

Trapp, Kathryn A.

ESAIM: Modélisation mathématique et analyse numérique, Tome 42 (2008) no. 6, pp. 941-959.

A class of compatible spatial discretizations for solving partial differential equations is presented. A discrete exact sequence framework is developed to classify these methods which include the mimetic and the covolume methods as well as certain low-order finite element methods. This construction ensures discrete analogs of the differential operators that satisfy the identities and theorems of vector calculus, in particular a Helmholtz decomposition theorem for the discrete function spaces. This paper demonstrates that these methods differ only in their choice of discrete inner product. Finally, certain uniqueness results for the covolume inner product are shown.

Classification : 65N06
Mots clés : compatible discretization, discrete Helmholtz orthogonality, discrete exact sequence, mimetic method, covolume method

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