A posteriori estimates for errors of functionals on finite volume   approximations to solutions of elliptic boundary value problems
  This article describes the extension of recent methods for a posteriori error estimation such as dual-weighted residual methods to node-centered finite volume discretizations of second order elliptic boundary value problems including upwind discretizations. It is shown how different sources of errors, in particular modeling errors and discretization errors, can be estimated with respect to a user-defined output functional. 
Lutz Angermann
math.NA