Keenan, Philip T.2018-06-182018-06-181994-05Keenan, Philip T.. "An Efficient Postprocessor for Velocities from Mixed Methods on Triangular Elements." (1994) <a href="https://hdl.handle.net/1911/101837">https://hdl.handle.net/1911/101837</a>.https://hdl.handle.net/1911/101837Certain finite difference methods on rectangular grids for second order elliptic equations are known to yield superconvergent flux approximations. A class of related finite difference methods have recently been defined for triangular meshes by applying special quadrature rules to an extended version of a mixed finite element method [1]; the flux vector fields from these methods are not superconvergent. This report presents empirical evidence indicating that a simple local postprocessing technique recovers higher order accurate vector velocities at element centers on many meshes of triangular elements, with approximately second order accuracy on three lines meshes.12 ppengTechnical reportTR94-22