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Table 1 Properties of the order of accuracy of gradient reconstruction and face midpoint value approximation on arbitrary grids

From: Accuracy analysis of gradient reconstruction on isotropic unstructured meshes and its effects on inviscid flow simulation

Approach second-order face midpoint value approximation guaranteed at least first-order gradient accuracy guaranteed
GG-Cell no no
GG-Node no no
GG-LSQ yes yes
GG-WTLI yes yes