Quadratic Upwind Interpolation for Convective Kinematics When interpolating between point P and E of a control volume, use parabola instead of straight line. Need three points: third point taken on upstream side (opposite direction of flow) $ \phi_e=\phi_U+g_1(\phi_D-\phi_U)+g_2(\phi_U-\phi_{UU}) $ - Has third-order truncation error on uniform and non-uniform grids