Figure A1. (a) A 3D control volume with 24 integration points, (b) neighbor nodal points and auxiliary coordinates around ip=2, (c) neighbor nodal points and auxiliary coordinates around ip=12, (d) a 3D control volume with 6 integration points, (e) a 2D control volume with 4 integration points, (f) a 1D control volume with 2 integration points and (g) a 2D boundary control volume

From

The Extension of the QL Method to Solve the Radiative Heat Transfer Problem in a 3D Square Enclosure Containing Non-grey Gas

Pedram Tazraei

American Journal of Mechanical Engineering. 2016, 4(2), 71-81 doi:10.12691/ajme-4-2-5