The Finite Volume Formulation for 2D Second-Order Elliptic
Problems with Discontinuous Diffusion/Dispersion Coefficients
Figure 6
Test case 1: error curves for the gradient approximation (left plot) and the solution approximation (right plot). Problem (2.1)-(2.2) is solved using mesh family and the isotropic diffusion tensor in (4.4).The errors obtained by average (3.18)-(3.19) are marked by circles, the errors obtained by using the weighted arithmetic average are marked by squares. Note that the two error curves are superimposed. In the bottom-left corners of both plots, we show the exact slopes proportional to and .
