A Rectangular Mixed Finite Element Method with a Continuous Flux for an Elliptic Equation Modelling Darcy Flow

Table 6

Mass error for concentration 𝐶(Δ𝑡=𝐶ℎ).

Mesh	5×5	10×10	20×20	40×40
Compute mass error	1.209𝑒−3	1.243𝑒−3	1.269𝑒−3	1.284𝑒−3
Relative mass error	2.068𝑒−2	5.427𝑒−3	1.487𝑒−3	4.371𝑒−4