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

Table 5

Numerical error and convergence rate (Δ𝑡=𝐶ℎ²).

Mesh	5×5		10×10		20×20		40×40
Norm type	Error	Rate	Error	Rate	Error	Rate	Error	Rate
‖𝐶‖𝑙^2(𝐿^2)	8.48𝑒−5	—	2.13𝑒−5	1.995	5.37𝑒−6	1.986	1.36𝑒−6	1.971
‖𝐶‖𝑙^∞(𝐿^2)	1.34𝑒−2	—	3.37𝑒−3	1.989	8.56𝑒−4	1.978	2.21𝑒−4	1.952