Element

Linear

Quadratic

Lagrangian


Grid \(N_\text{e}\)

\(62\times 62\times 47\)

\(26\times 26\times 20\)

\(26\times 26\times 20\)

DoF

561,519

172,680

338,352

NNZE

9,291,615

6,979,448

17,158,968

Assembly time

184.55 s

389.12 s

770.37 s

Total time

8046.82 s

2603.16 s

3877.8 s

\(\epsilon ^{\text{avg}}_\rho\)

\(12.77\%\)

\(0.26\%\)

\(0.22\%\)

\(\epsilon ^{\text{avg}}_\phi\)

\(3.29\%\)

\(2.3\%\)

\(2.3\%\)

 Times are shown in seconds, and the memory is presented in terms of the number of elements \(N_\text{e}\), the number of unknowns (DoF) and the number of nonzero entries for the global array NNZE. Average errors are shown for resistivity \(\epsilon ^{\text{avg}}_\rho\), and for the phase \(\epsilon ^{\text{avg}}_\phi\)