Table 5 Errors and CPU performance of a fully implicit BDF2 scheme by using \(\pmb{(P_{2}, P_{1}, P_{2}dc)}\) finite element for \(\pmb{T=0.1}\) ,and \(\pmb{\triangle t=0.1h^{2}}\)

1/ h

\(\boldsymbol{\vert \!\vert \!\vert e_{\sigma} \vert \!\vert \!\vert _{\infty,0}}\)

\(\boldsymbol{\vert \!\vert \!\vert e_{\sigma} \vert \!\vert \!\vert _{0,0}}\)

\(\boldsymbol{\Vert e_{\mathbf{u}} \Vert _{\infty,0}}\)

\(\boldsymbol{\vert \!\vert \!\vert \nabla e_{u}\vert \!\vert \!\vert _{0,0}}\)

\(\boldsymbol{\vert \!\vert \!\vert e_{p}\vert \!\vert \!\vert _{0,0}}\)

CPU