Abstract:
With help of the nonconforming
EQ1rot element and zero order Raviart-Thomas element,a new low order nonconforming mixed finite elements approximation scheme was proposed for the pseudo-hyperbolic equation, which can satisfy Brezzi-Babuska condition automatically.Based on the special characters of the interpolation operators of the elements, derivative transferring technique with respect to the time and interpolation post-processing technique, the superclose properties and superconvergence results with order
O(
h2) for the primitive solution in
H1-norm and the intermediate variable in
L2-norm were deduced separately for semi-discrete scheme. At the same time, the superclose properties with order
O(
h2+
τ2) and optimal order error estimates with order
O(
h+τ2) of original variable in
H1-norm and intermediate variable in
L2-norm were separately derived for a second order fully-discrete scheme.