element
                emat =struct( ...
                        'porousMedia',this.mat.porousMedia(this.matID(el)), ...
                        'liquidFluid',this.mat.liquidFluid,...
                        'gasFluid',this.mat.gasFluid);
                pc_dofs = this.getElementDofs(el,1);
                pg_dofs = this.getElementDofs(el,2);
                elements(el) = RegularElement_H2_PcPg(...
                            this.NODE(this.ELEM{el},:), this.ELEM{el},...
                            this.t