  In view of late-time cosmic acceleration, a dark energy cosmological model is
revisited wherein Einstein's cosmological constant is considered as a candidate
of dark energy. Exact solution of Einstein field equations (EFEs) is derived in
a homogeneous isotropic background in classical general relativity. The
solution procedure is adopted, in a model independent way (or the cosmological
parametrization). A simple parametrization of the Hubble parameter (H) as a
function of cosmic time `t' is considered which produces an exponential type of
evolution of the scale factor (a) and also shows a negative value of
deceleration parameter at the present time with a signature flip from early
deceleration to late acceleration. Cosmological dynamics of the model obtained
have been discussed illustratively for different phases of the evolution of the
universe. The evolution of different cosmological parameters are shown
graphically for at and closed cases of Friedmann-Lemaitre-Robertson-Walker
(FLRW) space-time for the presented model (open case is incompatible to the
present scenario). We have also constrained our model parameters with the
updated (36 points) observational Hubble dataset.
