  We present here a simple hydrodynamic model based on a sequence of steady
states of the inner sub-Keplerian accretion disc to model its spectral states.
Correlations between different hydrodynamic steady states are studied with a
goal to understand the origin of, e.g., the aperiodic variabilities. The
plausible source of corona/outflow close to the central compact object is shown
to be a consequence of steady state transition in the underlying accretion
flow. We envisage that this phenomenological model can give insight on the
influence of environment on the inner sub-Keplerian accretion disc.
