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

Understanding spectral states of sub-Keplerian accretion discs around compact objects as transitions between steady states