  In high energy heavy ion collisions of RHIC and LHC, a strongly interacting
quark gluon plasma (sQGP) is created. This medium undergoes a hydrodynamic
evolution, before it freezes out to form a hadronic matter. The initial state
of the sQGP is determined by the initial distribution of the participating
nucleons and their interactions. Due to the finite number of nucleons, the
initial distribution fluctuates on an event-by-event basis. The transverse
plane anisotropy of the initial state can be translated into a series of
anisotropy coefficients or eccentricities: second, third, fourth-order
anisotropy etc. These anisotropies then evolve in time, and result in
measurable momentum-space anisotropies, to be measured with respect to their
respective symmetry planes. In this paper we investigate the time evolution of
the anisotropies. With a numerical hydrodynamic code, we analyze how the speed
of sound and viscosity influence this evolution.
