  Relativistic hydrodynamics represents a powerful tool to investigate the time
evolution of the strongly interacting quark gluon plasma created in
ultrarelativistic heavy ion collisions. The equations are solved often
numerically, and numerous analytic solutions also exist. However, the inclusion
of viscous effects in exact, analytic solutions has received less attention.
Here we utilize Hubble flow to investigate the role of bulk viscosity, and
present different classes of exact, analytic solutions valid also in the
presence of dissipative effects.
