  We present an analog model for the Ba\~nados, Teitelboim, Zanelli (BTZ) black
hole based on a hydrodynamical flow. We numerically solve the fully nonlinear
hydrodynamic equations of motion and observe the excitation and decay of the
analog BTZ quasinormal modes in the process. We consider both a small
perturbation in the steady state configuration of the fluid and a large
perturbation; the latter could be regarded as an example of formation of the
analog (acoustic) BTZ black hole.
