  We numerically investigate the mean exit time of an inertial active Brownian
particle from a circular cavity with single or multiple exit windows. Our
simulation results witness distinct escape mechanisms depending upon the
relative amplitudes of the thermal length and self-propulsion length compared
to the cavity and pore sizes. For exceedingly large self-propulsion lengths,
overdamped active particles diffuse on the cavity surface, and rotational
dynamics solely governs the exit process. On the other hand, the escape
kinetics of a very weakly damped active particle is largely dictated by
bouncing effects on the cavity walls irrespective of the amplitude of
self-propulsion persistence lengths. We show that the exit rate can be
maximized for an optimal self-propulsion persistence length, which depends on
the damping strength, self-propulsion velocity, and cavity size. However, the
optimal persistence length is insensitive to the opening windows' size, number,
and arrangement. Numerical results have been interpreted analytically based on
qualitative arguments. The present analysis aims to understand the transport
controlling mechanism of active matter in confined structures.
