  In a companion paper, a reduced model for propagation of acoustic waves in a
cloud of inertial cavitation bubbles was proposed. The wave attenuation was
calculated directly from the energy dissipated by a single bubble, the latter
being estimated directly from the fully nonlinear radial dynamics. The use of
this model in a mono-dimensional configuration has shown that the attenuation
near the vibrating emitter was much higher than predictions obtained from
linear theory, and that this strong attenuation creates a large traveling wave
contribution, even for closed domain where standing waves are normally
expected. In this paper, we show that, owing to the appearance of traveling
waves, the primary Bjerknes force near the emitter becomes very large and tends
to expel the bubbles up to a stagnation point. Two-dimensional axi-symmetric
computations of the acoustic field created by a large area immersed sonotrode
are also performed, and the paths of the bubbles in the resulting Bjerknes
force field are sketched. Cone bubble structures are recovered and compare
reasonably well to reported experimental results. The underlying mechanisms
yielding such structures is examined, and it is found that the conical
structure is generic and results from the appearance a sound velocity gradient
along the transducer area. Finally, a more complex system, similar to an
ultrasonic bath, in which the sound field results from the flexural vibrations
of a thin plate, is also simulated. The calculated bubble paths reveal the
appearance of other commonly observed structures in such configurations, such
as streamers and flare structures.
