  The effects of cavitation on the flow around a circular-cylinder array are
studied by using a molecular dynamics simulation. Cavitation significantly
affects on vortex shedding characteristics. As the cavitation develops,the
vibration acting on the cylinders decreases and eventually disappears. The
further cavitation development generates a longer vapor region next to the
cylinders, and the vortex streets are formed at further positions from the
cylinders. The neighboring Karman vortexes are synchronized in the antiphase in
the absence of the cavitation. This synchronization is weakened by the
cavitation, and an asymmetric wake mode can be induced. These findings help
mechanical designs of fluid machinery that include cylinder arrays.
