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When a fluid flows toward the leading edge of a bluff body, the pressure in the fluid rises
from the free steam pressure to the stagnation pressure. When the flow speed is low, i.e. the
Reynolds number is low, pressure on both sides of the bluff body remains symmetric and no
turbulence appears. When the flow speed is increased to a critical value, pressure on both
sides of the bluff body becomes unstable, which causes a regular pattern of vortices, called
vortex street or Kármán vortex street as shown in Fig. 11. Certain transduction mechanisms
can be employed where vortices happen and thus energy can be extracted. Sanchez-Sanz et
al (2009) studied the feasibility of energy harvesting based on the Kármán vortex street and
proposed several design rules of such micro-resonator. This method is suitable both air flow
and liquid flow.
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