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bluff
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dont bluff
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poplar bluff
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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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