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مکانیک::
زیربحرانی
The Reynolds number range 300subcritical in which the vortex street is fully turbulent while the boundary layers are laminar.
In the subcritical range, the vortex street is well-organised and the vortices are shed orderly and periodically at an approximately constant Strouhal number of St≈0.2.
Increasing Re decreases the mean drag coefficient, until the flow enters the subcritical range where the wake becomes fully turbulent
Highlighting the subcritical region of Figure 2.3 emphasizes the fact that strong and periodic vortex-shedding occurs in this range.
[77] further highlighted various figure-of-eight patterns in different subcritical and supercritical Reynolds number (Re) ranges (1.5x104 < Re < 6x104 and 3.2x105 < Re < 7.1x105) and described a figure-eight occurrence as a representation of "dual resonance".
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