I. Theoretical Transitions Between Flow Patterns

 

 

A cylinder with a diameter D is placed in a flow with a velocity U in the direction of the x-axis, as shown on figure 1 below :

 

Figure 1 : Flow past the cylinder

The Reynolds number Re = UD/n characterizes the flow pattern past the cylinder, and the following transitions have been experimentally observed (e.g. see figure 2) :  

 

Figure 2 : Streaklines in the wake behind a cylinder for different Reynolds numbers.

Figure 3 : Vortices in the wake behind the cylinder (click on picture to animate)

 

 

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