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Click Mark then click Close. This will select the cells bounded by these four points, so we can change the initial condition in them. (Note: If you instead "patch" the region 0.5 < x < 32 and -5 < y < 5, the periodic vortex shedding starts much quicker).

Next, click Patch.

Complete the patching menu as shown below. This will change the initial Y component of velocity in the selected region from 0 to 0.2 m/s.



Click Patch,then click close.

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