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We will patch the upper region downstream of the flow to create asymmetry so that we can obtain stable oscillation of vortex shedding faster.  

To do this, we will create a register to patch the Y velocity in downstream of  cylinder.

Main Menu > Adapt > Region...
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Enter 1 and 40 for X Min and X Max. Enter 0 and 10 for Y Min and Y Max. Click Mark. FLUENT will print the following message in the console window:
5416 cells marked for refinement, 0 cells marked for coarsening

 
Go to Step 6: Analyze Results

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