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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...
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
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