Click Solve from the Setup tab:
Click the Physics tab.
Note: The default settings (incompressible, no heat transfer, 100 iterations) are appropriate for this scenario.
Click the Control tab.
Set Continue From = 0
Note: It is better to start from the beginning instead of continuing from saved results.
Click Solve to start the analysis.
A dialog will ask if you want to delete all results after iteration 0. Click Yes.