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To do this, first display your mesh on the screen: Solution Setup - General; click on "Display" and select "fluid" as the surface.  Press Display again, and then close the dialogue. Image Added

Go to Adapt - Region at the top menu In Adapt menu, select Region. Select Controls, set the Max Level of Refine to 1 and click "OK". Image Added
Then, click Select Points with Mouse, and right-click with your mouse just below the bottom left corner and just above the top right corner of the mesh so that the entire mesh is selected for grid adaption. Image Added
Finally, click Adapt. Modify discretization scheme at Solution Methods tab on the left of screen (or equivalently in the menu, select Solve → Methods.)Display your newly adapted mesh: Solution Setup - General; click on "Display" and select "fluid" as the surface. Press Display again, and then close the dialogue. The mesh should now look like ths: Image Added

To accelerate convergence and just solve the flow equations initially without turbulence, go to Solution - Solution Controls - Equations. Unselect Turbulence and press OK.  

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