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Under Details of "Edge Sizing", enter 60 for Number of Divisions. Under Bias select:

"--- --- - -" and when asked for the bias factor please enter 20.

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Similarly, specify element size of 0.015m for Edge Sizing 2. 

A bias was used for the vertical edges but not the horizontal edges to keep an optimum y+ value at the wall. This tutorial will not cover y+ values and their meanings, but it may be useful to know for future reference.

Click Update to generate the new mesh. Under Statistics, we should have mesh with 24,420 elements.
Image RemovedIf you refer back to the mesh details and expand statistics, you will notice that the number of elements has increased to 19536, compared to 5508 of the original mesh.
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Close the ANSYS Mesher and go back to Workbench windows. Under Forced Convection Refined Mesh, right click on Fluid Flow (FLUENT) and click Update. Wait for a few minutes for FLUENT to obtain a solution.

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