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Double click on Mesh for Forced Convection Refined Mesh. A new The ANSYS Mesher window will open. Under Outline, expand mesh tree and click on Edge Sizing. Repeat the mesh steps, but this time use edge sizing of 50 and 0. 02.
Highlight "Edge Sizing". Under Details of "Edge Sizing", enter 60 for increase Number of Divisions. Under Bias select:
"--- --- - -" and when asked for the bias factor please enter 20.
Similarly, specify element size of 0.015m for Edge Sizing 2.
to 50. This will refine the mesh in the radial direction.
Highlight "Edge Sizing 2". Under Details of "Edge Sizing 2", decrease element size to be 0.02. This will refine the mesh in the axial direction.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. If you refer back to the mesh details and expand statistics, you will notice that the number of elements has increased to 1953615300, compared to 5508 of the original mesh. 
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 and update all the results.
We would want to compare the solution between on the two meshes. To do that, drag the Solution cell of Forced Convection Refined Mesh to Results cell of Forced Convection. 
Finally, double click on Results cell of Forced Convection to compare. Under Outline tab, click on the results of interest to analyze .
How do the results below compare to the experimental results. Keep in mind the assumptions and plotting points for the simulation compared to the experimental results. Just because some of the results seem further away does not necessarily mean the simulation is wrong.
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Centerline Pressure
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(pretty sweet, huh?).
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Centerline Temperature
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Wall Temperature
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What can you say about mesh refinement after comparing the results?
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