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The following table demonstrates how the results change with a greater number of cells. It is quite clear that the mesh created in the tutorial (which has around 350,000 cells) is not fine enough to obtain a sufficiently accurate solution. 

These results were obtained with the following mesh settings: 

Convergence of the numerical solution is represented by a negligible change in power coefficient from an approximately four-fold increase in number of elements in the mesh. The mesh was refined by adjusting local mesh controls: relevance center, face sizing, inflation and sphere of influence. To obtain a mesh of 7.7 million elements (right-most data point in the plot), the relevance center was set to fine; the face size was set to 0.05m; for inflation, the number of layers was increased to 10 at a growth rate of 1.2; for the sphere of influence, the radius was set to 50m and element size was set to 1m.

Check that domain is adequately large

Compare blade tip velocities

The blade tip velocity was found to be 98.05 m/s in CFD-Post. This is basically identical to result obtain from hand-calculations which was 98.10 m/s. Great!

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