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Mesh 5 is the good one! The velocity vector compares ok with the data. The difference might be due to our mesh not refine enough causes truncation error.

2/15
Tutorial of flow over mixing elbow.
Used own mesh. Use the tutorial method. Obtained the solution (with back flow warning). Result not quite the same. Maybe due to different mesh.

Good thing to note:
When setting boundary conditions of the inlet and outlet, they use
Turbulence Specification Method: Intensity and Hydraulic Diameter. (Turbulence intensity, hydraulic diameter)

Create a mesh with more elements. Following the same steps, still not quite the same as the tutorial solution.

Ok, after this, I will try using hydraulic diameter to our pipe bend problem and see whether the result changes.