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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. They used unstructured mesh, I used structured mesh.
Good thing to note:
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When setting boundary conditions of the inlet and outlet, they use
Turbulence Specification Method: Intensity and Hydraulic Diameter. (Turbulence intensity, hydraulic diameter)
Use pressure outlet for the outlet boundary condition.
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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.
Remember to use 3ddp when open fluent for the previous file.