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Five different two-equation turbulence models (standard k-ε, re-normalised group k-ε, realisable k-ε, standard k-ω and shear stress transport k-ω) that were available within the software package were used to model the free jet case and the sensitivity of the outputs produced from each was investigated by manipulating mesh density and domain size. The details of each turbulence model can be found in the Fluent User Manual (ANSYS 2009) and are therefore not presented here. Sensitivity towards far-field boundary conditions was investigated by running the simulation using the five cases in Table 4. For each case, the near-wall areas were resolved through the use of enhanced wall functions. This removed the requirement to fully resolve the flow in the near-wall region therefore reducing the mesh size significantly.

Table 4

Settings used for far-field boundary condition sensitivity testing

CaseInlet
turbulence intensity (%)
Far-field
turbulent Intensity (%)
Far-field
viscosity ratio
4.14 
4.14 
4.14 0.5 
4.14 10 
4.14 0.05 
CaseInlet
turbulence intensity (%)
Far-field
turbulent Intensity (%)
Far-field
viscosity ratio
4.14 
4.14 
4.14 0.5 
4.14 10 
4.14 0.05 

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