Assessment of Turbulence Models in Predicting the Mixing Characteristics of Circular Twin Jets

In this paper, a computational fluid dynamic investigation of twin circular orifice jets was conducted for an orifice-to-orifice distance of 3.75 mm and a Mach number of 0.8. The RANS-based turbulence models are evaluated based on examining the jet properties like streamwise velocity, rate of decay, jet half-width and rate of spread. The results show that the K-ω SST turbulence model was effective in predicting the mixing properties like potential core, decay rate, jet half-width and spread rate. Numerical data obtained from the Reynolds stress model and K-ε turbulence models agree well with experimental data in the core region of the jet. In contrast, the transition and self-similar regions are better predicted by the shear stress transport K–ω turbulence model. Overall, the K-ω SST turbulence model was close in agreement with the experimental measurements in the near field and far field of the jet flow field.