Modified k-.EPSILON. model for turbulent swirling flow in a straight pipe.

Turbulence models applicable to turbulent swirling flow in a straight pipe have been developed. Two models, the standard k-ε model with higher order terms in Reynolds stress equation are applied, and a modified k-ε model with an anisotropic representation of turbulence is proposed. The comparisons between the computed flow distributions and the experimental data show that the modified k-ε model predicts complex flow fields successfully. The magnitudes of the viscosity tensor components in the modified k-ε model are discussed in detail.