Numerical Simulation of Turbulent Offset Dense Jet Flow

Abstract

AbstractThe investigation of turbulence characteristics is of great importance in studying the behavior of turbulent offset jet flows given their complex and unique features, and can lead to the adoption of appropriate decisions in designing hydraulic structures. In this study, numerical simulations of experimental offset jet flows were implemented by using one of the most accurate Large Eddy Simulation (LES) turbulence models (i.e., the WALE model). To investigate the effect of turbulent offset jet flows on parameters such as Reynolds Stresses, the profiles of the turbulence characteristics were simulated. In this respect, the cross-sectional profiles of horizontal dense jet flows showed that jet flow concentrations were larger in the regions closer to the effluent, which resulted in plume transition to wall jet. The results indicated that Reynolds shear stresses in the lower shear layer were slightly greater than in the upper shear layer, which agreed well with the experimental results. In addition, the WALE model showed the best performance in the simulation of the Reynolds shear stresses so that the numerical results were in good general agreement with the experimental measurements. The present study indicates the levels of the turbulence model’s accuracy in the simulation of turbulent offset jet flows and can be reckoned as a reference for future studies in this scope.KeywordsDense jet flowOpenFOAMReynolds shear stressTurbulence characteristics