An assessment of turbulence models applied to the simulation of a two-dimensional submerged jet

This paper is concerned with the investigation of the performance of differ ent turbulence models in the numerical prediction of transient flow caused by a confined submerged jet, Several widely used models, i.e., the standard k-epsilon RNG k-epsilon, low Reynolds number k-epsilon models and the diff erential Reynolds stress model, as included in CFD codes, were compared wit h each other for a two-dimensional, incompressible, turbulent jet flow and with reported experimental data. A flapping oscillation was predicted regar dless of the model used. A chosen Strouhal (St) number definition brought t he fundamental frequencies from both the experiments and computations into close proximity. However, different turbulence models have exhibited quite different behaviours in terms of the frequency and regularity of the oscill ation and in terms of the scale and duration of the vortices generated. All versions of the k-epsilon model yielded regular oscillations. which agree with experimental observations. On the other hand, the Reynolds stress (RS) model produced a complex pattern but a slower dissipation of vortices. In addition, some aspects of gridding and inflow representation are also discu ssed. (C) 2001 Elsevier Science Inc. All rights reserved.