Comparison of Turbulence Models in Case of Jet in Crossflow Using Commercial CFD Code

Abstract

This chapter compares turbulence models in case of jet in cross-flow using commercial computational fluid dynamics (CFD) code. A circular jet in a cross-flow is simulated numerically using a commercial CFD code. A grid resolution study is performed to find a grid that yields a grid-independent solution. The three high-Reynolds-number k–ɛ models, the two k-ω models, the six low-Reynolds-number k–ɛ models as well as the Reynolds stress model are used. In all calculations, the near-wall regions are resolved all the way down to the wall and no wall functions are used. Jet to cross-flow velocity ratio is 3.3. The Reynolds numbers of the cross-flow and the jet are 317,000 and 8,130, respectively. Results show that a grid is fine to obtain a grid-independent solution. There are considerable differences between the turbulence models. Results of standard k–ɛ model are closest to the measured values. Results of the SST k–ω model are also quite satisfactory. The RNG k–ɛ model and the standard k- ω model gave nonphysical velocity profiles.