TY - JOUR
TI - Large-scaled simulation on the coherent vortex evolution of a jet in a cross-flow based on lattice Boltzmann method
AU - Shangguan Yanqin
AU - Wang Xian
AU - Li Yueming
JN - Thermal Science
PY - 2015
VL - 19
IS - 3
SP - 977
EP - 988
PT - Article
AB - Large eddy simulation (LES) is performed on a jet issued normally into a  cross-flow using lattice Boltzmann method (LBM) and multiple graphic  processing units (multi-GPUs) to study the flow characteristics of jets in  cross-flow (JICF). The simulation with 8 1.50´10 grids is fulfilled with 6  K20M GPUs. With large-scaled simulation, the secondary and tertiary vortices  are captured. The features of the secondary vortices and the tertiary  vortices reveal that they have a great impact on the mixing between jet flow  and cross-flow. The qualitative and quantitative results also indicate that  the evolution mechanism of vortices is not constant, but varies with  different situations. The hairpin vortex under attached jet regime originates  from the boundary layer vortex of cross-flow. While, the origin of hairpin  vortex in detached jet is the jet shear-layer vortex. The mean velocities  imply the good ability of LBM to simulate JICF and the large loss of jet  momentum in detached jet caused by the strong penetration. Besides, in our  computation, a high computational performance of 1083.5 MLUPS is achieved.