Two dimensional spatial developing turbulent planar jets with different velocity ratios of jet fluid to co flow fluid at the inlet section are simulated with large eddy simulation give detailed information of transient behaviors of coherent structures in turbulent jets and depict how the velocity ratios will affect the evolution of coherent structures. The motion of small scale structures is described by the standard Smagorinsky SGS model. Transport equation of passive scalar is also solved in order to perform numerical visualization of flow field. Transient distributions of velocity are obtained at different evolution periods of turbulent jets. Evolutions of coherent structures in flow field are also given in this paper as well as the comparison of flow patterns among three different velocity ratios.
K. S. Lau 1) Yi Liu 1,2) Yin Cheng Guo 2) C. K. Chan 3) Wen Yi Lin 2) 1) Department of Applied Physics, The Polytechnic University, Hong Kong, China 2) Department of Engineering Mechanics, Tsinghua University, Be
