摘要
本文对流动雷诺数 Re=5990的空间发展的气固两相湍流射流进行了直接数值模拟。其中对流场的求解采用具有四阶精度的紧致差分格式,对颗粒场的跟踪采用拉格朗日方法。结果表明,湍流拟序结构逐渐由对称模式发展到非对称模式;较小 Stokes 数的颗粒在流场中均匀分布,较大 Stokes 数的颗粒沿横向没有明显的扩散,而 Stokes 数为 1的量级的颗粒则大量聚集在大涡结构的外围。
A spatial developing gas-solid two-phase turbulent jet with Reynolds number 5990 is studied
by direct numerical simulation. The fourth order compact finite difference schemes are adopted to
discretize the space derivatives in solving the flow field, and the Lagrange method is used to trace
particles. The results show that the turbulent coherent structures evolve gradually from the symmetry
mode to the asymmetry mode. Particles with the smaller Stokes number distribute evenly in the
flow field. Particles with the larger Stokes number have no apparent lateral dispersion. But the
particles with Stokes number of the order of 1 concenirate largely on the outer of the large-scale vortex
structures.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2004年第3期431-434,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50236030)
关键词
直接数值模拟
拟序结构
颗粒扩散
direct numerical simulation
coherent structures
particle dispersion
