We study round turbulent jets with variable density using Direct numerical simulations (DNS) and Spectral element method (SEM) for spatial discretization. A fully developed turbulent air pipe flow at a Reynolds number Re = 5300 enters the volume filled with ambient gas (air, carbon dioxide or helium). The validation of DNS is performed using the data from the literature. We inspect the instantaneous velocity and concentration fields for all three cases with the emphasis on the typical vortical structures dominating the flow.
展开▼
机译：我们使用直接数值模拟（DNS）和光谱元件方法（SEM）来研究具有可变密度的圆形动荡的喷气机，用于空间离散化。 Reynolds Number Re = 5300处的完全发育的湍流空气管流量进入填充环境气体（空气，二氧化碳或氦气）的体积。使用来自文献中的数据执行DNS的验证。我们检查所有三种情况下的瞬时速度和浓度字段，重点是典型的涡旋结构主导流量。
展开▼
