论文标题
可压缩流的阻力经过一系列球体
Drag force of a compressible flow past a random array of spheres
论文作者
论文摘要
我们对亚音速和跨音量流的粒子分辨模拟经过球形颗粒的随机阵列。 Reynolds编号以$ re {\ of左右} 300 $持有，以确保流动保留在连续体制中。在低体积分数下，由于减震波的形成，拖曳力在临界马赫数附近急剧增加，并在散装流量超音速时达到最大值。邻居引起的流体动力相互作用减少了较高体积分数下的临界马赫数。引入了有效的马赫数，以捕获压缩性对阻力的效果的增加。提出了一种新的阻力相关性，适用于从稀释到中等密度悬浮液的亚音速和弱超音速流。
We perform particle-resolved simulations of subsonic and transonic flows past random arrays of spherical particles. The Reynolds number is held at $Re{\approx}300$ to ensure the flow remains in the continuum regime. At low volume fractions, the drag force increases sharply near a critical Mach number due to the formation of shock waves and reaches a maximum value when the bulk flow is supersonic. Neighbour-induced hydrodynamic interactions reduce the critical Mach number at higher volume fractions. An effective Mach number is introduced to capture the increase in compressibility effects on drag. A new drag correlation is proposed valid for subsonic and weakly supersonic flow from dilute to moderately dense suspensions.
