Direct Numerical Simulations of Multi-Phase Flows

在连续相和分散相的界面处，采用前沿跟踪技术研究由有限雷诺数的气泡或液滴组成的系统的直接数值流动模拟方法。通过计算机代码并行化，可以有效地描述复杂的多体碰撞和可变形界面。几个案例研究将检查由于重力、压力梯度和/或剪切流而在矩形域中自由移动的许多气泡和液滴的行为。结果将包括升力和阻力作为孔隙、分数、雷诺数和变形的函数，以及平均动量、通量、雷诺数应力和粒子弥散。改进的仿真能力与各种多相工程和环境过程相关。＊＊＊

ABSTRACT CTS-9503208 An approach for the direct numerical flow simulation of systems consisting of several bubbles or drops at finite Reynolds numbers will be investigated using a front tracking technique at the interface between the continuous and dispersed phase. Complex multi-body collisions and deformable interfaces can effectively be described in simulations by parallelizing the computer code. Several case studies will examine the behavior of many bubbles and drops moving freely in a rectangular domain due to gravity, pressure gradient, and/or shear flow. The results will include lift and drag force as a function of the void, fraction, Reynolds number, and deformations, and averaged momentum, flux, Reynolds stresses, and particle dispersion. The improved simulation capabilities have relevance to various multiphase engineering and environmental processes. ***