Fundamental two-phase flow modeling efforts at CSAR

This paper gives an overview of the two-phase flow research at CSAR, giving detailed reports on two of the ongoing efforts. The first of these efforts is the development of a force law applicable to particles experiencing conditions typical of rocket flows. Standard force laws make one of these two assumptions: (a) that the particle diameter is much smaller than the smallest fluid length scale; or (b) that the particle-based Reynolds number is much less than 1. A force-law that makes neither assumption is necessary for large aluminum droplets in a solid rocket motor (SRM) to be tracked accurately. The small particles of aluminum oxide ash in an SRM are too numerous to be tracked at all. The second effort described here is the development of a new continuum model called the fast Eulerian method which is more efficient than the traditional Eulerian method at evolving particle concentration fields, while retaining the important physics associated with the preferential accumulation of particles.