Applicability of numerical simulation to gas entrainment phenomena

Ito, Kei; Sakai, Takaaki; Ohshima, Hiroyuki; Tanaka, Nobuatsu*

Gas entrainment (GE) phenomena in a basic unsteady GE experiments were numerically surveyed to make clear an applicability of numerical simulations to a GE evaluation. To establish realistic evaluation methods, the numerical simulations were conducted on rather coarse mesh partition to reduce computational costs and the GE behaviors were evaluated by GE related parameters. As the results, it was confirmed that the numerical methods could reproduce the velocity fluctuation data and the GE related parameters even with the coarse mesh partition. In addition, the sensitivities of a turbulent modeling and a mesh partition on the simulation accuracy were discussed. These two factors could not lead significant improvements of the GE related parameters for the GE evaluation in this study. These results showed that the proposed numerical methods were appropriate to evaluate the GE phenomena.