Numerical investigation of interface dynamics and momentum exchanges between air and water flows

本研究的主要内容是气-水边界现象的研究和预报这些机理的数值模式的发展。在这个项目中，我们引入了一种新的处理两相流动的数学模型，以再现空气-水界面中动量传递的小尺度波动。并利用并行计算系统进行了高速、高精度的数值模拟。1)开发了基于分段方法的并行计算系统，成功地识别了非压缩流体的加速。2)将非结构网格应用到该模型中，实现了自由边界的计算。3)将新发展的数学建模和并行计算技术应用于气-水多相流中的湍流模拟。通过与实测值的比较，发现本文的数值模拟方法对明渠气流诱导的复杂多相流有较好的模拟精度。

The main topics of this study are the investigation of air-water boundary phenomena and development of numerical model which can predict these mechanism. In this project, we introduced the new mathematical model which deals with two-phase flows in order to reproduce the small-scale wave motions of momentum transfer in the air-water interface. Furthermore, the high-speed and highly-accurate numerical simulation was conducted by using parallel computing system. These results are follows as ;1)The parallel computation system was developped based on the segmentation method, and we recognized successfully the speed-up of the uncompressive fluid.2)The non-structured meshes were applied in to the present model and we could computed the free-boundaries.3)The newly-developped mathmatical modeling and parallel computing technique were applied to the turbulence simulation In the air-water multi-phase flows. By comparison with the measured results, we found the present simulation has a good accuracy In complex multi-phase flows such as air Induced open-channel flows.