Development of three-dimensional vortex method for gas-liquid two-phase flow around an obstacle and verification by experiment

绕障碍物气液两相流三维涡流法的建立及实验验证

基本信息

批准号：
14550145
负责人：
UCHIYAMA Tomomi
金额：
$ 1.79万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550145/
关键词：
gas-liquid two-phase flow vortex method bubbly flow flow around obstacle vortical structure void fraction vortex in cell method jet 流れの可視化 Vortex in cell

项目摘要

1.Development of three-dimensional vortex method for free turbulent flowA three-dimensional vortex method for single-phase jet is developed. A compound jet issuing from a round nozzle into the stream co-flowing in the same direction is simulated. The flow in the nozzle is solved by a panel method. The vortex elements are released from the nozzle edge, and the behavior is simulated by the Lagrangian approach. A blob model is employed for the vortex element. The distribution function for the vorticity in each vortex element and the axial length of the computational domain are found to affect the numerical results.2.Development of three-dimensional vortex method for jet entrained with bubbleThe three-dimensional vortex method is applied to simulate the jet loaded with small bubbles. The simulation examined the effect of the disturbance at the nozzle exit.3.Measurement of static pressure on an obstacle installed in vertically upward bubbly flowThe static pressures on an obstacle installed in vertically upward bubbly flow are measured.4.Development of vortex method for bubble-laden free turbulent flowA vortex method for bubbly flow is developed. The method can consider the interaction between the two phases. In the method, the liquid vorticity field is discretized into the vortex elements. The behavior of the vortex element and the motion of the bubble are calculated by the Lagrangian method. The change of the vorticity due to the bubble is estimated by the vortex in cell method. The validity of the method is confirmed by applying the simulation of a plane mixing layer loaded with air bubbles.

1.自由湍流三维涡流法的发展建立了单相射流三维涡流法。模拟从圆形喷嘴发出的复合射流，进入沿同一方向共同流动的流中。喷嘴内的流动采用面板法求解。涡流单元从喷嘴边缘释放，并通过拉格朗日方法模拟其行为。涡流单元采用斑点模型。发现各涡单元涡量的分布函数和计算域的轴向长度对数值结果有影响。2.夹带气泡射流三维涡方法的发展应用三维涡方法来模拟充满小气泡的喷射流。模拟检验了喷嘴出口处扰动的影响。3.垂直向上气泡流中安装的障碍物静压力的测量测量垂直向上气泡流中安装的障碍物的静压力。4.气泡涡流法的发展-负载自由湍流开发了一种用于气泡流的涡流方法。该方法可以考虑两相之间的相互作用。在该方法中，液体涡量场被离散化为涡元。涡流单元的行为和气泡的运动通过拉格朗日方法计算。由气泡引起的涡度变化是通过涡胞法来估计的。通过对含有气泡的平面混合层的模拟验证了该方法的有效性。