In this study, the mathematical models suitable for natural circulation, parallel channels, and general forms of additional force under moving conditions were established. An analysis code was developed using SIMPLE algorithm. Based on the validated code, the natural circulation and parallel flow instability under typical moving conditions such as inclination, rolling, heaving, and coupled motion were discussed, and the corresponding flow instability boundaries were obtained. The results show that under the moving conditions, the natural circulation flow change is manifested as the superposition of the two-phase instability fluctuation and the motion-induced fluctuation. The heaving condition has the most drastic effect on flow rate with fluctuation amplitude exceeding 30%, but the average flow rate remains unchanged. The boundary of natural circulation flow instability will be slightly extended affected by motions and the variation of the boundary quality is less than 0.03. The inclination and rolling tend to destabilize the parallel channels system and reduce the boundary quality by more than 0.1, whereas the effect of heaving on the parallel instability is not significant. For the parallel flow instability, the adverse effect is mainly attributed to the decrease of the mean flow rate at the entrance of the parallel channels caused by the motions, while the flow re-distribution between parallel channels and natural circulation flow fluctuation induced by the moving conditions do not contribute much.

在这项研究中，建立了适用于自然环流，平行通道和运动条件下附加力的一般形式的数学模型。使用SIMPLE算法开发了一个分析代码。根据验证码，讨论了典型运动条件下的自然循环和平行流失稳，例如倾斜，滚动，起伏和耦合运动，并获得了相应的流失边界。结果表明，在运动条件下，自然循环流量变化表现为两相失稳波动与运动引起的波动的叠加。涨落条件对流量的影响最大，波动幅度超过30％，但平均流量保持不变。自然循环流动不稳定性的边界将受到运动的影响而略微扩展，边界质量的变化小于0.03。倾斜和滚动倾向于使平行通道系统不稳定，并使边界质量降低超过0.1，而隆起对平行不稳定性的影响并不明显。对于平行流失稳，不利影响主要归因于运动引起的平行通道入口平均流速的降低，而平行通道之间的流量重新分布以及运动引起的自然循环流量波动。条件贡献不大。倾斜和滚动倾向于使平行通道系统不稳定，并使边界质量降低超过0.1，而隆起对平行不稳定性的影响并不明显。对于平行流失稳，不利影响主要归因于运动引起的平行通道入口平均流速的降低，而平行通道之间的流量重新分布以及运动引起的自然循环流量波动。条件贡献不大。倾斜和滚动倾向于使平行通道系统不稳定，并使边界质量降低超过0.1，而隆起对平行不稳定性的影响并不明显。对于平行流失稳，不利影响主要归因于运动引起的平行通道入口平均流速的降低，而平行通道之间的流量重新分布以及运动引起的自然循环流量波动。条件贡献不大。