CAJ | 학술논문

采用多物质ALE（Arbitrary Lagrangian-Eulerian）仿真方法，对球体入水时引发的水花、空泡及其所受冲击力等内容进行了系统的研究。首先，将通过仿真得到的水花和空泡的发展过程与实验、理论数据的对比，证明多物质ALE方法不但可以再现结构入水的复杂过程，还能较好地反映密度，冲击速度及表面亲水性等因素的影响；进而，计算了分析了小球入水时所受冲击力系数的变化规律；最后，研究了并行计算对提高大规模流-固耦合问题计算效率的效果。结果表明：多物质ALE流-固耦合方法是仿真结构入水过程的有效手段，而优化后并行计算技术则可大大提高复杂结构入水时的仿真计算效率。
채용다물질ALE（Arbitrary Lagrangian-Eulerian）방진방법，대구체입수시인발적수화、공포급기소수충격력등내용진행료계통적연구。수선，장통과방진득도적수화화공포적발전과정여실험、이론수거적대비，증명다물질ALE방법불단가이재현결구입수적복잡과정，환능교호지반영밀도，충격속도급표면친수성등인소적영향；진이，계산료분석료소구입수시소수충격력계수적변화규률；최후，연구료병행계산대제고대규모류-고우합문제계산효솔적효과。결과표명：다물질ALE류-고우합방법시방진결구입수과정적유효수단，이우화후병행계산기술칙가대대제고복잡결구입수시적방진계산효솔。
The water splash, bubble triggered by sphere impact onto the water, and the impact coefficient of water entry were systematically studied based on ALE (Arbitrary Lagrangian-Eulerian) multi-material method. The ALE multi-material method’s capability to reproduce the complex process of water enter, and the abilities to reflect the density, impact velocity and surface hydrophilic and other factors ’ influences on the splash and bubble, were proved by means of comparing the simulation results and the experimental, the-oretical data, and the impact coefficients were analyzed through simulation. Finally, the computational effi-ciency of parallel computing to solve large-scale fluid-structure interaction problem was discussed. The results show that the fluid-structure interaction simulation method based on ALE multi-material formula-tion is an effective way to simulate water entry process, and the optimized parallel computing technology can greatly improve simulation efficiency of solving large-scale complex water entry analysis model.