报告题目：Implosion of the Argentinian Submarine ARA San Juan S-42
Undersea: Study and Simulation
报 告 人：陈鞏，托克萨斯农工大学教授，JMAA主编
This talk addresses a contemporary event of the sunken Argentinian submarine ARA San Juan S-42 in November 2017. The submarine’s wreckage was found one year later on the seabed off the southern Atlantic coast of Argentina, with its imploded debris scattered on the seabed at the depth of about 900 meters under sea level. But what is implosion? First, we introduce several phenomena of implosions. Then we develop computational mechanics modeling and conduct supercomputer simulations for this study, using the versatile software LS-DYNA as the platform. We first revisit underwater implosion phenomena by the test of pressurizing a plugged aluminum cylinder in a water tank and match the patterns of structural deformations as the important way to validate our computational methodology and model selections. Furthermore,the radiation of the implosion shocks are computed and compared with those in the literature.
Using a base model for the submarine, we are able to perform event
reconstruction for the underwater implosion of ARA San Juan S-42. Our work can encompass the features of structural fracture and break-up, which were not included in the earlier studies. Furthermore, we show that by adding ring stiffeners (“buckle arrestors”), we can delay the onset of underwater implosion by increasing the tolerance of more water depth for the submarine.
All the dynamic nonlinear implosion phenomena can be visualized by video animations obtained from our supercomputer simulations, which are also compared with an artistically rendered video animation.
陈鞏教授任职于托克萨斯农工大学，是数学系和航天工程学院的教授，也是法国巴黎信息与自动化国立研究所，加拿大蒙特利尔大学数学研究中心，丹麦科技大学，新加坡国立大学和台湾大学及新竹国立清华大学的客座教授。陈鞏教授在应用数学和计算数学的许多领域都有很深的造诣。撰写论文一百三十多篇，出版七本专著。他是国际知名数学杂志Journal of Mathematical Analysis and Applications的主编，并曾担任查普曼霍尔出版社出版的应用数学和非线性科学系列丛书主编。此外，他还拥有一个关于某些量子计算及量子电路设计的美国专利。