報告題目：Implosion of the Argentinian Submarine ARA San Juan S-42
Undersea: Study and Simulation
報 告 人：陳鞏，托克薩斯農工大學教授，JMAA主編
報告時間：2019年12月12日 14:00-15:00
報告地點：數學樓一樓第二報告廳
報告摘要：
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.
報告人簡介：
陳鞏教授任職于托克薩斯農工大學，是數學系和航天工程學院的教授，也是法國巴黎信息與自動化國立研究所，加拿大蒙特利爾大學數學研究中心，丹麥科技大學，新加坡國立大學和台灣大學及新竹國立清華大學的客座教授。陳鞏教授在應用數學和計算數學的許多領域都有很深的造詣。撰寫論文一百三十多篇，出版七本專著。他是國際知名數學雜志Journal of Mathematical Analysis and Applications的主編，并曾擔任查普曼霍爾出版社出版的應用數學和非線性科學系列叢書主編。此外，他還擁有一個關于某些量子計算及量子電路設計的美國專利。
