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Implosion of the Argentinian Submarine ARA San Juan S-42 Undersea: Study and Simulation

作者:   時間:2019-10-21   點擊數:

報告題目:Implosion of the Argentinian Submarine ARA San Juan S-42 Undersea: Study and Simulation

報告人:Professor Goong Chen(陳鞏),Texas A&M University

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.

The talk is easy to understand, without specialized prerequisite. Everyone is welcome.

時間:20191022日上午10:00-11:00

地點:知新樓B924報告廳

簡介:

Goong Chen1972年在臺灣清華大學獲學士學位(數學),1977年獲University of Wisconsin at Madison博士學位。自1987年至今,一直在美國Texas A&M Univerity數學與航空工程學院任教,現為該校終身教授。2000年成為Texas A&M Univerity量子研究所成員。

Goong Chen教授在應用和計算數學的諸多領域有研究興趣:偏微分方程的控制理論,邊界元方法和偏微分方程數值解,工程力學,混沌動力學,量子計算,化學物理和量子力學。在SIAM ReviewSIAM Journal on Control and Optimization等刊物上發表了150多篇論文,已出版7本英文專著,編輯4本英文學術著作。他目前是SCI期刊Journal of Mathematical Analysis and Applications的主編,以及Elsevier/Academic出版社科學與工程數學叢書的主編。他曾擔任過Chapman & Hall/CRC出版社應用數學與非線性科學叢書的主編(2002-2011)。他還是其它幾個期刊的副主編,包括SIAM Journal on Control and Optimization,the International Journal on Quantum Information, Physica Scripta,以及the Electronic Journal of Differential Equations。他還是美國數學學會(AMS)和工業和應用數學學會(SIAM)的會員。

Goong Chen教授目前正在從事與計算力學有關的項目研究。他的關于失蹤馬航MH370航班的文章,作為封面故事,發表在20154Notices of The American Mathematical Society (AMS),被美國數學學會稱為“Top Math Stories in the Media -2015”

邀請人:張曉燕教授

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