Assessment of simulating underwater impact using the ICFD solver in LS-DYNA

Gao, Xiaoli (2016) Assessment of simulating underwater impact using the ICFD solver in LS-DYNA. Masters thesis, Memorial University of Newfoundland.

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Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.

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This thesis demonstrates that although the ICFD solver of LS-DYNA is a practical tool that can precisely model fluid and structure interaction, it is not effective for simulating the underwater impact of two objects. A numerical model was developed using the ICFD solver to simulate the submerged impact of a structure and ice at model scale. The numerical results were compared with physical experiments conducted in the laboratory. This thesis reveals that a water mesh exists between the structure and the ice model on contact, which leads to the incorrect calculation of pressure at the ice-structure contact points and causes incorrect impact force. This thesis also proposes a method to verify that the peak impact force of two objects in the water equals the peak impact force of the same objects in air with equivalent artificial added mass and velocity.

Item Type: Thesis (Masters)
Item ID: 12443
Additional Information: Includes bibliographical references (pages 99-101).
Keywords: ICFD, LS-DYNA, Underwater impact, Ice
Department(s): Engineering and Applied Science, Faculty of
Date: October 2016
Date Type: Submission
Library of Congress Subject Heading: Computational fluid dynamics; Finite element method; Fluid-structure interaction--Mathematical models

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