Modified Numerical Model for Simulating Fluid-Filled Structure Response to Underwater Explosion with Cavitation

doi:10.1007/s12204-014-1508-4

Abstract

Abstract: In this paper, a numerical method is established to analyze the response of fluid-filled structure to underwater explosion with cavitation and the validation of the method is illustrated. In the present implementation, the second-order doubly asymptotic approximation (DAA2) other than curved wave approximation (CWA) is used to simulate non-reflecting boundary. Based on the method, the difference between DAA2 non-reflecting boundary and CWA non-reflecting boundary is investigated; then, the influence of internal fluid volume and the influence of cavitation on dynamic response of spherical shell are analyzed. Compared with CWA non-reflecting boundary, DAA2 non-reflecting boundary treats added mass effects better. When the internal fluid is full, the displacement and velocity of spherical shell decrease, but, when the internal fluid is half, the displacement and velocity of spherical shell increase. The effect of cavitation is more obvious at the trailing point than at the leading point of spherical shell.

Key words: spectral element| finite element| doubly asymptotic approximation (DAA)| fluid structure interaction|fluid filled structure

摘要： In this paper, a numerical method is established to analyze the response of fluid-filled structure to underwater explosion with cavitation and the validation of the method is illustrated. In the present implementation, the second-order doubly asymptotic approximation (DAA2) other than curved wave approximation (CWA) is used to simulate non-reflecting boundary. Based on the method, the difference between DAA2 non-reflecting boundary and CWA non-reflecting boundary is investigated; then, the influence of internal fluid volume and the influence of cavitation on dynamic response of spherical shell are analyzed. Compared with CWA non-reflecting boundary, DAA2 non-reflecting boundary treats added mass effects better. When the internal fluid is full, the displacement and velocity of spherical shell decrease, but, when the internal fluid is half, the displacement and velocity of spherical shell increase. The effect of cavitation is more obvious at the trailing point than at the leading point of spherical shell.

关键词: spectral element| finite element| doubly asymptotic approximation (DAA)| fluid structure interaction|fluid filled structure

CLC Number:

U 661
O 383

XIAO Wei1 (肖巍), ZHANG A-man1* (张阿漫), WANG Yu2 (汪玉). Modified Numerical Model for Simulating Fluid-Filled Structure Response to Underwater Explosion with Cavitation[J]. Journal of shanghai Jiaotong University (Science), 2014, 19(3): 346-353.

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