Spectral element method is used in this paper to establish the numerical model for calculating the transient fluid-structure interaction in underwater explosion. The fluid is assumed to be inviscid and irrotational, with the cavitation phenomenon being considered. The numerical model is validated with the classical flat plate in underwater shock problem and the numerical results coincide well with the analytic solution. The cavitation region is also plotted and analyzed and result shows that the cavitation effect is necessary to be considered in numerical simulation since it can influence the structural response severely. Based on the numerical model built in this paper, the interaction between the spring-plate and the fluid in underwater explosion is calculated by the spectral element method (SEM) and the finite element method (FEM) respectively with various mesh refinements. Through the comparison between SEM and FEM, it shows that SEM can save a lot of computing time and advance the precision as well. This paper aims to provide references to the fluid-structure interaction problems in underwater explosion.
GUO Jun;ZHANG A-man;YANG Wen-shan; LI Jia.
Research on the transient fluid-structure interaction with spectral element method[J]. Journal of Vibration and Shock, 2012, 31(2): 81-85
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