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首页> 外文期刊>Journal of Computational Physics >Investigation of underwater explosion near composite structures using a combined RKDG-FEM approach
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Investigation of underwater explosion near composite structures using a combined RKDG-FEM approach

机译：使用抗康格 - FEM方法研究复合结构附近水下爆炸的研究

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摘要

A combined RKDG-FEM approach, using the Runge-Kutta discontinuous Galerkin (RKDG) method [1,2] for fluid simulating and the finite element method (FEM) [3,4] for structure simulating, is developed to study the complex interactions between compressible multiphase flows and deformable steel and composite structures in near-field early-time underwater explosion (UNDEX). The level set method (LSM) [5,6] and the real ghost fluid method (RGFM) [7,8] are applied to capture and treat the moving gas-water interface, respectively. A GFM-based interface treating scheme [9,10] is adopted to treat the fluid-structure interface, achieving the coupling by solving simultaneously the fluid characteristic equation and the structure equation of motion at the material interface to satisfy the kinematic compatibility and pressure equilibrium conditions. The isentropic one-fluid cavitation model in [11] is employed to capture the transient flow cavitation. Accuracy and effectiveness of the combined RKDG-FEM approach are validated by five benchmark cases, and then it is applied to simulate early-time UNDEX problems near a submerged aluminum foam-cored sandwich plate and a monolithic steel plate of equivalent mass. Numerical results show that the sandwich plate has a higher underwater explosion load resistance through absorbing plastic energy by the foam core than the monolithic steel plate of equivalent mass, and that the foam core plays an important role in the fluid-structure interaction (FSI) and flow cavitation effects, which can be exploited to improve the UNDEX mitigation capability of composite sandwich structures. (C) 2019 Elsevier Inc. All rights reserved.
机译：使用跳动-Kutta不连续的Galerkin（RKDG）方法[1,2]用于流体模拟和用于结构模拟的有限元方法（FEM）[3,4]的组合的RKDG-FEM方法是为了研究复杂的相互作用在近场早期水下爆炸（UNDEX）中的可压缩式多相流和可变形钢和复合结构。水平集法（LSM）[5,6]和实际重影流体方法（RGFM）[7,8]分别用于捕获和处理移动的气体水接口。采用基于GFM的界面处理方案[9,10]来处理流体结构界面，通过同时求解流体特性方程和材料界面中运动的结构方程来实现耦合，以满足运动学兼容性和压力平衡状况。采用[11]中的常熵单流量空化模型来捕获瞬态流量空化。 COLLED RKDG-FEM方法的准确性和有效性由五个基准案例验证，然后应用于在浸没式铝泡沫芯夹层和单片钢板附近模拟早期撤销问题。数值结果表明，夹层板具有较高的水下爆炸载荷阻力，通过泡沫芯吸收塑料能量而不是相当质量的整体钢板，并且泡沫芯在流体结构相互作用（FSI）中起着重要作用流量空化效果，可以利用，以改善复合夹层结构的撤销减轻能力。 （c）2019 Elsevier Inc.保留所有权利。

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