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地下拱形结构爆炸响应计算二维和三维模型比较 被引量:4
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作者 洪武 徐迎 +1 位作者 金丰年 范华林 《振动与冲击》 EI CSCD 北大核心 2014年第9期142-147,共6页
数值计算是研究地下拱形结构在爆炸荷载作用下动力响应问题的一种较好方法,数值计算过程中将三维(3D)模型简化为二维(2D)模型能提高数值计算效率,同时也会造成一定的计算误差。为了研究二维计算模型能否等效三维计算模型以及等效的前提... 数值计算是研究地下拱形结构在爆炸荷载作用下动力响应问题的一种较好方法,数值计算过程中将三维(3D)模型简化为二维(2D)模型能提高数值计算效率,同时也会造成一定的计算误差。为了研究二维计算模型能否等效三维计算模型以及等效的前提条件和范围,采用数值计算分别对3D模型和2D模型爆炸冲击作用下地下拱形结构动力响应进行比较分析。计算结果表明:在两种计算模型中,自由场压力峰值的计算结果在装药周围差异较大,随着装药距离的增加趋于吻合;在2D模型中拱形结构的约束条件被增强,导致2D模型计算得到的应力、应变和质点振动速度偏小;当比例爆距大于一定值时2D模型和3D模型的计算结果吻合较好,计算表明该临界值为临界比例距离为2.76 m/kg1/3。 展开更多
关键词 地下拱形结构 爆炸 二维数值模拟方法 数值模拟方法
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Two-dimensional Numerical Simulation of an Elastic Wedge Water Entry by a Coupled FDM-FEM Method
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作者 Kangping Liao Changhong Hu Wenyang Duan 《Journal of Marine Science and Application》 2013年第2期163-169,共7页
Hydroelastic behavior of an elastic wedge impacting on calm water surface was investigated. A partitioned approach by coupling finite difference method (FDM) and finite element method (FEM) was developed to analyz... Hydroelastic behavior of an elastic wedge impacting on calm water surface was investigated. A partitioned approach by coupling finite difference method (FDM) and finite element method (FEM) was developed to analyze the fluid structure interaction (FSI) problem. The FDM, in which the Constraint Interpolation Profile (CIP) method was applied, was used for solving the flow field in a fixed regular Cartesian grid system. Free surface was captured by the Tangent of Hyperbola for Interface Capturing with Slope Weighting (THINC/SW) scheme. The FEM was applied for calculating the structural deformation. A volume weighted method, which was based on the immersed boundary (IB) method, was adopted for coupling the FDM and the FEM together. An elastic wedge water entry problem was calculated by the coupled FDM-FEM method. Also a comparison between the current numerical results and the published results indicate that the coupled FDM-FEM method has reasonably good accuracy in predicting the impact force. 展开更多
关键词 elastic wedge water entry coupled FDM-FEM method volume weighted method CIP method THINC/SW scheme hydroelastic behavior
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