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基于不同算法和边界条件的土中爆炸数值计算 被引量:9

Numerical Simulation of Explosion in Soil under Various Arithmetic and Boundary Conditions
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摘要 运用共用节点算法、接触算法和任意拉格朗日-欧拉(ALE)算法对土中爆炸问题进行了数值模拟,考虑了3种不同的人工边界条件,即粘性边界、三维一致粘弹性边界和远置边界,从模型建立、模拟结果和计算时间3个方面对不同算法和边界条件下爆炸成腔效果进行了对比分析。结果表明:不同流固耦合算法各有优劣,需同时兼顾计算成本和模拟效果等因素选取合适的算法,而等效粘弹性边界单元可在保证计算精度的前提下有效降低计算成本,更好地模拟爆炸冲击过程中无限地基能量辐射阻尼效应问题。 The Lagrange algorithm, contact algorithm and Arbitrary Lagrange-Euler(ALE) algorithm were used to simulate explosion process with concentrated charge in soil. Considering different artificial boundary conditions, such as the viscous boundary,3D consistent viscous-spring boundary and far-field boundary,the formation and development law of explosion cavity and the explosion wave propagation law in soil were simulated. With the detailed example,different arithmetic and boundary conditions were analyzed by modeling, simulation results and computing cost. The results show that computational cost and simulation results should be taken into account for the choice of fluid-solid coupling arithmetic. Meanwhile, the equivalent viscous-spring boundary element effectively reduced the boundary effect with high solution precision and efficiency for simulation of blasting in soil.
出处 《爆破》 CSCD 北大核心 2014年第2期21-25,共5页 Blasting
基金 国家自然科学基金项目(No.51279095)
关键词 爆炸成腔 算法 边界条件 精度 explosion cavity arithmetic boundary condition precision
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