| 张社荣,李宏璧,王高辉,孔源.空中和水下爆炸冲击波数值模拟的网格尺寸效应对比分析[J].水利学报,2015,46(3): |
| 空中和水下爆炸冲击波数值模拟的网格尺寸效应对比分析 |
| Comparative analysis of mesh size effects on numerical simulation of shock wave in air blast and underwater explosion |
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| 中文关键词: 网格尺寸效应 空中爆炸 水下爆炸 爆炸冲击波 炸药当量 比例爆炸距离 |
| 英文关键词: mesh size effect air blast underwater explosion blasting shock wave charge weight scaled distance |
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| 中文摘要: |
| 爆炸冲击波在不同物理属性介质中的传播特性存在较大差别，使得其对数值模拟网格尺寸的依赖性也不尽相同。采用Euler算法建立了不同当量、不同网格尺寸下自由场空中和水下爆炸的全耦合数值模型，通过数值解与经验公式计算值对比，对空中和水下不同比例爆炸距离处爆炸冲击波数值模拟的网格尺寸效应及计算精度进行了对比研究。结果表明对于空中爆炸，比例爆炸距离较大处冲击波峰值超压的数值计算误差较小，而水下爆炸基本上与此相反；空中爆炸冲击波峰值的数值计算误差曲线以比例爆炸距离0.7 m/kg1/3 为界，具有明显的“前陡后缓”特征，而水下爆炸的误差曲线整体上较为平缓。此外，文中提出可采用“炸药半径与网格尺寸之比”确定网格尺寸，通过具体算例证明了该方法对不同当量的空中爆炸和水下爆炸问题均具有较强的适用性。 |
| 英文摘要: |
| There exists significant contrast in wave propagation phenomena in medium of different physical properties，which results in a difference of its reliance on mesh size in numerical simulation. With the Euler method， fully coupled simulation models for free-field explosions in air and water of different charge weights by variable mesh size were established. Through the comparison of numerical results and empirical formula， the mesh size effect of shock wave peak pressure at different scaled distances were analyzed and compared. The results show that as for air blasting， the calculation error of shock wave peak overpressure decreases with the increasing of scaled distance， which is opposite in underwater explosion. The numerical calculation error curve of air blast shock wave peak overpressures has an obvious difference before and after scaled distance 0.7 m/kg1/3，the curve is steep before and becomes very flat later，and the curve of underwater explosion is rather flat on the whole. In addition， the dimensionless parameter，“explosive radius and the mesh size ratio”was adopted as a criterion for determining mesh size in this paper. The results of examples have proved that the method is suitable for both air blast and underwater explosion. |
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