LS-PrePost是一款功能强大、操作便捷的爆炸仿真软件。*INITIAL_VOLUME_FRACTION_GEOMETRY和*LOAD_BLAST是LS-PrePost中的关键字卡片,而SPH是一种光滑粒子流体动力学方法,都可以用来施加爆炸载荷。为研究球形装药爆炸仿真建模方法,使用...LS-PrePost是一款功能强大、操作便捷的爆炸仿真软件。*INITIAL_VOLUME_FRACTION_GEOMETRY和*LOAD_BLAST是LS-PrePost中的关键字卡片,而SPH是一种光滑粒子流体动力学方法,都可以用来施加爆炸载荷。为研究球形装药爆炸仿真建模方法,使用以上方法进行建模,分析不同建模方法的优缺点及适用场景。选择最优建模方法研究1 kg TNT炸药不同形状装药爆炸产生空气冲击波的不同。本文在研究爆炸仿真建模现状的基础上,查阅文献资料,选择最优建模方法。在经过验证的有限元模型上进行爆炸仿真,模拟实验仅改变装药形状参数,对球形、柱形、方形装药的有限元爆炸模型进行求解,得到不同比例距离下的超压峰值,制作图表比较各组超压峰值数据的差异。结果表明,在比例距离小于等于1.0 m·kg^(-1/3)时,柱形装药的超压峰值与球形装药更接近,而方形装药超压峰值与球形装药差异更大;随着比例距离的增加,柱形装药的峰值超压与球形装药的比值变化不大,而方形装药的峰值超压与球形装药的比值逐渐增加,变化较大。不同装药形状对于爆炸产生的冲击波超压的影响是不容忽视的,在研究实际爆炸案件的装药及其爆炸破坏作用时,应尽可能采用最接近实际情况的装药形状。在通过爆炸仿真方法研究问题时,也要选择合适的建模方法和装药条件,才能保证分析结果的准确可靠。展开更多
运用 Auto Rea Gas爆炸仿真模拟器研究了独头巷道中点火位置对瓦斯爆炸后果的影响。结果表明 ,在本文计算条件下 ,爆炸静态超压随着距离的增加而减小 ,爆炸动压随着距离的增大而增大。点火位置对爆炸后果有重要影响 ,点火位置离封闭端越...运用 Auto Rea Gas爆炸仿真模拟器研究了独头巷道中点火位置对瓦斯爆炸后果的影响。结果表明 ,在本文计算条件下 ,爆炸静态超压随着距离的增加而减小 ,爆炸动压随着距离的增大而增大。点火位置对爆炸后果有重要影响 ,点火位置离封闭端越近 。展开更多
Based on the new progenitor stars model, the influence of ion screening is investigated. The simulation results show that ion screening has weak perturbation effects to the leptons in type-II supernova explosion. Ion ...Based on the new progenitor stars model, the influence of ion screening is investigated. The simulation results show that ion screening has weak perturbation effects to the leptons in type-II supernova explosion. Ion screening decreases slightly the fraction of leptons and prolongs slightly the shock propagation time. Moreover, simulation results are shown that ion screening increases the total energy loss and reduces the shock energy, eventually decreasing of explosion energy and becomes a negative factor to supernova explosion. In addition, comparison of slight perturbated variation of ion screening to leptons, but simulation results＂ show that ion screening affects obviously explosion energy of type-II supernova, hence, it can also confirm that the variation of leptons is very sensitive to energy in supernova explosion.展开更多
文摘LS-PrePost是一款功能强大、操作便捷的爆炸仿真软件。*INITIAL_VOLUME_FRACTION_GEOMETRY和*LOAD_BLAST是LS-PrePost中的关键字卡片,而SPH是一种光滑粒子流体动力学方法,都可以用来施加爆炸载荷。为研究球形装药爆炸仿真建模方法,使用以上方法进行建模,分析不同建模方法的优缺点及适用场景。选择最优建模方法研究1 kg TNT炸药不同形状装药爆炸产生空气冲击波的不同。本文在研究爆炸仿真建模现状的基础上,查阅文献资料,选择最优建模方法。在经过验证的有限元模型上进行爆炸仿真,模拟实验仅改变装药形状参数,对球形、柱形、方形装药的有限元爆炸模型进行求解,得到不同比例距离下的超压峰值,制作图表比较各组超压峰值数据的差异。结果表明,在比例距离小于等于1.0 m·kg^(-1/3)时,柱形装药的超压峰值与球形装药更接近,而方形装药超压峰值与球形装药差异更大;随着比例距离的增加,柱形装药的峰值超压与球形装药的比值变化不大,而方形装药的峰值超压与球形装药的比值逐渐增加,变化较大。不同装药形状对于爆炸产生的冲击波超压的影响是不容忽视的,在研究实际爆炸案件的装药及其爆炸破坏作用时,应尽可能采用最接近实际情况的装药形状。在通过爆炸仿真方法研究问题时,也要选择合适的建模方法和装药条件,才能保证分析结果的准确可靠。
文摘Based on the new progenitor stars model, the influence of ion screening is investigated. The simulation results show that ion screening has weak perturbation effects to the leptons in type-II supernova explosion. Ion screening decreases slightly the fraction of leptons and prolongs slightly the shock propagation time. Moreover, simulation results are shown that ion screening increases the total energy loss and reduces the shock energy, eventually decreasing of explosion energy and becomes a negative factor to supernova explosion. In addition, comparison of slight perturbated variation of ion screening to leptons, but simulation results＂ show that ion screening affects obviously explosion energy of type-II supernova, hence, it can also confirm that the variation of leptons is very sensitive to energy in supernova explosion.
