为探讨RD X基高聚物黏结炸药在小尺寸下爆轰产物的状态方程,采用两种直径(Φ10 m m和Φ25 m m)的圆筒试验研究了RD X基高聚物黏结炸药的做功能力,获得了圆筒壁膨胀位移、速度与时间的关系;利用非线性有限元动力学程序A n sy s/L s-D yn...为探讨RD X基高聚物黏结炸药在小尺寸下爆轰产物的状态方程,采用两种直径(Φ10 m m和Φ25 m m)的圆筒试验研究了RD X基高聚物黏结炸药的做功能力,获得了圆筒壁膨胀位移、速度与时间的关系;利用非线性有限元动力学程序A n sy s/L s-D yn a,对炸药的圆筒实验进行了数值模拟;通过与实验结果相比较,得到了RD X基高聚物黏结炸药爆轰产物JW L状态方程参数。展开更多
Conservative numerical methods are often used for simulations of fluid flows involving shocks and other jumps with the understanding that conservation guarantees reasonable treatment near discontinuities.This is true ...Conservative numerical methods are often used for simulations of fluid flows involving shocks and other jumps with the understanding that conservation guarantees reasonable treatment near discontinuities.This is true in that convergent conservative approximations converge to weak solutions and thus have the correct shock locations.However,correct shock location results from any discretization whose violation of conservation approaches zero as the mesh is refined.Here we investigate the case of the Euler equations for a single gas using the Jones-Wilkins-Lee(JWL)equation of state.We show that a quasi-conservative method can lead to physically realistic solutions which are devoid of spurious pressure oscillations.Furthermore,we demonstrate that under certain conditions,a quasi-conservative method can exhibit higher rates of convergence near shocks than a strictly conservative counterpart of the same formal order.展开更多
文摘为探讨RD X基高聚物黏结炸药在小尺寸下爆轰产物的状态方程,采用两种直径(Φ10 m m和Φ25 m m)的圆筒试验研究了RD X基高聚物黏结炸药的做功能力,获得了圆筒壁膨胀位移、速度与时间的关系;利用非线性有限元动力学程序A n sy s/L s-D yn a,对炸药的圆筒实验进行了数值模拟;通过与实验结果相比较,得到了RD X基高聚物黏结炸药爆轰产物JW L状态方程参数。
基金supported by Lawrence Livermore National Laboratory under the auspices of the U.S.Department of Energy through contract number DE-AC52-07NA27344.
文摘Conservative numerical methods are often used for simulations of fluid flows involving shocks and other jumps with the understanding that conservation guarantees reasonable treatment near discontinuities.This is true in that convergent conservative approximations converge to weak solutions and thus have the correct shock locations.However,correct shock location results from any discretization whose violation of conservation approaches zero as the mesh is refined.Here we investigate the case of the Euler equations for a single gas using the Jones-Wilkins-Lee(JWL)equation of state.We show that a quasi-conservative method can lead to physically realistic solutions which are devoid of spurious pressure oscillations.Furthermore,we demonstrate that under certain conditions,a quasi-conservative method can exhibit higher rates of convergence near shocks than a strictly conservative counterpart of the same formal order.
