论文部分内容阅读
介绍了“FP-1”电磁内爆实验中固体衬套内爆的一维单温磁流体力学计算。磁流体力学方程组采用隐式差分格式避免过小时间步长限制。方程组采用分裂法以克服非线性耦合可能引起的数值不稳定性。隐式格式采用Newton-Raphson法叠代求解,使用比较简单的叠代初值的给定方法。在解运动方程中当内界面达到轴时,给出了一种“逐步逼近”的独特算法克服收敛困难,此外,还给出了迭代初值公式以及其它的诸如虚网格设置自动步长调整等技术,状态方程数据使用Sesame数据库,因为温度不太高,韧致辐射被忽略,该方法给出一个在“FP-1”装置上做的固体套筒内爆实验的计算结果。
The one-dimensional single-temperature magnetohydrodynamics calculation of solid liner in “FP-1” electromagnetic implosion experiment is introduced. Magnetohydrodynamics equations using implicit difference scheme to avoid too small time step limit. The equations are split to overcome the numerical instability that nonlinear coupling may cause. Implicit format using Newton-Raphson method iterative solution, the use of a relatively simple iterative initial value given method. In the solution of the equation of motion, when the inner interface reaches the axis, a unique algorithm of “gradual approximation” is given to overcome the convergence difficulty. In addition, the iterative initial value formula and other automatic step adjustment In the Sesame database, the equation of state data is used. Since the temperature is not too high, the bremsstrahlung is neglected. This method gives the calculation result of a solid sleeve implosion experiment done on “FP-1” device.