数值模拟辐射驱动2维内爆压缩过程

Numerical simulation of 2D radiation-driven implosion process

采用2维三温非平衡辐射流体力学程序LARED-H数值模拟辐射驱动内爆过程。针对2维三温能量方程九点差分格式离散后的线性方程组,采用了高效的Krysolv子空间迭代解法,改进了代数解法器。将1维间接驱动内爆总体程序CFJ与LARED-H程序的计算结果进行比对,验证了LARED-H程序数值模拟1维内爆问题的正确性。并数值模拟了不同腔长辐射温度源驱动下的2维靶球运动,数值结果显示:随着腔长的增加,高压缩内爆燃料区分别被压缩成香肠形、球形和铁饼形,数值模拟结果与神光Ⅱ的实验结果定性上相同。

The two-dimensional（2D） three-temperature radiation hydrodynamics code,LARED-H（laser radiation electron dynamic hohlraum）,is improved to simulate the 2D radiation-driven implosion process.In order to solve the linear-algebraic equations discretized from the two-dimensional and three-temperature energy equations by a nine point scheme,the efficient solver of Krylov method is used for improving the iterative capability.The numerical result comparison with 1D CFJ code shows the accuracy of the LARED-H code.Finally,the compressed shapes of the capsule driven by a radiation field in cylindrical gold hohlraums with different length are simulated by the LARED-H code.The shape of the fuel becomes sausage-like,ball-like or cake-like,respectively with the different hohlraum length,which agrees well with that derived in the SG-Ⅱ experiments.