数值模拟辐射驱动2维内爆压缩过程
Numerical simulation of 2D radiation-driven implosion process
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摘要: 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。
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关键词:
- LARED-H程序 /
- 辐射驱动 /
- 高压缩内爆 /
- Krysolv子空间迭代
Abstract: 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 a -
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