高保真中子输运计算的多级加速理论及应用

Atomic Energy Science and Technology(2022)

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Abstract
为解决高保真中子输运计算耗时严重的问题,本文提出了多级加速理论.其中,针对迭代求解过程,采用迭代加速的思路,即通过等价的低分辨率系统加速以减少迭代次数;针对瞬态求解,采用时间步加速方法,通过建立多级预估校正系统,实现在大时间步长下开展准确的高保真中子输运计算.最终引入不同分辨率系统的概念,将时间步加速方法与迭代加速方法整合形成一套完整的多级加速理论,并将其应用到精细化中子物理计算程序HNET中.采用典型瞬态基准题验证HNET程序加速效果.数值结果表明:多级加速理论能够在保证高保真中子输运计算精度的同时,极大地提升计算效率.
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Key words
high-fidelity neutron transport calculation,multi-level acceleration theory,iterative acceleration,time-step acceleration
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