基于MOOSE平台的西安脉冲反应堆多物理耦合计算研究

Study on Multi-physics Coupling Calculation of Xi’an Pulsed Reactor Based on MOOSE Platform

反应堆中涉及一系列复杂相互作用的多物理耦合过程,随着高性能计算技术的迅速发展,基于多物理耦合的分析越来越受到重视。基于多物理耦合平台MOOSE开展了西安脉冲反应堆的稳态和瞬态多物理耦合计算研究,综合应用Picard迭代和Jacobian Free Newton-Krylov(JFNK)方法处理多物理耦合中的非线性问题,实现了三维中子扩散时空动力学、三维固体导热和一维流体流动传热的多物理耦合计算,计算了西安脉冲反应堆2 MW稳态运行和3.45$(1$表示一个有效缓发中子份额)脉冲运行条件下的反应堆行为,得到了堆芯三维功率和温度分布计算结果,计算结果与实验结果符合较好,证明了多物理耦合的正确性。开发的多物理耦合计算方法具有几何适应性好、耦合灵活等特点,具有应用于其他小型反应堆的潜力。

Nuclear reactors involve a series of multi-physics coupling processes with complex interactions.With the rapid development of high-performance computing technology,the analysis based on multi-physics coupling has been paid more and more attention.Based on the multi-physics coupling platform MOOSE,the steady-state and transient multi-physics coupling simulation of Xi'an pulsed reactor is studied.The nonlinear problems in multi-physics coupling are solved by Picard iteration and Jacobian Free Newton-Krylov(JFNK)method,and the multi-physical coupling calculation of three-dimensional neutron spatio-temporal dynamics,three-dimensional solid heat conduction and one-dimensional fluid flow and heat transfer is realized.The reactor behavior under 2 MW steady-state operation and 3.45$(1$ represents an effective delayed neutron fraction)pulse operation of Xi’an pulsed reactor is calculated,and the three-dimensional power and temperature distribution of the core are obtained.The calculated results are in good agreement with the experimental results,which proves the correctness of multi-physics coupling.The multi-physics coupling method developed in this paper has the advantages of good geometric adaptability and flexible coupling,and has the potential to be applied to other micro reactors.