Study on Multi-physics Coupling Calculation of Xi’an Pulsed Reactor Based on MOOSE Platform
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摘要: 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。Abstract: 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.
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Key words:
- Multi-physics coupling /
- Xi’an Pulsed Reactor /
- MOOSE /
- Steady-state analysis /
- Transient-state analysis
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