一种氦氙冷却移动式核反应堆确定论多物理场耦合仿真模拟方法，通过蒙卡模拟中子输运得到的截面库以及预设冷态下的几何参数，模拟生成计算所使用的网格，根据预设的冷态下的温度分布进行中子多群扩散计算，得到中子通量分布和功率空间分布；再结合氦氙冷却通道边界条件与功率空间分布，使用开源有限元框架FeniCS依次计算得到温度场和基体的结构位移；最后使用更新后的温度和几何参数对堆芯模型、材料参数与核数据进行修正，重新执行中子扩散计算，通过重复迭代直至满足收敛条件，得出核热力耦合条件下的堆芯的中子场、功率场、温度场、应力场和位移场，实现对氦氙冷却移动式核反应堆的仿真模拟，对堆芯设计、多物理场仿真和反应堆安全设计具有重要作用。

A deterministic multi-physics field coupled simulation method for helium-xenon cooled mobile nuclear reactors is used to simulate the cross-section library obtained from the simulation of neutron transport by Monte Carlo as well as the geometrical parameters in the preset cold state, simulate the generation of grids used in the calculations, and then carry out neutron multi-group diffusion calculations based on the preset temperature distributions in the cold state, to obtain the neutron flux distributions and the power space distributions; and then combine the helium-xenon cooled channel boundary conditions with the power space Then, using the open-source finite element framework FeniCS, the temperature field and structural displacement of the substrate are sequentially calculated; finally, the core model, material parameters and nuclear data are corrected using the updated temperature and geometric parameters, and the neutron diffusion calculation is re-executed, and the neutron field, power field, temperature field, stress field, and displacement field of the core under the nuclear-thermal coupling condition are obtained by repeating the iteration until the convergence condition is satisfied. The simulation of helium-xenon-cooled mobile nuclear reactors plays an important role in core design, multiphysics field simulation and reactor safety design.