【摘要】 为了研究封闭空间内放射性核素扩散迁移的规律，在OpenFOAM(开源的场运算处理软件)中对船用反应堆的舱室进行CFD(计算流体力学)建模，并通过Buoyant Simple foam(BSF)求解器和对Scalar transport foam(STF)求解器进行自定义对模型进行仿真模拟。实验结果显示，在第19秒时放射性核素开始往员工舱室进行扩散，第82秒开始往操作舱室进行扩散，但此时放射性核素的扩散迁移还是主要在热对流的作用下进行，在这之后放射性核素逐渐在重力作用下产生沉降充满舱室。研究表明，封闭空间内的放射性核素主要在热对流的作用下扩散至人员聚集处，离反应堆舱室越远扩散速度会越慢，然后在重力作用下产生沉降，充满整个舱室。更多还原

【Abstract】 In order to investigate the diffusion and migration patterns of radioactive nuclides in enclosed spaces, a Computational Fluid Dynamics(CFD) model of the compartments of a marine reactor was developed using OpenFOAM. The simulation was conducted utilizing the Buoyant Simple foam solver and the Scalar transport foam solver for custom simulations. Experimental results indicate that at 19 seconds, radioactive nuclides started diffusing into the crew compartment, and at 82 seconds, diffusion into the control room commenced. However, at this point, the diffusion and migration of radioactive nuclides primarily occurred under the influence of thermal convection. Subsequently, the radioactive nuclides gradually settled and filled the compartments due to gravitational effects. The research findings suggest that radioactive nuclides in enclosed spaces primarily diffuse towards areas of human occupancy under the influence of thermal convection. The farther away from the reactor compartment, the slower the diffusion rate. Subsequently, setting occurs under the influence of gravity, filling the entire compartment.更多还原