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Numerical simulation of a single molten 316SS droplet penetrating into sodium pool with MPS method   YANG Zhi1, ZHANG Zhi-gang2,*, WEI Wei3, and HAO Xiao-yu4   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Number 145, Nantong Street, Harbin 150001, China (yang_zhi@hrbeu.edu.cn) 2. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Number 145, Nantong Street, Harbin 150001, China (zg_zhang@hrbeu.edu.cn) 3. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Number 145, Nantong Street, Harbin 150001, China (wei1993126@163.com) 4. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Number 145, Nantong Street, Harbin 150001, China (haoxiaoyu@hrbeu.edu.cn)   Abstract: Severe core disruptive accidents in the sodium-cooled fast reactor and core molten materials and the coolant sodium interaction (including fuel-coolant interaction and structural material-coolant interaction), are one of the international key and difficult problems on the core safety studies of reactor, especially for drastic changes of the multiphase flow, heat transfer between cold and hot molten fluid interface, deformation and fragmentation behaviors of the molten material, etc. Considering that there are so many difficulties with large deformation and numerical diffusion problems in traditional mesh method, a meshless moving particle semi-implicit (MPS) method is introduced to the present structural material-coolant interaction research. The viscosity model, surface tension and passively moving solids (PMS) model are all taken into consideration. With the improved MPS algorithm, the stability and accuracy of the computation have much increased. The present MPS method is validated by simulating the experiments of a single molten Type 316 stainless steel (316SS) droplet penetrating into sodium pool which was conducted by Zhang. The penetrating, fragmentation and solidification process of the droplet in the simulation are discussed. The comparison of the predicted dimensionless fragment size (D/D0) distribution with the experimental results shows a good agreement for the small-sized fragments part. The present research indicates that the typical solidification and fragmentation behavior of the structural material-coolant interaction process can be successfully simulated by MPS method. Keyword: structural material-coolant interaction; molten 316SS droplet; MPS method; solidification; fragmentation
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