1. Numerical investigation of dynamic characteristics of debris bed formation based on CFD-DEM method.
- Author
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Ding, Wen, Chen, Ronghua, Tian, Wenxi, Qiu, Suizheng, and Su, G.H.
- Subjects
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NUCLEAR fuel rods , *DISCRETE element method , *NUCLEAR reactor accidents , *COMPUTATIONAL fluid dynamics , *PRESSURE vessels - Abstract
• The CFD-DEM method is a new method developed for the formation of debris bed from irregularly shaped debris. • The simulation for DEFOR-E7 is performed and analyzed with the debris size obtained by the SEINA code. • The deposition morphology of a debris bed with a height of 0.1 m, a repose angle of 35° and a porosity of 72 % in DEFOR-E7 test are obtained. In a severe accident in nuclear reactor, the core meltdown occurs when nuclear fuel rods cannot be sufficiently cooled, thus forming debris beds with specific shapes on the lower head of the Reactor Pressure Vessel (RPV). In this paper, the fluid–solid interaction during debris bed formation is studied based on Computational Fluid Dynamics method coupled with Discrete Element Method (CFD-DEM). The CFD models are used to simulate the flow and pressure field of fluid, the DEM models are used to calculate the collision between solids and the collision between solids and wall, as well as the fluid–solid interaction force can be calculated by the two-way coupling models. The DEM models and CFD-DEM models were validated by different experiments. Based on the above models, the DEFOR-E7 test was simulated, and a conical debris bed formed by irregular debris with a static angle of 35° and a porosity of 72% was obtained. Therefore, the method and findings in this paper are significative on theory and application for the study of nuclear severe accidents. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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