2020 Fiscal Year Research-status Report
A Multi-physics Compressible-Incompressible Computational Framework for Mechanistic Simulation of Steam Explosion in Fuel-Coolant Interaction
| Project/Area Number |
19K15478
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Duan Guangtao 東京大学, 大学院工学系研究科(工学部), 特任助教 (40804852)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | Particle methods / MPS method / SPH method / Vaporization / Solidification / Multiphase flow |
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| Outline of Annual Research Achievements |
The following work was mainly conducted to develop a particle method for simulating the fuel-coolant interaction (FCI):
(1) The free surface stability was further improved based on error analysis. Therefore, the FCI problem with a free surface could be simulated more stably.
(2) The developed vaporization model by coupling MPS and SPH had been combined with the solid-liquid phase change model in MPS.
Two journal papers have been published, and one manuscript is under review now.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The project is progressing based on the proposed plan. The main objective of the second year is to combine the vaporization and solidification phase-change models in particle methods. New techniques were developed to inserting the gas particles at the vaporization interface, especially at the initial state without gas nucleates. The second-year aim of the project has been realized, paving a good way for the last year. Therefore, I regard the project is progressing rather smoothly.
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| Strategy for Future Research Activity |
The overall aim of the project is to develop a meshfree particle method for the fuel-coolant interaction problems with both vaporization of coolant (first year) and solidification of fuel melt (second year). The numerical method has been developed in the first two years.
In the third year, some multiphase problems with heat transfer, vaporization and solidification will be simulated. The influence of liquid viscosity and initial temperature of melt on the fuel-coolant interaction will be investigated by the developed meshfree particle method.
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