Abstract
This work establishes the unified lattice Boltzmann (LB) framework, namely lbmNTH, to simulate the fully coupled neutronics-thermal-hydraulics (NTH) process in nuclear reactor. The neutron transport and delayed neutron precursor balance are simulated using the finite-Boltzmann schemed LB models with considering the temperature feedback. The fluid flow is simulated using the large-eddy-based LB model, and the convection heat transfer with fission generation also is considered under the LB framework. All the LB models have the same data structure and implementation, which simplifies the data exchange between different physical fields, and no extra data interpolation is required. Numerical results show that the proposed lbmNTH framework can simulate the coupled NTH process flexibly. The temperature feedback has a strong effect in high-temperature conditions, while the high flow velocity can effectively improve the heat transfer capability. This work can provide an optional multi-physics technique to analyze the coupled neutronics-thermal-hydraulics process in nuclear reactor engineering.
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