A core physics-thermal coupling simulation method based on a multiphysics framework

Abstract

The invention discloses a core physics-thermal coupling simulation method based on a multi-physics framework, which can integrate neutron physics programs and thermal-hydraulic programs not developed based on the multi-physics framework into the framework, so as to realize the multi-physics framework. Physics-thermal coupling calculations driven by the physics framework. The steps are as follows: 1. Set the core and calculation time in the neutron physics program and the thermal hydraulic program; 2. Establish the core grid in the multiphysics framework; 3. Use the multiphysics framework to call the neutron physics program Carry out steady-state calculation and transfer the calculated power; 4. Use the multi-physics framework to call the thermal-hydraulic program for steady-state calculation, and transfer the calculated thermal-hydraulic parameters; 5. Repeat steps 3 to 4 until the fuel temperature converges; 6. Invoke the neutron physics program to perform transient neutron physics calculations; 7. Invoke the thermal hydraulic program to perform transient thermal hydraulic calculations; 8. Repeat steps 6 to 7 to complete the calculations for all periods.

Description

technical field [0001] The invention relates to the field of nuclear reactor core design and safety analysis, in particular to a core physics-thermal coupling simulation method based on a multi-physics field framework. Background technique [0002] A nuclear reactor is a complex system involving multiple physical fields such as thermal hydraulics, neutron physics, and mechanics. It is a multi-scale and multi-physical field interaction system. In the past, when the computing technology was immature and the computer could not meet the real multi-physics coupling calculation requirements of the nuclear reactor core, the core design and thermal-hydraulic safety performance analysis of the reactor were usually calculated in a decoupled way, that is, when calculating a physical field Conservative assumptions are made for other relevant physics. Although this calculation method can ensure the conservativeness of the calculation results, it also sacrifices the accuracy of the coupl...

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Problems solved by technology

[0004] At present, although many scholars have made many attempts on core physics-thermal coupling calculations based on multiphysics frameworks, there is no general and efficient method to realize neutron physics programs and thermal calculations that are not developed based on multiphysics frameworks. coupled calculation of engineering and hydraulic programs; moreover, in the realized examples of physics-thermal coupling calculations based on the multiphysics framework, it is usually necessary to make major changes to the neutron physics program and thermal-hydraulic program. Two programs need to be started many times, not only the development efficiency is relatively low, but also the efficiency of physics-thermal coupling calculation is reduced

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