A finite element-based multi-physics coupling dynamic response analysis method for nuclear reactor systems

By establishing a fully coupled model of the nuclear reactor system and using the finite element method for discretization and solution, the accuracy and efficiency problems of multiphysics coupling analysis in traditional methods are solved, thereby improving the safety and economy of the reactor.

CN116451526BActive Publication Date: 2026-04-14XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202310315309.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-28
Publication Date
2026-04-14
Estimated Expiration
2043-03-28

AI Technical Summary

Technical Problem

Traditional single-physics software is difficult to analyze multi-physics coupling problems in nuclear reactor systems, resulting in low analysis accuracy, incomplete consideration of coupling effects, low solution efficiency, and insufficient research on multi-physics coupling solution methods, which affects the safety and economy of the reactor.

Method used

Using the finite element method, a fully coupled model of the thermal, structural mechanics, water chemistry, and neutron physics of a nuclear reactor system is established. A large set of residual equations is discretized and constructed using the finite element method, and solved using a transient nonlinear process solver, revealing the multi-level coupling effects between complex physical fields within the reactor.

Benefits of technology

It achieves deep coupling of thermo-mechanical-chemical multi-scale and multi-physics fields, improves the numerical analysis capability of nuclear reactors, enhances reactor safety and economy, and provides a reference for optimized design and safe operation.

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Abstract

A kind of nuclear reactor system multi-physical coupling dynamic response analysis method based on finite element, steps as follows:1, establish nuclear reactor thermal, structural mechanics and water chemistry key model, including reactor system two-fluid six equation model, reactor core sub-channel two-fluid eight equation model, fuel element pellet nonlinear constitutive model and activated corrosion migration model;2, establish reactor neutron physical transport model;3, by traditional finite element and discontinuous finite element method, nuclear reactor system thermal, reactor core sub-channel, structural mechanics, water chemistry analysis and neutron physical model are dispersed, form thermal-power-chemical full coupling, and tightly coupled with neutron physics Large residual equation;4, using transient nonlinear process solver, large residual equation is solved, and the transient distribution of each physical field parameter in the reactor is obtained.The method can analyze the multi-level coupling effect mechanism between complex physical fields in the reactor, and provide technical guidance for the challenging problems that the reactor core may face.
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