Characteristic line determination theory electron transport calculation method based on continuous moderation approximation

By employing a characteristic line deterministic method based on the continuous slowing approximation, the electron transport problem is transformed into a multi-group neutral particle transport problem, which solves the computational efficiency and stability issues under complex geometric conditions and achieves efficient electron transport computation.

CN121859682APending Publication Date: 2026-04-14XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202610048228.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-14
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing methods for calculating electron transport are inefficient and produce unstable results under complex geometric conditions, making it difficult to meet the needs of engineering analysis. In particular, the Monte Carlo method is computationally expensive, the discrete ordinate method is not suitable for complex geometry, and existing deterministic methods lack applicability.

Method used

We adopt a characteristic line determination theory method based on the continuous slowing approximation. By discretizing the energy of the continuous slowing approximation operator and constructing multi-group pseudo-section data, we can transform the electron transport problem into a multi-group neutral particle transport problem. We then introduce the characteristic line method solution framework for integral solution, which avoids statistical noise and is applicable to complex geometries.

Benefits of technology

It achieves stable and deterministic electron transport calculation results, reduces engineering implementation costs, is applicable to analysis under complex geometric conditions, and integrates with existing neutron and photon transport analysis workflows.

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Abstract

The invention discloses a characteristic line determination theory electron transport calculation method based on continuous moderation approximation, and belongs to the technical field of radiation transport calculation and nuclear engineering numerical analysis. The method comprises the following steps of: depicting an electron transport process by adopting an electron transport equation containing a continuous moderated approximation operator; enabling a continuous moderated approximation operator to be equivalent to an energy group shift-out item and a lower scattering source item through rhombus difference approximation in an energy dimension, thereby reconstructing an electron transport equation into a standard multi-group Boltzmann transport equation form; and constructing multi-group pseudo cross-section data based on a discrete result, introducing an existing neutral particle characteristic line method solving framework, and realizing deterministic theory calculation of electron transport on the premise of not changing a solver core algorithm. Statistical noise of a Monte Carlo method is avoided, a mature solver can be directly reused to complete electronic transport calculation, and compared with a mainstream discrete longitudinal standard method, the method is more suitable for engineering calculation under complex geometric conditions and is easy to integrate with an existing transport analysis process.
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