Three-dimensional quasi-transport acceleration method for uniform geometric variational nodal method

A technology of variational segmental and neutron transport equations, applied in the field of three-dimensional quasi-transport acceleration, can solve problems such as high calculation costs, and achieve the effects of reduced calculation time, better calculation memory, and reduced calculation memory

Active Publication Date: 2021-11-19
SHANGHAI JIAO TONG UNIV
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of high computational cost of the existing uniform geometric variational nodal method in large-scale reactor three-dimensional neutronics simulation, the present invention proposes a three-dimensional quasi-transport acceleration method for the u

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-dimensional quasi-transport acceleration method for uniform geometric variational nodal method
  • Three-dimensional quasi-transport acceleration method for uniform geometric variational nodal method
  • Three-dimensional quasi-transport acceleration method for uniform geometric variational nodal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] This embodiment relates to a three-dimensional quasi-transport acceleration method for the uniform geometric variational nodal method, including the following steps:

[0023] Step 1: Solve the neutron transport equation: starting from the steady-state neutron transport equation, separate the leakage term in the equation into axial leakage part and radial leakage part: Among them: subscript p means radial contribution, z means axial contribution; introduce odd and even neutron angular flux densities And omitting the higher-order derivative terms, the second-order even-parity neutron transport equation without the axial and radial cross-derivative terms is obtained Among them: Ω is the neutron motion direction; ∑ t and ∑ s are the macroscopic total cross-section and the macroscopic scattering cross-section; ψ + is the even-parity neutron angular flux density; φ is the neutron standard flux density; q is the source term, including intergroup scattering sources and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a three-dimensional quasi-transport acceleration method for a uniform geometric variation nodal method. An axial and radial cross derivative term in a second-order even-space neutron transport equation is eliminated through quasi-transport approximation processing; considering that in an actual pressurized water reactor, axial non-uniformity is weak, in a Ritz discrete process, diffusion approximation is adopted for angular distribution of odd neutron angular flux density on an axial surface; in the Ritz discrete process, the number of odd neutron angular flux density angle basis functions of a radial surface is reduced by using the symmetry of the angle space. According to the method, the calculation efficiency can be greatly improved and the calculation memory can be reduced under the condition that the calculation precision is not obviously influenced, so that the method is used for accurate and efficient neutronics simulation in nuclear reactor design.

Description

technical field [0001] The invention relates to a technology in the field of nuclear engineering, in particular to a three-dimensional quasi-transport acceleration method for the uniform geometric variational segmental method. Background technique [0002] In reactor design, in order to analyze the neutronics performance and safety of the reactor, accurate and efficient neutronics simulation of the reactor is required to obtain the effective multiplication coefficient of the reactor and the neutron flux density distribution in the reactor. The effective multiplication coefficient and neutron flux density are obtained by solving the neutron transport equation. At present, the widely used method for solving the neutron transport equation is the variational segment method, which divides the reactor area into a series of typical segments , by constructing the corresponding response matrix for typical nodes and completing the solution of the response matrix equation, the effectiv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F30/20G06F17/11G06F17/16G06F111/10
Inventor 殷晗张滕飞刘晓晶熊进标柴翔
Owner SHANGHAI JIAO TONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap