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Rate theory parallel simulation method for vacancy and interstitial evolution of reactor key material

A technology of key materials and simulation methods, applied in the field of computer simulation of radiation damage of nuclear materials, to achieve the effects of fast simulation, improved solution speed, and reduced difficulty

Active Publication Date: 2019-11-15
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

Therefore, the difficulty of RT simulation lies in the efficient and accurate solution of ordinary differential equations

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  • Rate theory parallel simulation method for vacancy and interstitial evolution of reactor key material
  • Rate theory parallel simulation method for vacancy and interstitial evolution of reactor key material
  • Rate theory parallel simulation method for vacancy and interstitial evolution of reactor key material

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] From the general equations of rate theory RT simulation, it can be seen that when RT method is used to simulate the evolution of irradiation defects, a large number of rigid and coupled ordinary differential equations need to be solved. Although the traditional serial algorithm has high accuracy, as the number of equations increases, its simulation time becomes very long, which limits the number of defects that can be simulated. Therefore, the present invention provides a parallel algorithm based on exponential time difference. The algorithm can use parallel computing technology to expand the number of defects in RT simulation and quickly solve RT equations on the basis of ensuring accuracy.

[0026] Aiming at the problem that the rate equation is rigid, large, and difficult to solve, the present invention provides a rate-theoretical parallel s...

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Abstract

The invention relates to a rate theory parallel simulation method for vacancy and interstitial evolution of a reactor key material. The method comprises: converting a rigid differential equation intoan explicit format equation with a pre-estimation correction second-order exponential time difference format; reducing difficulty in solving, using a data parallel mode, dividing a group of ordinary differential equations (including N vacancy cluster evolution equations and N gap cluster evolution equations) into n groups, and solving m equations (wherein m is greater than or equal to 1) in each group in parallel by n processes respectively, so that the solving speed of the equations is increased, and efficient solving of rate equations and large-scale rapid simulation of vacancies and gaps are realized.

Description

technical field [0001] The invention relates to a computer simulation technology for radiation damage of nuclear materials, in particular to a rate theory parallel simulation method for the evolution of vacancies and gaps in key materials of a reactor. Background technique [0002] Rate theory (RT, Rate Theory) is an important method for simulating the long-term microstructural evolution of material radiation damage. It has the advantages of fast calculation speed, high calculation efficiency, and no time-space scale limitation. During the defect evolution process, the obtained defect velocity density and size distribution can be directly compared with the experiment. It has been widely used in the research of radiation-induced microstructure evolution, such as the simulation of material radiation swelling, the calculation of radiation growth, and the study of cluster precipitation. Wait. In the past 30 years, the rate theory has been used internationally to successfully ex...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 陈丹丹贺新福贾丽霞杨芸聂宁明杨文胡长军
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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