Transition region based Monte Carlo and certainty theory coupled particle transport method

A particle transport and transition area technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as error-prone, error-prone calculation results, manual area division depends on user experience, etc., to ensure correctness sexual effect

Active Publication Date: 2017-01-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the purpose of the present invention is to solve the problem that the manual area division of the existing Monte Carlo and deterministic coupling method relies on user experience and is prone to error, and improves the problem caused by the simple and direct coupling of the two calculations. The calculation results are prone to errors

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  • Transition region based Monte Carlo and certainty theory coupled particle transport method

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[0027] The fusion shielding benchmark example is a neutron benchmark example released by the Alamos National Laboratory in the United States in 1991. The present invention selects the 7th device of this model as application example problem. The entire geometry of the model is within a cuboid of 899.16cm×690.85cm×678.18cm. The model contains a 55.88cm thick shielding layer, which is mainly composed of iron and boric acid polyethylene materials. In the cement shielding structure of the model, there is a deuterium-tritium fusion neutron source with an energy of 14 MeV, and the coordinates are (-356.87, 232.02, 157.40). The counting area is all cells in the whole space, and the type is volume flux.

[0028] Preliminary automatic division of deterministic and Monte Carlo particle transport regions:

[0029] According to the geometric characteristics of the fusion shielding benchmark example, select a cube bounding box, take the position of the neutron source as the center of the ...

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Abstract

The invention discloses a transition region based Monte Carlo and certainty theory coupled particle transport method. According to the particle transport method, analysis on geometry complexity is carried out based on a CAD model, the geometrically complex region is defined as an MC particle transport calculation region while the geometrically simple region is defined as a certainty-theory transport calculation region according to physical property; a transition region is created between the two regions on the basis of the physical property and thickness of the transition region is set. In particle transport calculation, MC particle transport calculation is carried out in the MC particle transport region and the transition region, certainty-theory calculation is carried out in the certainty-theory region and the transition region, and calculation results of the transition region by the two calculations are identical through multiple iterative computations, so that seamless coupling of the two calculations is realized. With the transition region, accuracy of the final calculation result is guaranteed through the multiple iterative computations. The transition region based Monte Carlo and certainty theory coupled particle transport method is an effective particle transport calculation method for shield analysis of large-size reactors.

Description

technical field [0001] The invention relates to a particle transport calculation method, a transition region-based Monte Carlo and deterministic coupled particle transport method, which is used for reactor shielding analysis in the fields of nuclear physics, nuclear technology applications, and the like. Background technique [0002] At present, there are deterministic method and probabilistic method (Monte Carlo (MC) method) commonly used in particle transport simulation methods, both of which have advantages and disadvantages. The deterministic method is to solve the transport equation by numerical method, which has a fast calculation speed, but cannot deal with complex geometries, and there are many approximations and assumptions in the processing process, and the calculation accuracy decreases sharply with the complexity of the problem. The MC method simulates the process of the interaction and transport of real particles in the material and matter, and performs statisti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/00G06F30/20G06F2111/08Y02E30/30G21C17/001
Inventor 吴宜灿胡丽琴龙鹏程郝丽娟宋婧
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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