Method for determining size of computational fluid dynamics analysis grid of digital reactor

A technology of computational fluid dynamics and grid size, which is applied in electrical digital data processing, design optimization/simulation, instruments, etc., can solve the problems of resources and time-consuming calculations, and achieve workload saving, clear mathematical principles, and simple input Effect

Active Publication Date: 2020-01-24
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
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Problems solved by technology

For large-scale numerical calculations of digital reactors, this method requires long resources and time-consuming calculations,

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  • Method for determining size of computational fluid dynamics analysis grid of digital reactor
  • Method for determining size of computational fluid dynamics analysis grid of digital reactor
  • Method for determining size of computational fluid dynamics analysis grid of digital reactor

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Embodiment Construction

[0041] In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other if they do not conflict with each other.

[0042] In the following description, many specific details are explained in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from the scope described here. Therefore, the protection scope of the present invention is not disclosed below. Limitations of specific embodiments.

[0043] The invention adopts the programming method to realize the precise solution of the one-dimensional Riemann problem (Riemann problem), can automatically output the spatial distribution of physica...

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Abstract

The invention discloses a method for determining the size of a computational fluid mechanics analysis grid of a digital reactor, which comprises the following steps of: dividing the digital reactor into a group of computational grids in space, and determining the geometric size of each grid and the central coordinate of each grid; obtaining initial boundary condition parameters; establishing an equation set corresponding to the one-dimensional Riemann problem, and solving and obtaining an accurate solution of the grid; establishing a one-dimensional Riemann problem approximate discrete solvingmodel, and obtaining an approximate solution of the grid through calculation of the model; and comparing the approximate solution of the grid with the exact solution of the grid. The method has the characteristics of clear principle, high precision, simple calculation input and low calculation time consumption, can meet the modeling requirements of large-scale computational fluid mechanics analysis and calculation grids and quickly determine the sizes of the unit calculation grids, and is particularly suitable for evaluating a grid modeling scheme of large-scale CFD calculation.

Description

Technical field [0001] The invention relates to the field of pressurized water reactor operation analysis, and in particular, to a method for determining the grid size of a digital reactor computational fluid dynamics analysis. Background technique [0002] The digital reactor establishes a numerical analysis model for the actual pressurized water reactor core, fuel assembly, containment and related safety systems, and evaluates the system response under normal operation and accident transients through computational fluid dynamics methods, so as to optimize pressurized water The safety design of the reactor system, comprehensive and accurate mastery of the thermal and hydraulic characteristics of the system provide a solid foundation, and it has the characteristics of high analysis accuracy and low cost. [0003] Computational fluid dynamics analysis requires that the analyzed system be divided into a set of computational grids in space, and the law of basic physical parameters in ...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/14
Inventor 李松蔚杨帆冉旭刘余邓坚
Owner NUCLEAR POWER INSTITUTE OF CHINA
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