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High-precision numerical simulation method based on accurate solution of Riemannian problem

A Riemannian problem and numerical simulation technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems affecting the accuracy of calculation results, large interface state errors, etc., and achieve suppression of non-physical vibrations Phenomena, Accuracy Improvement, Effect of Accuracy Improvement

Active Publication Date: 2021-09-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In view of the fact that the Riemann problem in the existing multi-substance interaction numerical simulation method adopts an approximate solution method, there are problems such as large interface state errors and affecting the accuracy of calculation results, etc., the invention discloses a multi-substance interaction based on the accurate solution of the Riemann problem The technical problems to be solved by the high-precision numerical simulation method are: to realize the accurate solution to the Riemann problem of the arbitrary state equation, to obtain the precise interface state of the multi-substance interaction, to improve the accuracy of the numerical calculation results of the multi-substance interaction process, Interaction process prediction accuracy, and then solve engineering technology problems related to the field of multi-substance interaction

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  • High-precision numerical simulation method based on accurate solution of Riemannian problem
  • High-precision numerical simulation method based on accurate solution of Riemannian problem
  • High-precision numerical simulation method based on accurate solution of Riemannian problem

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Embodiment 1

[0072] In order to better illustrate the purpose and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0073] The application of this embodiment in the calculation example of the interaction between the explosive blast shock wave and the protective structure.

[0074] The initial geometric model in the calculation example disclosed in this embodiment is shown in the accompanying drawing (5), the shock wave protection structure and the pressure monitoring points are presented in the accompanying drawing (6) and the accompanying drawing (7) respectively, and the pressure of the explosion flow field at different times The isosurface diagram is shown in the accompanying drawing (8), the numerical simulation pressure cloud diagram of the interaction between the explosion shock wave and the protective structure is presented in the accompanying drawing (9), and the comparison of t...

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Abstract

The invention discloses a high-precision numerical simulation method based on accurate solution of a Riemannian problem, and belongs to the field of multi-substance interaction high-precision numerical simulation. According to the method, a multi-substance random state equation Riemannian problem accurate solving method and a virtual fluid method (GFM) are combined, a real virtual fluid method (RGFM) and a wall surface virtual fluid method (WGFM) are included. Meanwhile, a weighted essential no-oscillation (WENO) finite difference method and a level set method (Level-Set) are coupled to form a high-precision numerical simulation method. According to the invention, the dissipation of shock waves and sparse waves in the propagation process can be reduced; a non-physical oscillation phenomenon generated at an interface when an Euler equation is solved can be effectively inhibited, and stable operation of a numerical value prediction process is guaranteed; by means of the method, the Riemannian problem of any state equation can be accurately solved, the accurate interface state of multi-substance interaction is obtained, the precision of the numerical calculation result of the multi-substance interaction process is improved, the prediction precision of the multi-substance interaction process is improved, and then the engineering technical problem related to the field of multi-substance interaction is solved.

Description

technical field [0001] The invention relates to a high-precision numerical simulation method based on the precise solution of the Riemann problem, and belongs to the field of high-precision numerical simulation of multi-substance interaction. Background technique [0002] Explosion of explosives is accompanied by a violent chemical reaction, which forms an explosion shock wave that propagates outward and produces a large number of explosive gas products. Studying the propagation law of explosion shock wave plays an important role in preventing the damage of structure caused by explosion shock wave. [0003] The research on air explosion of explosives mainly includes theoretical derivation, numerical simulation and experimental research. Theoretical derivation has a certain guiding significance in the early research, but the explosion has the characteristics of high temperature, high pressure, high speed, etc., and is a typical complex nonlinear problem, which causes great d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F113/08
CPCG06F30/23G06F30/28G06F2111/10G06F2113/08
Inventor 王成仲彦旭王万里赵富裕
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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