A high precision numerical simulation method of underwater explosion shockwave load in near field

Abstract

The present invention provides a high-precision numerical simulation method for near-field underwater explosion shock wave load, belonging to the technical field of underwater explosion numerical simulation. The invention adopts discontinuous Galerkin method (RKDG) and third-order TVD Runge-Kutta method to discretize the nonlinear Euler equations with high compressibility. The virtual flow method(GFM) is used to pretreat the physical quantities on both sides of the gas-liquid interface, which can effectively reduce the non-physical oscillation caused by the physical quantity discontinuity. The level set method (LSM) is used to deal with the complex topological structure changes on the material interface, so as to realize the accurate capture of the moving interface. The method proposed bythe invention can effectively simulate the generation and propagation process of the near-field underwater explosion shock wave load; the numerical simulation results are in good agreement with the classical empirical formulas and the experimental results, which proves that this method has some advantages in dealing with the problems of strong compressibility, strong discontinuity, transient andstrong nonlinearity.

Description

technical field [0001] This invention proposes a high-precision numerical simulation method for near-field underwater explosion shock wave load, which belongs to the technical field of underwater explosion numerical simulation. Background technique [0002] As maritime security issues become increasingly prominent, countries around the world are competing to develop advanced underwater weapons with high speed, large doses, and precise guidance, which pose a great threat to large surface ships such as submarines and aircraft carriers. The shock wave load generated by the underwater weapon explosion can have a peak pressure of up to GPa level, which will cause overall damage to the ship structure. Therefore, it is of great significance to effectively simulate the shock wave load characteristics of underwater explosions for the design of ship safety protection. In addition, there is also a huge demand for this technology in the fields of performance evaluation of underwater we...

AI Technical Summary

Problems solved by technology

This method has a certain guiding significance in the early research, but at the same time there are many defects: (1) The theoretical model is relatively simple, and the research results cannot solve practical engineering problems

(2) Some simple artificial assumptions are introduced in the derivation process, and there is a certain error between the actual working conditions

(3) Involving many complex mathematical transformations, the research is difficult and the cycle is long

The shortcomings of the experimental test are: (1) The duration of the underwater explosion process is on the order of ms, and the peak pressure can reach the order of GPa, so the experimental measurement is extremely difficult

(2) Explosion experiments are extremely destructive, the loss of related measuring instruments is large, and the cost of experiments is relatively high

At the same time, there are certain safety risks for the experiment participants

(3) There are often uncertain factors in the experiment, and the repeatability is poor

However, there are still two deficiencies in these methods: (1) Most of them are suitable for far-field explosions, and there is a lack of research on near-field underwater explosions; (2) Many methods use low-order precision formats, which affects the accuracy of calculation results sex

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