Method for determining grid sizes for underwater explosion numerical simulation

Abstract

The invention discloses a method for determining grid sizes for underwater explosion numerical simulation. The method includes steps of 1, setting a series of dimensionless variable values and respectively acquiring corresponding integral average errors for the various values; 2, acquiring value ranges with the integral average errors not larger than error thresholds; 3, combining formulas with one another according to the value ranges and acquiring the grid sizes according to given explosive equivalent weights and given explosive density of underwater explosion numerical simulation. The thresholds are set according to engineering experience. The method has the advantages that the method is efficient, convenient and speedy, and the inconsistent grid sizes can be adopted under different conditions, so that simulation results are accurate and reliable, and the method is applicable to underwater explosion numerical values under conditions of different underwater explosion environments and the different explosive equivalent weights.

Description

technical field [0001] The invention relates to a grid size determination method for numerical simulation of underwater explosions, which is suitable for numerical simulations of underwater explosions in the fields of water conservancy science and ocean engineering such as water conservancy and hydropower, ships, ports, and coastal areas. Background technique [0002] When the numerical simulation method is used to study the underwater detonation of explosives, the process of shock wave propagation, the process of underwater expansion and movement of detonation products, the coupling effect of multi-media, the dynamic response of structures, and the process of damage and destruction, the accuracy of the simulation results depends largely on the The grid size used for the numerical model. Usually, using a smaller grid size, more accurate numerical simulation results can be obtained. However, when a sufficiently small grid size is used, the number of units in the numerical mo...

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Problems solved by technology

However, at present, when some researchers determine the grid size for numerical simulation, they often analyze the convergence of the grid size first, and then analyze whether the selected grid size meets the requirements after the convergence analysis, and the calculation efficiency is not high; some researchers It is feasible to directly use a smaller grid size to study underwater explosion problems, which is feasible for small-scale underwater explosion problems. However, for complex underwater explosion environments such as high dams, ships, and coasts, often due to the large calculation scale and terminate

When the grid size is determined according to the minimum wavelength of the shock wave, it is necessary to determine the shock wave frequency at different proportions of the explosion distance. However, it is difficult to determine the minimum wavelength of each explosion scene before the transient numerical analysis, and it is difficult to apply a uniform grid size in different explosion scenarios

At present, the grid size used in numerical simulation of underwater explosion is not uniform, and the grid size used by different researchers in modeling is quite different. A method for determining the grid size suitable for numerical simulation of underwater explosion needs to be proposed

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