Underwater structure impact resistance calculation method considering underwater explosion bubble jet slamming

Abstract

The invention provides an underwater structure impact resistance calculation method considering underwater explosion bubble jet slamming, and belongs to the field of underwater explosion bubble dynamics. Comprising the following steps: determining various initial parameters, establishing a bubble and structure coupling calculation model, and dispersing bubbles and structure surfaces; solving the rigid body motion of the structure, and simulating the bubble form and the structure motion; the induced load of the bubbles in the flow field is decomposed into a pulsation load generated by bubble pulsation and associated with the internal and external pressure difference of the bubbles and a jet flow load generated by the non-spherical motion of the bubbles and associated with the boundary motion of the bubbles, and the two loads are calculated with the assistance of an auxiliary function method; and two parts decomposed from the bubble load are respectively input into a finite element analysis program, and shock resistance calculation is carried out. According to the method, the complex bubble load is decomposed into the jet flow load and the pulsation load according to the characteristics, and the method for considering the bubble jet flow influence in the structure impact resistance calculation is provided, so that the impact resistance calculation result is more consistent with the reality.

Description

technical field [0001] The invention relates to a method for calculating the impact resistance of an underwater structure considering underwater explosive bubble jet slamming, and belongs to the field of underwater explosive bubble dynamics. Background technique [0002] The loads generated by underwater explosion mainly include shock wave and bubble load. In the near-field explosion, the bubble will also produce jet phenomenon, and the damage to the underwater structure cannot be ignored. However, the existing numerical simulation method of underwater explosion mainly considers the effect of shock wave. The shock wave load is obtained according to the shock wave empirical formula, and the finite element commercial software is used to calculate the fluid-structure coupling between it and the underwater structure. For near-field underwater explosions, due to the existence of bubble jets, the load components are more complex. At present, there is no effective method to conside...

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for calculating the impact resistance of underwater structures considering the slamming of underwater explosion bubble jets, so as to solve the technical problems to be solved in the application of the present invention

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