Systems and methods of conducting numerical simulation of an underwater explosion

Abstract

The invention discloses systems and methods of conducting numerical simulation of an underwater explosion. Characteristics of a blast source and a FEA model representing a surrounding fluid domain are defined. One layer of new border nodes and elements are created outside of the fluid domain's original outer boundary formed by the original border elements. Each new border elementde is associated with one of the original border elementsdes as corresponding master elementde. At each time step of a time-marching simulation of an underwater explosion, simulated fluid behaviors are computed for all but the new border elements. The computed fluid behaviors of each original border element are saved into a corresponding lookup table configured to store the computed fluid behaviors for a predefined number of time steps in a first-in-first-out manner. Simulated fluid behaviors of each new border element are determined by interpolating, with the calculated blast wave propagation time from the master element, the stored fluid behaviors in the corresponding master element s lookup table.

Description

technical field [0001] The present invention relates generally to methods, systems and software products for use in computer-aided engineering analysis, and more particularly to methods for performing efficient numerical simulations of underwater explosions. Background technique [0002] Finite element analysis (FEA) is a computer-implemented method using digital techniques for finding suitable solutions to partial differential equations representing complex systems such as three-dimensional nonlinear structural design and analysis. FEA arose from the need to solve complex elastic and structural analysis problems in civil and aeronautical engineering. With the advancement of computer technology, FEA has become an important tool to assist engineers and scientists in making decisions in improving structural design (eg, automobiles, aircraft, etc.). When FEA is applied in the time domain to solve physical problems or events, it is called time-marching simulation. In general, ...

AI Technical Summary

Problems solved by technology

The prior art approach to correct this problem / disadvantage is to scale up the FEA model, or apply artificial normal and shear stresses at the boundaries of the FE model to compensate for the effect of this stress wave reflection, although this prior art method can reduce some effects, but it cannot eliminate them

Furthermore, prior art methods require many special techniques that are not easily implemented

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