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Title: Numerical simulation and optimisation of a reinforced steel plate against underwater explosions

Authors: Arman Jafari Valdani; Armen Adamian

Addresses: Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran ' Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

Abstract: Optimum arrangement of reinforcing blades can increase the resistance of marine structures and reduce potential losses in the case of explosive events. In this research, to find the most appropriate arrangement, six different geometries were modelled in 3D (one base case and five cases with different arrangements of reinforcing blades). By using Lagrangian and Eulerian methods for grid generation, the effects of the explosion on these structures in the water environment were simulated, and the variation of the Von-Mises stress, damage parameter, strain, displacement, and displacement rate were predicted for all cases. The simulations were based on finite element-finite volume methods. The accuracy of the numerical approaches was confirmed by analysing benchmark problems and comparing the obtained results with analytical and experimental data. It was found that maximum damage takes place in Case A (plate without any blades) with maximum displacement and displacement rate of 521 mm and 151 mm/ms, respectively. Also, the results of parametric simulations revealed that Case F with six perpendicular reinforcing blades was the best arrangement. In this case, the displacement and displacement rate of the plate relative to the base case (without any blades) were reduced by 40% and 64%, respectively.

Keywords: explosive loads; water environment; fluid-structure interaction; reinforcing blades; numerical simulation.

DOI: 10.1504/PCFD.2021.10036930

Progress in Computational Fluid Dynamics, An International Journal, 2021 Vol.21 No.3, pp.170 - 185

Received: 26 Sep 2019
Accepted: 20 May 2020

Published online: 19 May 2021 *

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