Session: 02-12-01 Digital Twins of Marine Structures 1

Submission Number: 179591

Proposal of Physics-Based Surrogate for Hydro-Elastoplastic Response of Panel Under Bow Flare Slamming Impact and its Validation 

Slamming impacts on the bow flare of large container ships can cause significant local damage. While high-fidelity computational fluid dynamics (CFD)-finite element method (FEM) coupled simulations can accurately capture such phenomena once the modeling and analysis conditions are appropriately given, their high computational cost makes them impractical for repeated use in early-stage design or risk screening. This study aims to develop a physics-based surrogate model or reduced order model (ROM) that can efficiently estimate the dynamic elastic-plastic response of stiffened panels subjected to slamming loads.
The proposed ROM is based on a 1-DoF model originally proposed by Yankelevsky. The model consists of a mass-spring-damper system, in which the spring element is modeled by a bilinear elastic-plastic constitutive law. Time-varying slamming pressure history models, obtained from CFD simulation results, are applied as external forces. The model captures the dynamic response, followed by plastic deformation, and includes the effect of in-plane membrane forces that suppress transverse deformation. The hydro-elastoplastic response of a panel is calculated by numerically integrating the equation of motion. The ROM is validated by comparison with results from CFD–FEM coupled simulations using LS-DYNA, which has been validated for hydroelastic responses in prior studies. Based on the observed discrepancies, modeling assumptions are examined, and improvements are considered.
The results show that the ROM is able to capture the essential features of the panel response while achieving a reasonable balance between computational efficiency and accuracy, suggesting its potential as a practical tool for estimating slamming-induced structural effects in ship design.
 

Presenting Author: Binyang Xie The University of Osaka

Presenting Author Biography: Binyang XIE is an assistant professor at the Department of Naval Architecture and Ocean Engineering of the University of Osaka. His research focuses on the CFD-FEA coupled technique, hydroelasticity, and digital-twin, with the recent work on the reduced-order model (ROM) for elastoplastic slamming responses. This presentation proposed and validated a physics-based surrogate for the hydro-elastoplastic response of a panel under bow flare slamming impact.

Authors:

Binyang Xie The University of Osaka
Gyoshu Li The University of Osaka
Kei Sugimoto Nippon Kaiji Kyokai
Kazuhiro Iijima The University of Osaka