Journal article
A non-intrusive nonlinear structural ROM for partitioned two-way fluid-structure interaction computations
Computer methods in applied mechanics and engineering, Vol.437, 117736
03/2025
DOI: 10.1016/j.cma.2025.117736
Abstract
This paper introduces a nonlinear structural reduced order model (ROM) specifically developed for fluid–structure interaction (FSI) simulations involving high impact loads and large deflections, such as those arising in water slamming of flexible structures. The model is based on a nonlinear modal expansion trained offline using prestressed eigenfrequency analyses performed by nonlinear full-order computational structural dynamics based on finite elements. The training uses the eigenfrequencies as a function of the deflection and is non-intrusive, which means that the knowledge of the system’s full-order matrices is not required. Eigenfrequencies and deflections are evaluated under a prescribed set of static loads, which are derived from fully transient computational fluid dynamics (CFD) simulations. The resulting ROM is coupled with CFD using partitioned one- and two-way FSI schemes. Focusing on the impact of an elastic aluminum plate onto still water, the research investigates scenarios with varied horizontal and vertical velocities in three distinct experimental conditions, which cover moderate to strong hydroelastic interactions. Namely, the proposed nonlinear ROM and its linear counterpart are tested against two FSI benchmark sets. The first set consists in comparing the ROM versus the full-order model (FOM) under prescribed external load, via one-way FSI coupling. The second set consists in comparing the ROM versus experimental data, via two-way tightly-coupled FSI. Comparisons of the nonlinear ROM versus the FOM under prescribed loads achieve an average error equal to 2.7%. Comparisons of the nonlinear ROM under two-way tightly-coupled FSI versus experiments show an average error equal to 4.5%. Comparisons of nonlinear versus linear ROM highlight the need for nonlinear models to accurately capture peak values and trends, especially in scenarios with large deflections.
Details
- Title: Subtitle
- A non-intrusive nonlinear structural ROM for partitioned two-way fluid-structure interaction computations
- Creators
- Riccardo Pellegrini - Institute of Marine EngineeringZhaoyuan Wang - University of IowaFrederick Stern - University of IowaMatteo Diez - Institute of Marine Engineering
- Resource Type
- Journal article
- Publication Details
- Computer methods in applied mechanics and engineering, Vol.437, 117736
- DOI
- 10.1016/j.cma.2025.117736
- ISSN
- 0045-7825
- eISSN
- 1879-2138
- Publisher
- Elsevier B.V
- Grant note
- Office of Naval Research, Ship Systems and Engineering Research Division: 331, N00014-20-1-2259, N00014-22-1-2413 CNR-INM project ATOM
Funding for this work is provided by the Office of Naval Research, Ship Systems and Engineering Research Division (Code 331) , under the direction of Dr. Robert Brizzolara, Grants N00014-20-1-2259 and N00014-22-1-2413. Dr. Riccardo Pellegrini is partially supported through CNR-INM project ATOM. The authors are grateful to J. H. Duncan, K. T. Kiger, A. Wang, M. Yu, and S. Lee of the Department of Mechanical Engineering of the University of Maryland for providing the experimental data and the fruitful discussions on the physics of flexible plate slamming. The simulations presented in this work were performed at the Department of Defense (DoD) Supercomputing Resource Centers (DSRCs) through the High Performance Computing Modernization Program (HPCMP) .
- Language
- English
- Date published
- 03/2025
- Academic Unit
- IIHR--Hydroscience and Engineering; Mechanical Engineering
- Record Identifier
- 9984781276402771
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