Iterative improved reduced system method of fluid-structure interaction with free surface

Kang Heon Lee, Seongmin Chang, Jin Gyun Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The aim of this study is to develop an iterative improved reduced system method for the model reduction of the fluid-structure interaction with free surface. The fluid-structure interaction with incompressible fluid for the interior fluid-structure problem involving a free surface without capillarity effects and a linear elastic structure is analyzed. The present study addresses a well-known asymmetric formulation that comprises structural displacement, fluid pressure of the free surface, and fluid pressure of the interior fluid. In this study, the formulation is reduced in a condensation manner, which is degree of freedom based reduced-order modeling. In particular, the proposed iterative scheme considers inertia terms and its equivalent transformation, thereby yielding a reduced model that more accurately reflects the features of the fully coupled system. The performance and convergence of this formulation are evaluated through numerical examples.

Original languageEnglish
Article number116445
JournalJournal of Sound and Vibration
Publication statusPublished - 8 Dec 2021


  • Condensation
  • Fluid-structure interaction
  • Free surface
  • Iterative method
  • Reduced-order modeling


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