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Fixed-Point Fluid structure interaction analysis BASED ON geometrically exact approach.

Mingliang Yu1, Xueyuan Nie2, Guowei Yang1

  • 1Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics,Chinese Academy of Sciences, Beijing, 100190, China.

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|June 27, 2020
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Summary
This summary is machine-generated.

This study presents an efficient and robust fluid-structure interaction (FSI) method for large deformations. The approach accurately simulates flexible beams and wing flutter using a strong coupling method with accelerated convergence.

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Area of Science:

  • Computational mechanics
  • Fluid-structure interaction (FSI)
  • Nonlinear dynamics

Background:

  • Analyzing fluid-structure interaction (FSI) in large deformation scenarios presents computational challenges.
  • Existing methods may struggle with accuracy and convergence for highly nonlinear systems.

Purpose of the Study:

  • To develop and validate a robust strong coupling method for FSI analysis of structures with large deformations.
  • To enhance computational efficiency and accuracy in simulating complex fluid-structure dynamics.

Main Methods:

  • Employed a strong coupling approach with a fixed-point method accelerated by Aitken's dynamic relaxation for coupling iterations.
  • Utilized a geometrically exact beam theory for nonlinear flexible beam modeling.
  • Implemented an improved implicit time integration algorithm for enhanced structural dynamics accuracy.

Main Results:

  • The proposed method demonstrated high efficiency and robustness in fluid-structure interaction computations.
  • Validation through flutter analysis of the AGARD 445.6 wing in the transonic regime confirmed the fixed-point method's applicability to compressible flows.
  • Successful simulation of flow-induced vibration in a flexible beam validated the geometrically exact beam theory for FSI.

Conclusions:

  • The geometrically exact beam theory-based approach is well-suited for fluid-structure interaction analysis.
  • The fixed-point method with Aitken's relaxation offers significant efficiency and robustness for FSI computations.