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Modified Immersed Finite Element Method For Fully-Coupled Fluid-Structure Interations.

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  • 1JEC 2049, Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180.

Computer Methods in Applied Mechanics and Engineering
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Summary
This summary is machine-generated.

A modified immersed finite element method (mIFEM) improves fluid-structure interaction simulations by accurately solving solid dynamics. This new approach prevents mesh distortion common in high Reynolds number flows, offering realistic coupled solutions.

Keywords:
Immersed Finite Element Methodcompressibilityfluid-structure interaction

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Area of Science:

  • Computational fluid dynamics
  • Solid mechanics
  • Numerical analysis

Background:

  • Fluid-structure interactions (FSI) are critical in many engineering applications.
  • Traditional immersed finite element methods (IFEM) can suffer from significant solid mesh distortion, especially in high Reynolds number flows.
  • Overestimation of solid deformation in IFEM leads to inaccurate coupled solutions.

Purpose of the Study:

  • To introduce a modified immersed finite element method (mIFEM) for enhanced FSI simulations.
  • To address the limitations of the original IFEM in accurately capturing solid dynamics.
  • To achieve more precise and realistic simulations of complex FSI phenomena.

Main Methods:

  • Development of a non-boundary-fitted numerical technique, the mIFEM.
  • Solving the solid governing equation directly within the mIFEM framework.
  • Generating appropriate boundary conditions from the surrounding fluid to drive solid dynamics.

Main Results:

  • The mIFEM precisely captures solid dynamics by solving its governing equation.
  • This method avoids the overestimation of solid deformation seen in original IFEM.
  • Demonstrated advantage of mIFEM in 2-D and 3-D cases with dominant solid behavior.

Conclusions:

  • The mIFEM offers a significant improvement over traditional IFEM for FSI problems.
  • Accurate simulation of solid dynamics leads to more realistic and reliable coupled solutions.
  • mIFEM is particularly advantageous for complex FSI scenarios where solid behavior is dominant.