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A robust algorithm for computational floating body dynamics.

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This summary is machine-generated.

FloatStepper is a new algorithm for computational fluid dynamics (CFD) simulations that solves the added mass instability problem in floating body interactions. It enables stable simulations even for massless bodies.

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Area of Science:

  • Computational Fluid Dynamics (CFD)
  • Fluid-Structure Interaction
  • Numerical Methods

Background:

  • Added mass instability is a common issue in CFD simulations involving light bodies interacting with dense fluids.
  • Existing methods for coupling rigid body motion and fluid dynamics can be computationally expensive or unstable.

Purpose of the Study:

  • To introduce FloatStepper, a novel non-iterative algorithm for stable coupling of rigid body motion and incompressible fluid flow.
  • To address and eliminate the added mass instability problem in CFD simulations.

Main Methods:

  • Developed a non-iterative algorithm, FloatStepper, for rigid body and incompressible fluid coupling.
  • Implemented a probe body motion strategy to decompose forces and torques.
  • Integrated the algorithm as an open-source extension for OpenFOAM.

Main Results:

  • Demonstrated excellent stability properties across various single-phase and two-phase flow benchmark cases.
  • Successfully enabled simulations with massless bodies, showcasing robustness.
  • Identified areas for improvement in mesh motion for enhanced flexibility and predictive power.

Conclusions:

  • FloatStepper offers a stable and efficient alternative for simulating fluid-body interactions in CFD.
  • The open-source implementation facilitates wider adoption and further development.
  • Further refinements in mesh motion can expand the algorithm's applicability.