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Energy-decomposition analysis for viscous free-surface flows.

Andrea Colagrossi1, Benjamin Bouscasse2, Salvatore Marrone3

  • 1CNR-INSEAN, Marine Technology Research Institute, Rome, Italy.

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Summary
This summary is machine-generated.

This study analyzes viscous free-surface flow energy dissipation. The free-surface deformation component is generally dominant, but comparable to enstrophy during intense breaking wave phenomena.

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Area of Science:

  • Fluid Dynamics
  • Computational Physics
  • Energy Analysis

Background:

  • Viscous dissipation in free-surface flows is complex.
  • Understanding energy partitioning is crucial for accurate simulations.
  • Previous analyses often simplified free-surface effects.

Purpose of the Study:

  • To decompose viscous dissipation in Newtonian free-surface flows.
  • To investigate the contributions of enstrophy and free-surface deformation.
  • To analyze energy behavior under varying conditions and complex scenarios.

Main Methods:

  • Energy decomposition analysis.
  • Weakly compressible smoothed particle hydrodynamics (WCSPH) formalism.
  • Meshless evaluation of volume and surface integrals.

Main Results:

  • Viscous dissipation decomposes into enstrophy and free-surface deformation terms.
  • Free-surface component typically dominates viscous dissipation in gravity waves.
  • Energy components become comparable during intense breaking wave phenomena.

Conclusions:

  • The proposed decomposition provides insight into energy dissipation mechanisms.
  • WCSPH is suitable for analyzing complex free-surface flow energy dynamics.
  • Breaking waves represent a critical regime where energy partitioning shifts significantly.