Turbulence generation supported by an inverse energy transfer through a zig-zag pattern.

Area of Science:

• Fluid Dynamics
• Turbulence Research

Background:

• Turbulent flow exhibits vortices across scales, with energy transfer typically modeled as a cascade from large to small scales.
• The established model describes energy dissipation at small scales via viscosity, but the exact mechanism of energy transfer remains debated.

Purpose of the Study:

• To investigate an alternative mechanism for the emergence of turbulent energy spectra.
• To identify flow structures responsible for generating turbulence from initial conditions.

Main Methods:

• Utilized computer simulations to model turbulent flow development.
• Employed stability analysis to support simulation findings.

Main Results:

• Observed turbulent energy spectra emerging first at small scales and extending to larger scales.
• Identified the formation of vortex filaments and their zig-zag rearrangement as key structures.
• Hypothesized an inverse energy transfer from small to large scales driven by these patterns.

Conclusions:

• Presents a novel model of turbulence generation, challenging the traditional forward energy cascade.
• Suggests that vortex filament formation and rearrangement play a crucial role in developing turbulent energy spectra.
• Findings have broad implications for understanding fluid flow in diverse applications, including biomedical, engineering, and atmospheric sciences.