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Related Experiment Videos

Motion of defects in rotating fluids.

Juan Millan-Rodriguez1, Carlos Perez-Garcia, Michael Bestehorn

  • 1Departamento de Fisica y Matematica Aplicada, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Navarra, SpainInstitut fur Theoretische Physik und Synergetik der Universitat Stuttgart, Pfaffenwaldring 57/4, 70550 Stuttgart, Germany.

Chaos (Woodbury, N.Y.)
|June 1, 1994
PubMed
Summary

We investigated defect motion in rotating convection cells. Slow rotation induces defect movement perpendicular to convective rolls, even below instability thresholds.

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Area of Science:

  • Fluid dynamics
  • Hydrodynamics
  • Nonlinear dynamics

Background:

  • Convection cells exhibit complex dynamics, including defect motion.
  • Rotation introduces Coriolis forces, significantly altering fluid behavior.
  • Non-Boussinesq effects further complicate the system's response.

Purpose of the Study:

  • To model and analyze defect motion in a rotating convection cell.
  • To investigate the impact of Coriolis forces and non-Boussinesq effects on defect dynamics.
  • To derive an analytical estimation for the observed defect motion.

Main Methods:

  • Numerical simulations using a generalized Swift-Hohenberg equation.
  • Modeling vertically averaged three-dimensional hydrodynamic equations.

Related Experiment Videos

  • Incorporating non-Boussinesq effects and Coriolis forces due to rotation.

    • Main Results:

    • Defect motion was observed perpendicular to convective rolls, even at slow rotation speeds.
    • This motion occurs below the Kuppers-Lortz instability threshold.
    • An analytical estimation for this defect motion was successfully derived.

    Conclusions:

    • Rotation, even weak, fundamentally alters defect motion in convection cells.
    • The generalized Swift-Hohenberg equation effectively captures these complex dynamics.
    • The findings provide insights into pattern formation and defect behavior in rotating fluids.