Twisting Rolls. An Heuristic Model and 3D Numerical Simulations of Vortex Patterns

Details Twisting Rolls. An Heuristic Model and 3D Numerical Simulations of Vortex Patterns Twisting Rolls. An Heuristic Model and 3D Numerical Simulations of Vortex Patterns

2003-06-02

arxiv.org/abs/physics/0306001v2

Physics

Fluid Dynamics

9 pages, 5 figures (graphics, Poincare map, photos...). An extended version of a contribution (poster : EAE03-A-01876) to the

Scientific paper

We connect an appropriate feedback loop to a model of 2D vertical eddy of airflow which unfolds a wide range of vorticity behavior. Computational fluid dynamics of the twisted roll display a class of long lifespan 3D vortices. On the one hand, the infinitely stable columnar vortex simulated describes waterspouts and tornadoes with extended lifetime. On the other hand, a light modification of the retroaction exhibits strong similarities to tropical cyclones. Moreover, we investigate the outcome of the twisting process vertically shifted. This modelisation leads to the simulation of simultaneous vortices associated to this other class of 3D vortices with short lifespan. Our heuristic dynamical systems lay the foundations of a comprehensive modelisation of vortices since it joins theory and numerical simulations.

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