Twisting Rolls. An Heuristic Model and 3D Numerical Simulations of Vortex Patterns
Abstract
Description
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.
9 pages, 5 figures (graphics, Poincare map, photos...). An extended version of a contribution (poster : EAE03-A-01876) to the Joint Assembly of the European Geophysical Society, American Geophysical Union and European Union of Geosciences, Nice, France, 06-11 April 2003.(revision v3)
9 pages, 5 figures (graphics, Poincare map, photos...). An extended version of a contribution (poster : EAE03-A-01876) to the Joint Assembly of the European Geophysical Society, American Geophysical Union and European Union of Geosciences, Nice, France, 06-11 April 2003.(revision v3)