The rise of fully turbulent flow

• Autores: Dwight Barkley, Baofang Song, Vasudevan Mukund, Grégoire Lemoult, Marc Avila, Björn Hof
• Localización: Nature: International weekly journal of science, ISSN 0028-0836, Vol. 526, Nº 7574, 2015, págs. 550-553
• Idioma: inglés
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• Resumen

  • Over a century of research into the origin of turbulence in wall-bounded shear flows has resulted in a puzzling picture in which turbulence appears in a variety of different states competing with laminar background flow1,2,3,4,5,6. At moderate flow speeds, turbulence is confined to localized patches; it is only at higher speeds that the entire flow becomes turbulent. The origin of the different states encountered during this transition, the front dynamics of the turbulent regions and the transformation to full turbulence have yet to be explained. By combining experiments, theory and computer simulations, here we uncover a bifurcation scenario that explains the transformation to fully turbulent pipe flow and describe the front dynamics of the different states encountered in the process. Key to resolving this problem is the interpretation of the flow as a bistable system with nonlinear propagation (advection) of turbulent fronts. These findings bridge the gap between our understanding of the onset of turbulence7 and fully turbulent flows8,9.