Zobrazeno 1 - 10
of 132
pro vyhledávání: '"Childress, Stephen"'
Autor:
Nguyen, Quynh M., Oza, Anand U., Abouezzi, Joanna, Sun, Guanhua, Childress, Stephen, Frederick, Christina, Ristroph, Leif
Publikováno v:
Physical Review Letters 126, 114501 (2021)
We demonstrate flow rectification, valveless pumping or AC-to-DC conversion in macroscale fluidic networks with loops. Inspired by the unique anatomy of bird lungs and the phenomenon of directed airflow throughout the respiration cycle, we hypothesiz
Externí odkaz:
http://arxiv.org/abs/2103.11237
Autor:
Childress, Stephen, Gilbert, Andrew G.
This paper develops a simple model of the inertial range of turbulent flow, based on a cascade of vortical filaments. A binary branching structure is proposed, involving the splitting of filaments at each step into pairs of daughter filaments with di
Externí odkaz:
http://arxiv.org/abs/1911.03537
Autor:
Childress, Stephen, Gilbert, Andrew D.
A theory of an eroding "hairpin" vortex dipole structure in three dimensions is developed, extending our previous study of an axisymmetric eroding dipole without swirl. The hairpin is here similarly proposed as a model to produce large "self-stretchi
Externí odkaz:
http://arxiv.org/abs/1612.07709
A review of analyses based upon anti-parallel vortex structures suggests that structurally stable vortex structures with eroding circulation may offer a path to the study of rapid vorticity growth in solutions of Euler's equations in $ \scriptstyle{\
Externí odkaz:
http://arxiv.org/abs/1512.07898
Autor:
Childress, Stephen
We present a formal, approximate model for singularity formation in classical fluid dynamics in three dimensions. The construction utilizes an approximation of local two-dimensionality to study an anti-parallel hairpin vortex structure with a cross-s
Externí odkaz:
http://arxiv.org/abs/1210.1981
Publikováno v:
Journal of Fluid Mechanics 669, 167-177, 2011
We analyse a simple 'Stokesian squirmer' model for the enhanced mixing due to swimming micro-organisms. The model is based on a calculation of Thiffeault & Childress [Physics Letters A, 374, 3487 (2010), arXiv:0911.5511], where fluid particle displac
Externí odkaz:
http://arxiv.org/abs/1007.1740
Publikováno v:
Physics Letters A 374, 3487-3490 (2010)
We consider the stirring of an inviscid fluid caused by the locomotion of bodies through it. The swimmers are approximated by non-interacting cylinders or spheres moving steadily along straight lines. We find the displacement of fluid particles cause
Externí odkaz:
http://arxiv.org/abs/0911.5511
The fluid dynamics video shows rigid, spatially asymmetric bodies interacting with oscillating background flows. A free rigid object, here a hollow "pyramid," can hover quite stably against gravity in the oscillating airflow with a zero mean, when it
Externí odkaz:
http://arxiv.org/abs/0910.3247