Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Ristroph, Leif"'
Autor:
Pomerenk, Olivia, Ristroph, Leif
The passive flight of a thin wing or plate is an archetypal problem in flow-structure interactions at intermediate Reynolds numbers. This seemingly simple aerodynamic system displays an impressive variety of steady and unsteady motions that are famil
Externí odkaz:
http://arxiv.org/abs/2408.08864
We report on the shape dynamics of ice suspended in cold fresh water and subject to the natural convective flows generated during melting. Experiments reveal shape motifs for increasing far-field temperature: Sharp pinnacles directed downward at low
Externí odkaz:
http://arxiv.org/abs/2111.09937
Publikováno v:
Nat Commun 12, 2884 (2021)
Microfluidics has enabled a revolution in the manipulation of small volumes of fluids. Controlling flows at larger scales and faster rates, or $\textit{macrofluidics}$, has broad applications but involves the unique complexities of inertial flow phys
Externí odkaz:
http://arxiv.org/abs/2103.17222
Autor:
Nguyen, Quynh M., Huang, Dean, Zauderer, Evan, Romanelli, Genevieve, Meyer, Charlotte L., Ristroph, Leif
Publikováno v:
American Journal of Physics 89.4 (2021): 393-402
Reasoning by analogy is powerful in physics for students and researchers alike, a case in point being electronics and hydraulics as analogous studies of electric currents and fluid flows. Around 100 years ago, Nikola Tesla proposed a flow control dev
Externí odkaz:
http://arxiv.org/abs/2103.14813
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:
Brosseau, Quentin, Usabiaga, Florencio Balboa, Lushi, Enkeleida, Wu, Yang, Ristroph, Leif, Ward, Michael D., Shelley, Michael J., Zhang, Jun
As a natural and functional behavior, various microorganisms exhibit gravitaxis by orienting and swimming upwards against gravity. Swimming autophoretic nanomotors described herein, comprising bimetallic nanorods, preferentially orient upwards and sw
Externí odkaz:
http://arxiv.org/abs/2008.05273
Autor:
Brosseau, Quentin, Usabiaga, Florencio Balboa, Lushi, Enkeleida, Wu, Yang, Ristroph, Leif, Zhang, Jun, Ward, Michael, Shelley, Michael J.
Publikováno v:
Phys. Rev. Lett. 123, 178004 (2019)
We explore the behavior of micron-scale autophoretic Janus (Au/Pt) rods, having various Au/Pt length ratios, swimming near a wall in an imposed background flow. We find that their ability to robustly orient and move upstream, i.e. to rheotax, depends
Externí odkaz:
http://arxiv.org/abs/1906.04814
Publikováno v:
Phys. Rev. X 9, 041024 (2019)
Fish schools and bird flocks exhibit complex collective dynamics whose self-organization principles are largely unknown. The influence of hydrodynamics on such collectives has been relatively unexplored theoretically, in part due to the difficulty in
Externí odkaz:
http://arxiv.org/abs/1904.13045
We explore the rotational stability of hovering flight. Our model is motivated by an experimental pyramid-shaped object and a computational lambda-shaped analog hovering passively in oscillating airflows; both systems have been shown to maintain rota
Externí odkaz:
http://arxiv.org/abs/1709.09241
Autor:
Wykes, Megan S. Davies, Zhong, Xiao, Tong, Jiajun, Adachi, Takuji, Liu, Yanpeng, Ristroph, Leif, Ward, Michael D., Shelley, Michael J., Zhang, Jun
The swimming direction of biological or artificial microscale swimmers tends to be randomised over long time-scales by thermal fluctuations. Bacteria use various strategies to bias swimming behaviour and achieve directed motion against a flow, mainta
Externí odkaz:
http://arxiv.org/abs/1701.08410