171 citations · 661 across the 15 of their papers we have counts for
16 papers
Quasi-steady aerodynamics predicts the dynamics of flapping locomotion
Olivia Pomerenk, Leif Ristroph
The propulsion of a flapping wing or foil is emblematic of bird flight and fish swimming. Previous studies have identified hallmarks of the propulsive dynamics that have been attri…
Modeling flying formations as flow-mediated matter
Christiana Mavroyiakoumou, Jiajie Wu, Leif Ristroph
Collective locomotion of swimming and flying animals is fascinating in terms of individual-level fluid mechanics and group-level structure and dynamics. Here we bridge and relate t…
Flow interactions and forward flight dynamics of tandem flapping wings
Fang Fang, Christiana Mavroyiakoumou, Leif Ristroph +1
We examine theoretically the flow interactions and forward flight dynamics of tandem or in-line flapping wings. Two wings are driven vertically with prescribed heaving-and-plunging…
Aerodynamic equilibria and flight stability of plates at intermediate Reynolds numbers
Olivia Pomerenk, Leif Ristroph
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 displa…
Anomalous convective flows carve pinnacles and scallops in melting ice
Scott Weady, Joshua Tong, Alexandra Zidovska +1
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 incre…
Tesla's fluidic diode and the electronic-hydraulic analogy
Quynh M. Nguyen, Dean Huang, Evan Zauderer +3
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…
Flow rectification in loopy network models of bird lungs
Quynh M. Nguyen, Anand U. Oza, Joanna Abouezzi +4
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 phenomen…
Early turbulence and pulsatile flows enhance diodicity of Tesla's macrofluidic valve
Quynh M. Nguyen, Joanna Abouezzi, Leif Ristroph
Microfluidics has enabled a revolution in the manipulation of small volumes of fluids. Controlling flows at larger scales and faster rates, or , has broad a…
Metallic Microswimmers Driven up the Wall by Gravity
Quentin Brosseau, Florencio Balboa Usabiaga, Enkeleida Lushi +5
As a natural and functional behavior, various microorganisms exhibit gravitaxis by orienting and swimming upwards against gravity. Swimming autophoretic nanomotors described herein…
Relating microswimmer synthesis to rheotactic tunability
Quentin Brosseau, Florencio Balboa Usabiaga, Enkeleida Lushi +5
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…
Lattices of hydrodynamically interacting flapping swimmers
Anand U. Oza, Leif Ristroph, Michael J. Shelley
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…
Bistability in the rotational motion of rigid and flexible flyers
Yangyang Huang, Leif Ristroph, Mitul Luhar +1
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…
Guiding microscale swimmers using teardrop-shaped posts
Megan S. Davies Wykes, Xiao Zhong, Jiajun Tong +6
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…
Dynamic self-assembly of microscale rotors and swimmers
Megan S. Davies Wykes, Jeremie Palacci, Takuji Adachi +5
Biological systems often involve the self-assembly of basic components into complex and function- ing structures. Artificial systems that mimic such processes can provide a well-co…
Fruit flies modulate passive wing pitching to generate in-flight turns
Attila J. Bergou, Leif Ristroph, John Guckenheimer +2
Flying insects execute aerial maneuvers through subtle manipulations of their wing motions. Here, we measure the free flight kinematics of fruit flies and determine how they modula…
Fjords in viscous fingering: Selection of width and opening angle
Leif Ristroph, Matthew Thrasher, Mark B. Mineev-Weinstein +1
Our experiments on viscous fingering of air into oil contained between closely spaced plates reveal two selection rules for the fjords of oil that separate fingers of air. (Fjords…