210 citations · 733 across the 34 of their papers we have counts for
27 papers · 1 filter
Buoyancy-dependent induced flow by vertically migrating swimmers
Nina Mohebbi, John O. Dabiri
Collective vertical swimming may generate aggregate-scale flows that contribute to mixing and transport in stratified environments. The strength of these flows depends not only on…
Visual anemometry of natural vegetation from their leaf motion
Roni H. Goldshmid, John O. Dabiri, John E. Sader
High-resolution, near-ground wind-speed data are critical for improving the accuracy of weather predictions and climate models, supporting wildfire control efforts,…
A model for Reynolds-dependent linear instability in wall-bounded shear flows
John O. Dabiri, Anthony Leonard
Recent work demonstrated that alternative models to the "no-slip" boundary condition for incipient flow perturbations can produce linear instabilities that do not arise in the clas…
Surfing vortex rings for energy-efficient propulsion
Peter Gunnarson, John O. Dabiri
Leveraging background fluid flows for propulsion has the potential to enhance the range and speed of autonomous aerial and underwater vehicles. In this work, we demonstrate experim…
Wake dynamics of wind turbines in unsteady streamwise flow conditions
Nathaniel J. Wei, Adnan El Makdah, JiaCheng Hu +3
The unsteady flow physics of wind-turbine wakes under dynamic forcing conditions are critical to the modeling and control of wind farms for optimal power density. Unsteady forcing…
Fish-inspired tracking of underwater turbulent plumes
Peter Gunnarson, John O. Dabiri
Autonomous ocean-exploring vehicles have begun to take advantage of onboard sensor measurements of water properties such as salinity and temperature to locate oceanic features in r…
Measurements and modelling of induced flow in collective vertical migration
Nina Mohebbi, Joonha Hwang, Matthew K. Fu +1
Hydrodynamic interactions between swimming or flying organisms can lead to complex flows on the scale of the group. These emergent fluid dynamics are often more complex than a line…
Do swimming animals mix the ocean?
John O. Dabiri
The world's oceans are in constant motion, transporting the sun's heat from the equator to the poles, bringing marine life fresh supplies of oxygen and nutrients, and sequestering…
Linear instability of viscous parallel shear flows: revisiting the perturbation no-slip condition
John O. Dabiri, Anthony Leonard
Linear stability analysis currently fails to predict turbulence transition in canonical viscous flows. We show that two alternative models of the boundary condition for incipient p…
Visual anemometry: physics-informed inference of wind for renewable energy, urban sustainability, and environmental science
John O. Dabiri, Michael F. Howland, Matthew K. Fu +1
Accurate measurements of atmospheric flows at meter-scale resolution are essential for a broad range of sustainability applications, including optimal design of wind and solar farm…
Persistent Laminar Flow at Reynolds Numbers Exceeding 100,000
John O. Dabiri, Nina Mohebbi, Matthew K. Fu
Accurate prediction of the transition from laminar flow to turbulence remains an unresolved challenge despite its importance for understanding a variety of environmental, biologica…
Power-generation enhancements and upstream flow properties of turbines in unsteady inflow conditions
Nathaniel J. Wei, John O. Dabiri
Energy-harvesting systems in complex flow environments, such as floating offshore wind turbines, tidal turbines, and ground-fixed turbines in axial gusts, encounter unsteady stream…
Physical constraints on visual anemometry using vegetation displacement statistics
Roni H. Goldshmid, John O. Dabiri
Visual anemometry (VA) leverages observations of fluid-structure interactions to infer incident flow characteristics. Recent work has demonstrated the concept of VA using both data…
Phase-Averaged Dynamics of a Periodically Surging Wind Turbine
Nathaniel J. Wei, John O. Dabiri
The unsteady power generation of a wind turbine translating in the streamwise direction is relevant to floating offshore wind turbines, kite-mounted airborne wind turbines, and oth…
Wind speed inference from environmental flow-structure interactions, part 2: leveraging unsteady kinematics
Jennifer L. Cardona, John O. Dabiri
This work explores the relationship between wind speed and time-dependent structural motion response as a means of leveraging the rich information visible in flow-structure interac…
Learning Efficient Navigation in Vortical Flow Fields
Peter Gunnarson, Ioannis Mandralis, Guido Novati +2
Efficient point-to-point navigation in the presence of a background flow field is important for robotic applications such as ocean surveying. In such applications, robots may only…
A single-camera, 3D scanning velocimetry system for quantifying active particle aggregations
Matt K. Fu, Isabel A. Houghton, John O. Dabiri
A three-dimensional (3D) scanning velocimetry system is developed to quantify the 3D configurations of particles and their surrounding volumetric, three-component velocity fields.…
Wind speed inference from environmental flow-structure interactions
Jennifer L. Cardona, Katherine L. Bouman, John O. Dabiri
This study aims to leverage the relationship between fluid dynamic loading and resulting structural deformation to infer the incident flow speed from measurements of time-dependent…
Theoretical framework to surpass the Betz limit using unsteady fluid mechanics
John O. Dabiri
The Betz limit expresses the maximum proportion of the kinetic energy flux incident on an energy conversion device that can be extracted from an unbounded flow. The derivation of t…
Near-wake structure of full-scale vertical-axis wind turbines
Nathaniel J. Wei, Ian D. Brownstein, Jennifer L. Cardona +2
To design and optimize arrays of vertical-axis wind turbines (VAWTs) for maximal power density and minimal wake losses, a careful consideration of the inherently three-dimensional…
Landmarks and Frontiers in Biological Fluid Dynamics
John O. Dabiri
Biological systems are influenced by fluid mechanics at nearly all spatiotemporal scales. This broad relevance of fluid mechanics to biology has been increasingly appreciated by en…
Model parameter estimation using coherent structure coloring
Kristy L. Schlueter-Kuck, John O. Dabiri
Lagrangian data assimilation is a complex problem in oceanic and atmospheric modeling. Tracking drifters in large-scale geophysical flows can involve uncertainty in drifter locatio…
Identification of individual coherent sets associated with flow trajectories using Coherent Structure Coloring
Kristy L. Schlueter-Kuck, John O. Dabiri
We present a method for identifying the coherent structures associated with individual Lagrangian flow trajectories even where only sparse particle trajectory data is available. Th…
Coherent structure coloring: identification of coherent structures from sparse data using graph theory
Kristy L. Schlueter-Kuck, John O. Dabiri
We present a frame-invariant method for detecting coherent structures from Lagrangian flow trajectories that can be sparse in number, as is the case in many fluid mechanics applica…