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Research
The wind blows where it wills, and you hear the sound of it, but you do not know where it comes from and where it goes;
-- John 3:8 a
Two-dimensional Turbulence:
The majority of fluid flows in nature and engineering applications are turbulent. Turbulent flows are distinct because they display a characteristic cascade of energy. We use a thin-layer electromagnetic flow device to study two-dimensional turbulence.
With the help of filter space techniques (FST) and a geometric perception of the turbulence cascade, we defined the efficiency of turbulence cascades. Moreover, my work revealed the missing piece in the well-known ''thinning mechanism".
Currently, we are taking initiative steps of utilizing spatio-temporal data mining techniques to understand the Lagrangian nature of turbulent flows.
Transport of non-spherical swimmers in turbulent flows:
The majority of fluid flows in nature and engineering applications are turbulent. Turbulent flows are distinct because they display a characteristic cascade of energy. We use a thin-layer electromagnetic flow device to study two-dimensional turbulence.
With the help of filter space techniques (FST) and a geometric description of the turbulence cascade, we defined the efficiency of turbulence cascades. Moreover, my work revealed the missing piece in the well-known ''thinning mechanism".
Currently, we are taking initiative steps of utilizing spatio-temporal data mining techniques to understand the Lagrangian nature of turbulent flows.
*This work is supported by NSF.
Biologically generated ocean mixing
Million of small organisms, paddling fluid, form dense aggregation. Can swimming organisms actually achieve significant mixing? We are using experimental methods to study this question.
To tackle this many-body and multi-scale fluid-structure interaction problem, we are developing a novel particle tracking technique that can access length scales that is one order of magnitude larger than traditional methods. In addition, we will use a recently developed mathematical tool for understanding spectral energy transfer in such interaction.
Settling and transport of atmospheric microplastics (MP)
Coastal areas are notable contributors to the release of atmospheric microplastics (MP) - tiny plastic particles smaller than 5 mm. Sea sprays introduce these MPs to turbulent atmospheric boundary layers, while wind shear can lift plastic debris from beaches into the air. While MP research in aqueous environments has around 20 years of history, their atmospheric dynamics are relatively less explored.
To bridge this gap, I have built a state-of-the-art air chamber integrated with a high-speed three-dimensional particle tracking velocimetry system, designed to probe the intricacies of atmospheric MP. This advanced system as well as the corresponding in-house code boasts the capability to gauge turbulent flows with a Taylor Reynolds number reaching up to 1,000.
Measuring and Simulating Social-distanced Crowds
Modeling a social-distanced crowd is of great importance because social distancing is one of the promising ways of reducing disease transmission during pandemic, post-pandemic, and flu season. Within a social-distanced crowd, individuals move and maneuver with an additional deliberate intention of keeping a minimum safety distance from their neighbors, which can lead to fundamentally unique behaviors. Moreover, the extra "buffer" space around the individuals imposes significant constrain on transportation mobility.
We are facing a situation where we do not have means that would help us to assess, estimate, and model operations of walking crowds in the new reality of corona-impacted conditions. Our group is using both agent-based modeling and advanced computer vision techniques to tackle this issue.
*This work is supported by U.S. Army.
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