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Papers
61,005 resultsShowing papers similar to Direct numerical simulation of the distribution of floating microplastic particles in an open channel flow
ClearPlastic drift : Mapping the course of microplastic transport in turbulent riverine flows.
Researchers conducted laboratory experiments tracking the 3D trajectories of 24 negatively buoyant microplastic particles spanning a range of sizes, shapes, and densities in turbulent open channel flow, generating 720 trajectories to evaluate how well conventional sediment transport models apply to microplastics. Results revealed that the inherent variability in microplastic physical properties challenges direct application of sediment transport concepts to microplastic fate prediction in rivers.
A Lagrangian Model for Microplastics Transport in Rivers
Researchers developed a Lagrangian computational model to simulate how microplastics are transported through river systems, accounting for particle buoyancy, turbulence, and settling behavior. The model provides a tool for predicting microplastic fate and accumulation in freshwater environments.
Computational Analysis of Microplastics Hydrodynamics in Laboratory Experiment
Researchers conducted computational simulations of microplastic hydrodynamics in an open channel using OpenFOAM with turbulent flow modelling, validating the simulation against laboratory experimental results and examining how particle properties influence settling behaviour.
Plastic drift : Mapping the course of microplastic transport in turbulent riverine flows.
Researchers investigated the transport dynamics of 24 negatively buoyant microplastic particles across a spectrum of sizes, shapes, and densities using a 3D particle tracking system in turbulent open channel flow, generating 720 trajectories. They found that particle shape was the dominant determinant of transport behavior, with fibers tending to remain near the water surface at lower forward velocities while spheres stayed closer to the bed with higher forward velocities.
Modeling the settling and resuspension of microplastics in rivers: Effect of particle properties and flow conditions
Researchers developed a mathematical model to simulate how microplastics of different shapes settle and resuspend in rivers, moving beyond the common assumption that all particles are spherical. They found that turbulence has a complex effect, sometimes keeping particles suspended longer and sometimes accelerating their settling, depending on flow conditions. The model reveals that particle shape significantly influences where microplastics end up in river systems.
Dispersal and transport of microplastic particles under different flow conditions in riverine ecosystem
Researchers developed a particle-tracking model combined with hydrodynamic simulation to study how microplastics travel through river systems under different water flow conditions. They found that flow speed, turbulence, and river channel features significantly influence where microplastics accumulate and how far they travel. The study provides a useful tool for predicting microplastic transport patterns and identifying pollution hotspots in river ecosystems.
Computational Analysis of Microplastics Hydrodynamics
Researchers developed a numerical model in Python and OpenFOAM to simulate microplastic particle dynamics in laminar open-channel flow, finding that particles smaller than 0.5 mm are unlikely to settle regardless of sphericity index, with results validated on a supercomputer.
Factors influencing the vertical distribution and transport of plastics in riverine environments: Theoretical background and implications for improved field study design.
This review examines the physical and hydrodynamic factors governing the vertical distribution and transport of plastics in riverine environments, synthesizing theoretical background on settling velocity, turbulence, and buoyancy to provide recommendations for improved field study design.
Modeling the trajectories of floating and non-floating microplastic particles in the water column
Researchers modeled the trajectories of both floating and non-floating microplastic particles in freshwater and marine water columns, accounting for turbulence-induced mixing, buoyancy differences, and flow characteristics that determine vertical and horizontal distribution. The study highlights that while low-density polymers like polyethylene and polypropylene are expected to concentrate at the surface, turbulent mixing drives significant depth distribution across aquatic environments.
Entrainment and vertical mixing of aquatic microplastics in turbulent flow: The coupled role of particle size and density
Researchers conducted laboratory flume experiments to study how turbulence affects the vertical mixing and entrainment of microplastic particles of different sizes and densities. Both particle size and polymer density significantly influenced mixing behavior, with smaller and denser particles more responsive to turbulent structures, informing models of microplastic transport in rivers and coastal waters.
Coupled CFD-DEM modelling to assess settlement velocity and drag coefficient of microplastics
Researchers used computational fluid dynamics coupled with particle simulations to model how the size, shape, and density of microplastics affect their settling velocity and drag in water. Accurate physical models of microplastic behavior are essential for predicting where particles accumulate in rivers, lakes, and the ocean.
Modelling forces on buoyant macro plastics and their cross-sectional distribution in rivers: Simplified modelling of buoyant macro plastics according to cornerstones in behavior and particle response times in a range of riverine environments to set-up efficient monitoring campaigns and help select locations for efficient plastic removal.
Researchers modeled the forces acting on buoyant plastic debris in rivers to better predict how macroplastics are distributed across river cross-sections, which is important for designing efficient plastic monitoring and collection systems. Understanding plastic transport in rivers is key to tracking how land-based plastics reach the ocean.
Modeling impacts of river hydrodynamics on fate and transport of microplastics in riverine environments
Researchers built a computer model to simulate how microplastics travel and transform in river systems, accounting for particle aggregation and breakage driven by water flow. They found that microplastics clump together significantly in the early stages after entering a river, which changes the size distribution of particles flowing downstream. The study suggests that river conditions play a major role in determining what size and form of microplastics eventually reach the ocean.
On the vertical structure of non-buoyant plastics in turbulent transport
Researchers investigated how non-floating plastic debris moves through river-like flows and found that plastics settle in unique, complex patterns due to their irregular shapes. In low-turbulence conditions, interactions between the plastic particles and the riverbed enhanced mixing beyond what standard sediment transport models would predict. The study proposes a new equation for describing how plastics are distributed vertically in flowing water.
Distribution of Plastics of Various Sizes and Densities in the Global Ocean From a 3D Eulerian Model
Using a three-dimensional Eulerian transport model, researchers simulated global ocean distribution of microplastics across different sizes and densities, finding that particle buoyancy and size strongly govern vertical distribution and that significant MP fractions sink to deeper ocean layers.
Numerical Study of Microplastic Dispersal in Simulated Coastal Waters Using CFD Approach
Researchers used CFD numerical simulations to model microplastic dispersal in simulated coastal waters, investigating how particle type, size, shape, flow velocity, and temperature affect the transport and distribution patterns of PET, PU, and polypropylene microplastics.
Settling velocity of microplastics in turbulent open-channel flow
Researchers studied how microplastic particles settle in turbulent river-like flow conditions compared to still water and developed a new formula to predict their behavior. They found that turbulence altered settling velocities by as much as 26% depending on particle properties, with larger, heavier particles being less influenced by water turbulence. The findings are important for building better models of how microplastics are transported and distributed in rivers and other flowing waterways.
Study of the influence of fluvial dynamics on the distribution and transport of microplastics.
Researchers studied how fluvial dynamics including flow velocity, turbulence, and river geomorphology influence the distribution and transport of microplastics in river systems. River hydrodynamics were found to be major determinants of where microplastics accumulate and how far they travel, with implications for predicting contamination patterns in river catchments.
On some physical and dynamical properties of microplastic particles in marine environment
This study examined the physical and dynamical properties of microplastic particles in marine environments, using modeling to predict how particle shape, density, and size govern transport, dispersion, and accumulation patterns.
Advancements in numerical simulation of microplastics transport in open waters: Model enhancements and sensitivity analyses of boundary conditions and settling velocities
Researchers updated a three-dimensional particle tracking model for simulating microplastic transport in marine and riverine environments, adding free-slip boundary conditions, settling and resuspension mechanics, and turbulent diffusion, then validated the model against field data from the Ottawa River and Saguenay Fjord.
Study of the influence of fluvial dynamics on the distribution and transport of microplastics.
Researchers studied how fluvial dynamics, including water flow, turbulence, and river morphology, influence microplastic distribution and transport in a river system. The study found that hydrological conditions strongly control where microplastics deposit and how they move through the watershed.
Impact of the Reynolds Numbers on the Velocity of Floating Microplastics in Open Channels
Researchers experimentally tracked the motion of nearly spherical polyethylene, polypropylene, and polystyrene microplastics in open channel flow using video analysis, establishing quantitative relationships among Reynolds number, MP density, and floating velocity to better predict horizontal transport behavior.
Coupling fragmentation to a size-selective sedimentation model can quantify the long-term fate of buoyant plastics in the ocean
A size-selective sedimentation model was coupled with fragmentation dynamics to simulate how large plastic items break down and settle in aquatic environments over time. The coupled model advances predictions of microplastic size distributions and spatial accumulation patterns in rivers and oceans.
Investigating Microplastic Resuspension in Environmental flows: Experimental and Numerical Approaches
Researchers used combined experimental and numerical approaches to investigate the resuspension of microplastics from sediment beds in riverine flows, finding that turbulence intensity during high-flow events plays a key role in detaching MP particles embedded in multi-density granular sediment beds.