Large-eddy simulations of turbidity plumes in crossflow

Decrop, Boudewijn; Mulder, Tom De; Toorman, Erik; Sas, M.

doi:10.1016/j.euromechflu.2015.03.013

Cited by 14 publications

(6 citation statements)

References 45 publications

(83 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Multiphase buoyant plumes are of interest in many industrial, environmental, and geophysical applications including aeration columns [Hu and Celik, 2008], smokestacks [Decrop et al, 2015], hydrothermal vents [Walter et al, 2010], CO 2 sequestration [Alendal and Drange, 2001] and large-scale environmental aeration [McGinnis et al, 2004], volcanoes [Kaminski et al, 2005], and deepwater blowouts [Reddy et al, 2012;Joye et al, 2016]. The internal dynamics and resulting environmental pollutant transport of undersea hydrocarbon blowout plumes, exemplified by the Deepwater Horizon incident (DwH) in 2010 [Graham et al, 2011], involve processes that span an exceedingly broad range of temporal and spatial scales.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of rotating bubble plumes in stratified environments

et al. 2017

View full text Add to dashboard Cite

The effects of system rotation on the turbulent dynamics of bubble plumes evolving in stratified environments are numerically investigated by considering variations in both the system rotation rate and the gas‐phase slip velocity. The turbulent dispersion of a passive scalar injected at the source of a buoyant plume is strongly altered by the rotation of the system and the nature of the buoyancy at the source. When the plume is driven by the density defect associated with the presence of slipping gas bubbles, the location of the main lateral intrusion decreases with respect to the single‐phase case with identical inlet volume, momentum, and buoyancy fluxes. Enhanced downdrafts of carrier phase fluid result in increased turbulent mixing and short‐circuiting of detraining plume water that elevate near‐field effluent concentrations. Similarly, rotation fundamentally alters dynamic balances within the plume leading to the encroachment of the trapping height on the source and an increase in turbulent dispersion in the near field. System rotation, even at modest Rossby numbers, produces a sustained, robust, anticyclonic precession of the plume core. The effects of rotation and the presence of bubbles are cumulative. The vertical encroachment of the primary intrusion and the overall dispersion of effluent are greatest at smallest Rossby numbers and largest slip velocities. The main characteristic feature in rotating single‐phase plumes, namely the robust anticyclonic precession, persists in bubble plumes. Analysis of the momentum budgets reveal that the mechanism responsible for the organized precession, i.e., the establishment of an unstable vertical hydrostatic equilibrium related to radial cyclostrophic balance, does not differ from the single‐phase case.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical simulations of rotating bubble plumes in stratified environments

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Buoyant multiphase jets and plumes in crossflow, in particular, have been studied in the context of oil well blowouts in ocean currents [ Socolofsky and Adams , ; Socolofsky et al ., ], artificial aeration in rivers and lakes [ Hugi , ; Lima Neto et al ., ; Zhang and Zhu , ], sediment plumes released from moving dredging vessels [ Smith and Friedrichs , ; Decrop et al ., ], and destratification of waterways to prevent salt intrusion [ Uittenbogaard et al ., ]. Using a towing tank, Socolofsky and Adams [] studied plumes of air bubbles and of crude oil or alcohol.…”

Section: Introductionmentioning

confidence: 99%

“…In a dynamically similar system, Decrop et al . [] report on experiments and simulations of inverted sediment plumes in crossflow containing 5 µm diameter, low Stokes number particles. The Stokes number is the ratio between the particle and turbulence time scales.…”

Section: Introductionmentioning

confidence: 99%

Crude oil jets in crossflow: Effects of dispersant concentration on plume behavior

et al. 2016

View full text Add to dashboard Cite

This study investigates the effects of premixing oil with chemical dispersant at varying concentrations on the flow structure and droplet dynamics within a crude oil jet transitioning into a plume in a crossflow. It is motivated by the need to determine the fate of subsurface oil after a well blowout. The laboratory experiments consist of flow visualizations, in situ measurements of the time evolution of droplet-size distributions using holography, and particle image velocimetry to characterize dominant flow features. Increasing the dispersant concentration dramatically decreases the droplet sizes and increases their number, and accordingly, reduces the rise rates of droplets and the upper boundary of the plume. The flow within the plume consists primarily of a pair of counterrotating quasi-streamwise vortices (CVP) that characterize jets in crossflows. It also involves generation of vertical wake vortices that entrain small droplets under the plume. The evolution of plume boundaries is dominated by interactions of droplets with the CVP. The combined effects of vortex-induced velocity and significant quiescent rise velocity of large ($5 mm) droplets closely agree with the rise rate of the upper boundary of the crude oil plume. Conversely, the much lower rise velocity of the smaller droplets in oil-dispersant mixtures results in plume boundaries rising at rates that are very similar to those of the CVP center. The size of droplets trapped by the CVP is predicted correctly using a trapping function, which is based on a balance of forces on a droplet located within a horizontal eddy.

show abstract

“…The simulated double-plume structure after the CO2 injection and temperature field contours are shown. Decrop et al [16] extensively studied negativelybuoyant, vertically downward injected turbidity plumes, i.e. mixtures of water and sediment particles, in crossflow using two-phase Large-eddy simulations.…”

Section: Introductionmentioning

confidence: 99%