Modeling the flow regime near the source in underwater gas releases

Premathilake, Lakshitha; Yapa, Poojitha D.; Nissanka, Indrajith D.; Kumarage, Pubudu

doi:10.1007/s11804-016-1376-4

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…In these cases, we use the bubble plume Froude number initial condition proposed by Wüest et al [56] and detailed for the SPM in Socolofsky et al [8]. Alternatively, the zoneof-flow establishment could be considered, as in Premathilake et al [57]. If the release is single-phase or if the release includes ambient fluid as part of the release, then the velocity of the released fluids substitutes for the Wüest et al [56] initial condition.…”

Section: Initial Conditionsmentioning

confidence: 99%

Integral models for bubble, droplet, and multiphase plume dynamics in stratification and crossflow

2018

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We present the development and validation of a numerical modeling suite for bubble and droplet dynamics of multiphase plumes in the environment. This modeling suite includes real-fluid equations of state, Lagrangian particle tracking, and two different integral plume models: an Eulerian model for a double-plume integral model in quiescent stratification and a Lagrangian integral model for multiphase plumes in stratified crossflows. Here, we report a particle tracking algorithm for dispersed-phase particles within the Lagrangian integral plume model and a comprehensive validation of the Lagrangian plume model for single-and multiphase buoyant jets. The model utilizes literature values for all entrainment and spreading coefficients and has one remaining calibration parameter j, which reduces the buoyant force of dispersed phase particles as they approach the edge of a Lagrangian plume element, eventually separating from the plume as it bends over in a crossflow. We report the calibrated form j ¼ ½ðb À rÞ=b 4 , where b is the plume halfwidth, and r is the distance of a particle from the plume centerline. We apply the validated modeling suite to simulate two test cases of a subsea oil well blowout in a stratificationdominated crossflow. These tests confirm that errors from overlapping plume elements in the Lagrangian integral model during intrusion formation for a weak crossflow are negligible for predicting intrusion depth and the fate of oil droplets in the plume. The Lagrangian integral model has the added advantages of being able to account for entrainment from an arbitrary crossflow, predict the intrusion of small gas bubbles and oil droplets when appropriate, and track the pathways of individual bubbles and droplets after they separate from the main plume or intrusion layer.

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Section: Initial Conditionsmentioning

confidence: 99%

Integral models for bubble, droplet, and multiphase plume dynamics in stratification and crossflow

2018

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“…The main research innovations following DWH for integral models were made through development and validation of TAMOC (Gros et al, 2017, Dissanayake, Gros, et al, 2018). Premathilake et al (2016) also improved simulation of the zone of flow establishment for a gas release, and industry models were also improved to hindcast the dynamics of the DWH (Socolofsky et al, 2015; Spaulding et al, 2017).…”

Section: Empirical and Integral Modelsmentioning

confidence: 99%

A Review on Multiphase Underwater Jets and Plumes: Droplets, Hydrodynamics, and Chemistry

Boufadel

Socolofsky

Katz

et al. 2020

Reviews of Geophysics

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Jets and plumes have been the focus of quantitative investigations since the mid‐1950s. These investigations intensified following the Deepwater Horizon oil spill, in which thousands of tons of oil and natural gas were released into the Gulf of Mexico. This review focuses on plume dynamics that apply to both single‐phase and multiphase liquid‐in‐liquid and liquid plus gas into liquid plumes, including bubble and droplet formation, and heat and mass transfer. Broadly, our work highlights several previously unknown or overlooked aspects of multiphase flow in the deep oceans. Upstream of the jet release, multiphase hydraulics can significantly affect the turbulence, for instance, through churn flow that enhances the turbulence in the free jet, affecting the conditions where bubbles and droplets are formed. Droplet formation was a major focus recently, with experiments covering a range of scales and flow rates of oil and gas at low and high pressure. Detailed observations of droplet formation at the jet‐water boundary reveal the formation of compound droplets, which are emulsions of oil and water with implications for mass conservation and mass transfer. At the plume scale, integral models have been adapted to include the complex thermodynamics and chemistry of oil and gas plumes. In parallel, significant advances were made in numerical simulations of multiphase plumes through large eddy simulations by treating the oil and gas either a continuous or discrete phase. Through this work, a vivid picture of the complex droplet, chemical, and hydrodynamic behavior of multiphase plumes in the ocean is emerging.

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Experimental research of flow rate and diffusion behavior of nature gas leakage underwater

Zhang

Zhu

Peng

et al. 2020

Journal of Loss Prevention in the Process Industries

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Modeling the flow regime near the source in underwater gas releases

Cited by 6 publications

References 27 publications

Integral models for bubble, droplet, and multiphase plume dynamics in stratification and crossflow

Integral models for bubble, droplet, and multiphase plume dynamics in stratification and crossflow

A Review on Multiphase Underwater Jets and Plumes: Droplets, Hydrodynamics, and Chemistry

Experimental research of flow rate and diffusion behavior of nature gas leakage underwater

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