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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Numerical models to simulate oil and gas blowout plumes and associated chemical and physical process...
Numerical models to simulate oil and gas blowout plumes and associated chemical and physical processes of hydrocarbons
Author : ANUSHA L. DISSANAYAKE (1), INOK JUN(2) & SCOTT A. SOCOLOFSKY(3)
ABSTRACT
In this paper, we present an integral plume-modeling suite that is developed to simulate multiphase oil and gas blowout
plumes and demonstrate the model validations against laboratory and field data. The modeling suite is capable of simulating
plumes formed in both stratification-dominant (Stratified Plume Model) and ambient current-dominant (Bent Plume Model)
environments, along with hydrodynamic, chemical, and thermodynamic processes of hydrocarbons. The fate of these
hydrocarbons released as plumes significantly depends on their rise velocity, mass transfer rates, and induced plume
velocities. However, especially in the deep ocean, physical and chemical parameters of the gas bubbles are potentially
affected by the formation of clathrate hydrate shells around them, yielding unknown mass transfer effects. Hydrate shells
can stop the fluid circulation within a bubble and interfere in the mass transfer between the bubble and ambient. During the
model calibration for the bubble dissolution rate, we found that the transition of a bubble status from clean to dirty in the
ocean depends on the initial bubble size, and hydrate kinetics could accelerate this transition time at high levels of
subcooling. But, hydrate skins generally do not inhibit mass transfer below standard values for contaminated interfaces. The
stratified and bent plume models are developed based on the Eulerian double-plume model theory and Lagrangian
approach, respectively. The plume models are capable of simulating the size distributions of the dispersed phases and their
separation from the main plume in high cross flow conditions. These models can predict the distribution of oil/gas in the
water column along with their approximate surfacing volume, time, and location with respect to the plume release point.
These parameters are important for contingency planning and response to accidental under water oil/gas spills.
File Size : 1,571,836 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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