Poojitha D. Yapa

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When gas is released in deepwater, the high pressure and low temperature can convert the gases into hydrates, which are buoyant. As these hydrates travel upwards they will encounter regions of lower pressure and can decompose into free gas. The presence or absence of hydrates has a significant impact on the behaviour of the jet/plume due to the alteration(More)
Previous models on simulating gas releases in deepwater were not focused on the dissolved component and its impact on water quality. This paper presents a new model developed for simulating the transport/spread of dissolved methane from an underwater release and its impact on dissolved oxygen in ambient water. Methane dissolves into ambient water from gas(More)
Abstract Visualization of multi-phase jets and plumes is a relatively new subject. Discussions on how to visualize them have not been seen elsewhere. Multi-phase jets and plumes (e.g. a plume from a deep water blowout that consist of a mixture of oil, gas, and gas hydrates) undergo phase changes during the transport of fluids up the water column.(More)
This paper presents a study on the impact of underwater gas blowouts near the ocean surface, which has a greater relevance to assess Health, Safety, and Environmental risks. In this analysis the gas flux near the surface, reduction of bulk density, and gas surfacing area are studied for different scenarios. The simulations include a matrix of scenarios for(More)
First portion of this report reviews past work related to oil transport and spreading in ice-covered waters to find the most current information available on the subject. The review covers most of the relevant work over the last 30 years. For each work, what they did, their findings and relative shortcomings are described. Where appropriate, comparisons of(More)
The ability to calculate the oil droplet size distribution (DSD) and its dynamic behavior in the water column is important in oil spill modeling. Breaking waves disperse oil from a surface slick into the water column as droplets of varying sizes. Oil droplets undergo further breakup and coalescence in the water column due to the turbulence. Available models(More)
CDOG (Clarkson Deepwater Oil and Gas) model simulates the behavior of oil and gas released from deepwater. The model integrates the hydrodynamics of the jet/plume, the thermodynamics, and the hydrate formation and decomposition. CDOG simulates both the dynamics of the jet/plume phase and the farfield conditions during the rise of oil/gas/hydrates through(More)
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