BFC Analysis of Flow Dynamics and Diffusion from the CO_2 Storage in the Actual Sea Bottom Topography

概要

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The diffusion and convection flow will occur concurrently in the CO_2 storage well by being induced from the ocean current and results in the CO_2 diffusion into the ocean. Author studied these phenomena in the ocean and the sea bottom basin in which liquid CO_2 was sequestrated in about a partial depth. The topography of the sea bottom was approximated by the representative three-dimensional shape of a sea mountain and a deep valley with an appropriate height and depth. The governing differential equations converted to the boundaryfitted coordinate system and its FDM scheme with the computer chord were newly developed for this complicated geography. The characteristic properties and behaviors of CO_2 in seawater were taken into the analysis. These include the flux of mass transfer through hydrate, the expansion of water due to CO_2 dissolution and heat of dissolution and the diffusion coefficient in the benthic boundary layer. The numerical solutions of flow dynamics and CO_2 concentrations were computed during the transient state and the quasisteady state, and the results of flow velocity, CO_2 concentration and pH distribution were presented. Through the studies the method of partially filled storage in connection with the sea bottom topography was evaluated.
社団法人日本船舶海洋工学会の論文
2003-08-31