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Studies of particulate plume diffusion over laboratory wind-generated water waves
Abstract A numerical simulation of the turbulent mass diffusion process from an elevated, continuous point source over a wind-disturbed water surface is described. The diffusion equation, with models for turbulent diffusivities, in the boundary layer over water waves was solved with a successive-over-relaxation finite difference scheme. In the numerical computation, measured quantities of flow conditions such as mean velocities, turbulent intensities and boundary layer thickness were used. To improve computational efficiency, a variable grid system was used. The grid system was designed to expand with the spread of the diffusing plume. The water surface was viewed, in the mean, as a flat surface with influences of the wavy surface implicitly incorporated into the turbulent diffusivities. The diffusivities are functions of the turbulent intensities, the boundary layer thickness, and the scale of the phenomenon. The numerical solutions were compared with experimental results of particle concentration measurements obtained with an optical system (Liu and Karaki, 1972a) in a wind-water tunnel at Colorado State University. With the net mean convection properly corrected for the effects of the particle fall velocity, streamline displacements in a developing boundary layer, and secondary flow (in the experimental facility), general agreements were observed between numerical solutions and corresponding experimental results.
Studies of particulate plume diffusion over laboratory wind-generated water waves
Abstract A numerical simulation of the turbulent mass diffusion process from an elevated, continuous point source over a wind-disturbed water surface is described. The diffusion equation, with models for turbulent diffusivities, in the boundary layer over water waves was solved with a successive-over-relaxation finite difference scheme. In the numerical computation, measured quantities of flow conditions such as mean velocities, turbulent intensities and boundary layer thickness were used. To improve computational efficiency, a variable grid system was used. The grid system was designed to expand with the spread of the diffusing plume. The water surface was viewed, in the mean, as a flat surface with influences of the wavy surface implicitly incorporated into the turbulent diffusivities. The diffusivities are functions of the turbulent intensities, the boundary layer thickness, and the scale of the phenomenon. The numerical solutions were compared with experimental results of particle concentration measurements obtained with an optical system (Liu and Karaki, 1972a) in a wind-water tunnel at Colorado State University. With the net mean convection properly corrected for the effects of the particle fall velocity, streamline displacements in a developing boundary layer, and secondary flow (in the experimental facility), general agreements were observed between numerical solutions and corresponding experimental results.
Studies of particulate plume diffusion over laboratory wind-generated water waves
Liu, Hsien Ta (author) / Karaki, Susumu (author)
Atmospheric Environment ; 7 ; 869-890
1973-03-06
22 pages
Article (Journal)
Electronic Resource
English
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