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Keywords: diffusion
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Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-1108
... to the seafloor along z direction. diffusion of mixture is recorded within 20s after launching of devices. INTRODUCTION Interest in deep sea mining is not new (Wedding et al., 2015). Since early 1970s, the potential of abyssal manganese nodule has raised considerable public attention (Erik et al., 2019...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-3222
... In this work, computational fluid dynamics (CFD) simulations have been conducted on leaked LNG vapor diffusion in which the gas is discharged from the vent post of a LNG powered RORO ship. A numerical model is proposed based on an open source Computational Fluid Dynamics (CFD) tool called...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-3120
... vortex generated from the body and its diffusion to the fluid domain should be accurately evaluated, we focus on vortex method. As calculation methods for the viscous fluid proposed previously, mesh method, particle method and vortex method etc. are given. In this research, a fluid domain around...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-1206
... and discussed in detail. Furthermore, the marine garbage treatment program is analyzed. It is found that the topographical features of the location of the ocean waste source affect not only the length of the particle's final drift trajectory but also the particle's diffusion. The increase of wind speed...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-259
... was compared, and then the diffusion of gas clouds and group risk and individual risk under different firewall heights were analyzed. On this basis, a new type of firewall structure characterized with cooling circular tube filled with water was proposed. The effect of two types of firewall on risk reduction...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-183
... ABSTRACT Vortex method is a numerical calculation method for a viscous fluid in time domain, which can consider the vorticity creation from body surface and diffusion of the vorticity into the fluid. To apply this method to the actual design of a floating body with fins installed to reduce its...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-569
... by the mechanism proposed by Somerday et al. (2013). On the other hand, different mechanisms, which are the reaction rate of CO with the iron surface and time for hydrogen diffusion in the material, dominated the inhibitory effect of CO. INTRODUCTION Hydrogen uptake of a material is an essential process...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-708
... ABSTRACT Diffusion measurements and thermal desorption measurements have been performed on a X70 pipeline steel, in as received and normalized and quenched condition, after being hydrogen charged for 200 h at 100 MPa hydrogen gas pressure and 85°C. Numerical simulations based on the assumption...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-202
... Application of particle tracking method in rapid forecasting of migration and diffusion of red tide in the East China Sea Liangyu Chen Information Department, East Sea Information Center, SOA China. Shanghai, China Xiaodan Mao Department of Key Laboratory, National Engineering Research Center...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-094
... ABSTRACT Clad pipes are manufactured both with and without a thin nickel interlayer. Diffusion of carbon from the base material to the clad, which degrades the structure adjacent to the interface and increases the local embrittlement, is effectively reduced by this interlayer. However...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-374
..., which is dominated by the rotational tidal current, show more diffusive characteristics than those released in Xiyang Trough, where the tidal current is bi-directional. The fraction of total wastewater that originated from different tidal troughs is calculated, which indicate that the source...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-632
.... The turbine load is replaced for the orifice load in order to simplify the problem. In analysis of the wave motion, vortex method which can consider fluid viscosity is used. Vorticity layer model and Core-Spreading method are used in order to calculate vorticity creation from body surface and diffusion...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-134
.... Therefore, it is necessary to develop a less costly leak detection and location technique without downhole logging. casing and cementing application natural gas dispersion completion installation and operations reservoir surveillance helium gas well flow time diffusion production...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-289
... ABSTRACT In this study, a two-step oil spill forecasting system is developed. In the first step, once the volume and properties of the spilled oil were known, the initial oil spill area and the successive diffused area were estimated using empirical formulas. The oil slick trajectories were...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-638
... with or without a diffusion slab. In order to validate the methodology, tests have been performed with a hydraulic jack in the GDF SUEZ research laboratories dedicated to transmission pipelines. A discussion on the parameters of interest is provided: diffusion, soil horizontal coefficient, slab bonded...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-581
..., the tensile stresses and the level of hydrogen predicted by the computer model is considered to support the experimental findings. weld metal hydrostatic pressure offshore pipeline hydrogen concentration metals & mining weld hydrogen diffusion welding concentration hydrogen simulation...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-162
.... sweep range modeling & simulation island module engineering coefficient oil spill accident wind direction oil particle flood current oil film xiamen bay prediction sea area formula upstream oil & gas diffusion chemical spill migration path Numerical Simulation of Accidental...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-470
... vorticity layer potential theory vortex method convection step experimental result equation calculation method stream function boundary condition boundary amplitude free surface body surface blob diffusion renewable energy boundary element method subsea system reservoir simulation vortex...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-393
... for turbulence, coupling algorithms for interactive body motion and enhanced numerical efficiency through local-grid-refinement and parallelisation. boundary condition wellen diffusion reservoir simulation abc proc fluid dynamics two-phase flow wemmenhove wave impact multiphase flow application...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-602
... if the liner is in good condition without pinholes or other defects and still is providing a high degree of diffusion protection against aggressive species in the water debonding of the liner in a pipeline can still occur. In particular, the theoretical reasons are given to show that under certain conditions...

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