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Experimental and numerical studies were carried out to investigate the viscous hydrodynamic forces acting on a tanker model in oblique motion. Oblique towing tests with a KVLCC2 model were conducted in the towing tank of Shanghai Jiao Tong University(SJTU) in deep water. The lateral forces and yaw moments on the model at different drift angles were measured. The viscous flow around the tanker model...
A large drainage pumping station by lateral oblique water way, which installed five shaft tubular pump, with single pump design flow 34m3 / s. The numerical simulated and hydraulic optimization is worked by using three-dimensional simulation software CFD on pumping station pool rectifier. Analysis results from numerical simulation: within a certain hydraulic losses range, the retaining water weir's...
With the development of urbanization, more and more buses come into people's lives, and a lot of bus fires have occurred to personnel and properties in occupied areas. So this paper aimed at the typical bus fires, through setting different fire scenarios, dynamic process of bus fires was studied by using FDS, and the effects of combustible material type, fire source location and ventilation on smoke...
A new evaluation index of flocculation effect - the vortex velocity gradient G' was introduced in this paper, on the basis of currently existing evaluation indexes of flocculation effect —turbulent kinetic energy k and effective energy consumption ε; then combined three indexes the CFD numerical simulation of lattice flocculent pond was conducted. The results indicate that the numerical calculation...
Based on the large-span spatial structure of Ordos's airport terminal of the extension project, a set of construction process and key technology for large-span spatial steel structure was discussed in detail, including elementary assembly on ground, segmental hoisting, overhead unit connection and curvilinear accumulated sliding. A set of multi-stage construction analysis method was put forward. Through...
Many mountain hazards like snow avalanches, landslides, rock falls, debris flows have the characteristics of granular flow, and therefore the research on the processes of granular flow influenced by different factors is favorable to the human's acquaintance with the characteristics and regularities of mountain hazards. As a result of the further research, the disaster prevention and mitigation could...
Balcony greening have the ecological effects on reducing temperature and increasing humidity,purifying air and beautifying environment etc. Combined the experiments with simulation, by figuring out the potency of reducing temperature and increasing humidity of balcony greening on indoor thermal environment, the correctness of the model was verified. The results show that the temperature of the greening...
2D numerical simulations of some control valve were carried out based on RANS method by using FLUENT 6.3 software. The finite volume method, standard k-ε turbulence model and SIMPLE algorithm were applied in the calculations, the main factors of cavitaving flow in control valve was found out. According to the principle of throttle step-down, mutations in a high pressure drop to the pressure gradient...
Soft soil condition, especially in Bohai, may cause spud foundation punch-through failure which may be a major cause of foundation failure of jack-up self-elevating drilling platform. The chief aim of this study is to investigate the uplift behavior with the different soil condition and spud foundation shape by theory analysis and numerical simulation. In addition, the spud foundation of Bohai No...
Navigation in meandering channels usually requires straightening the river. Cutoffs across the neck of long meander bends improve the alignment of the river, reduce sinuosity, and shorten the river length, thus increasing the channel slope. In the present paper, the planform evolution of a meandering channel with cutoff is simulated by a 3D mathematical model, in which turbulence flow, sediment transport...
In this paper, we develop a new way to seek the source for a dust storm event which affects the air quality based on the new idea of numerical simulation method taking consideration of the discontinuity of meteorological fields.
In order to know about coke phenomena of 130t/h boiler with tangential firing, velocity and valves characteristics of primary and secondary air were measured. Fireworks test and numerical simulation were done at the condition of actual working and uniform air distribution, and the tangential circle diameter of actual working and uniform air distribution were obtained. The results show that the boiler...
Based on turbulence model the standard k-ε model provided by professional computational fluid dynamics software Fluent, the 3D steady wind flow field around Changsha Huanghua International Airport in atmospheric boundary layer is numerically simulated. The wind pressure coefficients, the wind environment around the Airport etc. under different wind direction are studied to give for design reference...
Aiming at the seriousness and harmfulness of nitrogen pollution, in order to protect water resources and human health, this paper outlines nitrogen transport and transformation process in the groundwater. Based on the analysis of the present research situation about nitrogen transport and transformation at home and abroad, the authors think that 0-level or first-order kinetics hasn't describe nitrogen...
Based on the theory research of the scour under submarine pipelines, some formulae about erosion-stopping velocity and erosion hole depth were set up. Besides, a vertical two-dimensional numerical model was used to simulate the time dependent local scour below submarine pipelines subject to unidirectional steady flow. It is found that standard k -ε turbulence model is more preferable than the SGS...
In order to research the nuclide migration behavior in a preselected area of high-level radioactive waste disposal repository in China, theoretic models of groundwater flow and nuclide migration are built, correlative parameter conditions including medium parameters, boundary conditions and initial conditions are ascertained, and three-dimensional numerical simulation of tritium migration is carried...
Due to restriction of product condition, dust pollution treatment scheme with coal warehouse roof in coal wahery is impossible to be determined after several installation commissioning and testing. In order to choose appropriate dust control scheme, according to numerical simulation method, this paper simulates two kinds of feasible dust control schemes with the fluid calculation software, analyses...
Researching on the mathematic model of mill dust in the polar plate of ESP, with the change of thickness of mill dust in the plate, we certain on the best value of shaking acceleration, and make the maximum of particle off in some domain. Based on the Matlab emulation, shaking acceleration has a maximum criticality value under some special resistivity and initial thickness; Before reaches the maximum...
This paper studied the efficiency of the oilfield water injection system by using the water injection system theory, fluid mechanics theory, and graph theory and optimization design technology. According to the actual conditions, the paper established the mathematical model of Wuliwan oilfield pipe network. Based on the actual data of production, energy distribution of oilfield water injection system...
Although flocculation tank is an important structure in water treatment process, its process optimization cannot be achieved due to deviation caused by different designers selecting design parameters in a wide range. To address the above problem, a CFD simulation study on a single vertical shaft of lattice flocculent pond was carried out to explore a new way for the lattice flocculent pond design...
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