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In this paper, water environment influence is simulated effectively from Beilun fifth stage engineering construction based on precise flow field of Beilun harbor. owing to piled wharf structure, engineering construction on non-pollution ecology hydrodynamic environment influence is small, only engineering local has certain influence; During the influence of suspended solids is primary, and affect...
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...
In the course of complex rock slope excavation, with the rescission of lateral stress constraint, the rock mass will produce unloading rebound deformation to the free face. With this course, the primary equilibrium stress state in slope mass is broken, and secondary stress adjustment occurs, which will adapt to the deformation state of continual development until new balance. The result is that the...
The surrounding rock stress field monitoring of sequential mining method has done and the field monitoring data has been compared with numerical simulation results. The result shows: Surround rock stress changes violently when the distance from monitoring section to the lower bench is less than a tunnel diameter, when the distance is more than a tunnel diameter, the surround rock presents rheological...
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...
In this article, Weather Research and Forecast Model (WRF) is coupled with the optimal urban parameterization scheme to study the impact of land cover change in Nanjing on Urban Heat Island (UHI). Results show that urbanization intensifies surface air temperature over the region, with the intensity of UHI increased. After urbanization, wind speed over the downtown decreases rapidly, while Urban Heat...
The flow field in the pipe system of pile extractor of a jack-up oil platform is simulated by solving Reynolds-averaged Navier-Stokes (RANS) equations, which is closed by two equation turbulence model. Several different kinds of fluid were considered in the numerical simulation. Pressure distribution on the inner surface of the pipes and the jetting flow rate were calculated, and some flow details...
According to engineering geological conditions of one certain coal mine, YF20-3 fault of the mine is without water and not leading water by detection and analysis. In order to make full utilization of coal resources, fault pillar is optimized with FLAC3D software in this paper. Based on numerical simulation of fault pillar optimization in fully mechanized caving face, we analyzed dynamic failure mechanism...
Based on the finite volume method of computational fluid dynamics and k-e turbulence model equations, combines the volume of fluid method with the moving mesh method to deal with air-water interface, a 3d unsteady paddlewheel-induced pond circulation while running and shutting off the paddlewheel machineries across the air-water interface is simulated in this paper. In this simulation, some monitory...
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...
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...
Generally, the concrete whose intensity level is C60 and above is called as high-strength concrete. High-strength concrete is usually used for vertical pressure component due to its poor ductility and its advantages of high compressive strength, good fluidity, denseness, low porosity, etc. Combined with engineering examples, monitoring was conducted for the strain on the binding site of high-strength...
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...
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...
The strip replacement mining in short-distance thin coal seam is one of the effective methods controlling displacement deformation of overlying strata and surface subsidence in coal mining under buildings and railroads and water bodies. The method has a great theoretical significance and application value by increasing recovery rate of coal resources and cutting down the effect of coal mining on environment...
In this paper frost heave is simulated numerically by the coupled processes of heat conduction and moisture transport within frozen soil mass. A finite difference computational program developed by the first author is used to simulate frost heave of one-dimensional frozen soil under three different freezing modes including continuous, stepwise and continuous-intermissive mode. The results of simulation...
cataclastic structure rock mass is very common in superficial geological body whose stress-strain law closely concerned with the structural plane. Based on one-dimensional constitutive model presented by Professor GZ-Sun for cataclastic structure rock mass, a three-dimensional constitutive model is established in the paper, and then the model is embedded into FLAC3D by using its user defined model...
Underwater gas jet produces a complex unstable multiphase flow field, which is involved in different technological fields. The VOF multiphase flow model and the RNG κ - ε turbulence model were adopted to predict the structure of underwater gas jet flow field and to reveal the development of transient flow. The features of the developing process of the two phase flow, and the basic characteristics...
The 3-D RNG k - e numerical model of turbulence flow is built with FLUENT software. The mixture motions of water and sand, in the upper direction and side direction, are calculated. The results show that, the effect of jetting in upper direction is evident compare with the jetting in the side direction, under the condition of the same pressure and speed. It's easier to start suspending for the inside...
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