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Steady cavity flow of 2-D hydrofoil is simulated by CFD software. The impacts of different cavitation model to the numerical simulation results are analyzed. The pressure distributing curve and volume fraction distributing map are obtained through the detailed analysis to the cavity flow under different cavity number. The analysis results show that those cavitation models simulate the origination...
Huantai county is a typical well-irrigated district in North China, where the surface water resources is scared and the groundwater is the main resources exploited for agricultural and industrial production and living, however the groundwater level had been declining in recent years. Aiming at exploiting the groundwater reasonably and maintaining water resources balance of the region, the paper presented...
By using the second version of the Community Atmosphere Model (CAM2) of NCAR, the general circulations of the Earth's atmosphere were simulated under different obliquity condition. The results imply that three-cell circulation turn weak when the obliquity turn large except that the three-cell circulation in Northern Hemisphere in winter, Hadley circulation in Southern Hemisphere in spring and Hadley...
Select a 1∶1 car model which is in our independent research and is the production cars as research subject, according to the need of study, it simplifies the vehicle shape appropriately, uses the software of HyperMesh to mesh grid according to tetrahedron and hexahedron grip program, combines STAR — CD of CFD software with CATIA of CAD software, simulates the CFD of the vehicle, the simulation result...
The influence of four different cacuum pressure on drying process of RDX with relative moisture content 8% was investigated at 70°C. The results show that the greater the vacuum is, the shorter the drying cycle is and drying rate accelerates, but when vacuum is up to a certain extent, it is limited to increase the drying rate; critical moisture content and equilibrium moisture content don't generally...
Unmanned Surface Vehicles (USV) with a high sailing speed, are capable of Intelligence Surveillance & Reconnaissance (ISR), arm protection, mines sweeping, anti-submarine, precision strikes and other functions, widely display the great value of military application. The excellent navigation performance of the usv directly relates to the vitality and battle effectiveness. In the paper, In virtue...
A 3-D numerical simulation on the combustion of a Claus sulfur recovery combustor was carried out on the basis of commercial CFD software FLUENT. The Eddy Dissipation Concept model was employed for calculating the chemical reaction rate. The turbulent flow was simulated by using the RNG k-e model combined with the standard wall-function method. The second-order upwind difference scheme and the pressure-based...
To analyse the major factors that affect temperature field during the laser cladding process, the paper build a finite element calculation modle of temperature field in the case of titanium alloys laser cladding process by multi pass lap surfacing,in consideration of heat source model, material thermophysical property and meshing situation. Then 3D numerical simulation was made for the temperature...
In order to validate the application of Large eddy simulation in the field of incompressible flow, the author used Large eddy simulation to compute 2-dimensional incompressible flows around an airfoil by software Fluent. In the beginning of computation, the paper prepared five types of mesh in order to check up the LES requiring for mesh. Then the author monitored lift coefficient and drag coefficient...
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...
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...
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...
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...
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...
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...
10000KN fine blanking presses is a kind of large-scale Forging equipment, which support immense pressure and stamping frequency in the process. The deformation and vibration of the fine blanking press frame have direct relationship with the tool life and the component precision. Therefore, the high structural stiffness and the good dynamic performance are predominant requirements for the reliability...
Using Numerical Methods to research disc separator inner flow field is an important method to optimize the design. This article based on VOF model, N-S equations and RNG k-ε model, solved with the SIMPLE algorithm, simulated separator oil-water separation process respectively with initial state filled with water, oil and oil-water mixture this three different initialization conditions by using flunet...
The scarcity of ground-truth data for intercomparison and validation obviously limits the development of rogue wave detection algorithms from synthetic aperture radar (SAR) images. In this study, a numerical method of SAR image simulation for the purpose of validating rogue wave detection algorithms is proposed. Our work is divided into two parts, this first part focuses on SAR image simulation unique...
The paper uses the method of numerical simulation for the environmental pollution problem of the ocean dumps from offshore industries; it adopts ECOM-3D Water Quality Model; and it has carried out the simulation research on those projects' influence on the environment of sea area, and confirmed the influence range of sewage point's diffusion. The research result is helpful to the implementation of...
The mining face in the Twelve Mine belong to Pingdingshan Colliery Group Co. LTD is immerged in the depth of 1015m between 1130m. Extraction Scheme of Protective Seams was used as the key technology. So the law of mine pressure in the tunnel below should be further researched. To the actual actual conditions, the three-dimensional model was build using the FLAC3D. The mine pressure in the tunnel below...
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