Papers by Keyword: Fluent

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Authors: Hui Li, Rui Li Wang
Abstract: Based on the principle and method of computational fluid dynamics (CFD), using the software, FLUENT, the inner flow field in a mixed-flow stirred reactor was simulated and the flow details were studied roundly. This article analyzed the three-dimensional velocity field distribution and testified the reliability of numerical simulation to a certain extent. The simulated effect was proved effective. The results of this paper provided a good base and reference for the further research of the stirred reactor.
Authors: Hui Li, Xiao Jun Guo
Abstract: Based on the principle and method of computational fluid dynamics (CFD), using the software, FLUENT, the inner water flow field in a hydrocyclone with air column was simulated and the flow details were studied roundly. This article analyzed the three-dimensional velocity field distribution, pressure field distribution and testified the reliability of numerical simulation to a certain extent. The “mixture” model was used to simulate the air column the first time and contrasted with experimental result, the simulated effect was proved effective. The results of this paper provided a good base and reference for the further research of solid-liquid separation.
Authors: Božidar Šarler, Robert Vertnik
Abstract: There is a continuously developing need for benchmarking of solidification simulations - from the theoretical [1] as well as from the applied [2] points of view. The history of related benchmarking shows differences of the results between different numerical methods, and differences in comparison with the experiments when solving even quite simple solidification situations. The present benchmark test proposes macrosegregation [3] upgrades to the verification benchmark for continuous casting of steel, first presented in [2]. The paper represents guidelines for the presentation of the numerical method, discretisation and results and shows a reasonable comparison between a commercial finite volume based code and our in-house developed meshless method based code.
Authors: Chang Feng Guan, Wei Peng, Liu Qin, You Chen Zhang, Wei Min Yang
Abstract: A simplified 3D model of a rotational molding machine oven was built, and a numerical investigation was carried out with the RNG k-ε approach in FLUENT. Since the temperature field in the original oven structure was distributed unevenly, three types of reformed designs were proposed and numerically studied. Results showed that by changing the inclined angle of inlet flow to 30° downward, hot air flowed onto the mold surface directly, the temperature field around the mold became more uniform but temperature in the bottom of the mold was still a little bit low. By changing the inclined angle of hot air to 30° downward and 45° rightward and leftward, or by changing both the cross sectional dimension of the inlet to 900mm×400mm and the inclined angle of hot air to 30° downward, the temperature field became more uniform and the average temperature around the mold remained relatively high, these two reformed designs were effective with good feasibility and economic efficiency, which could be considered in the future design of rotational molding machine.
Authors: Qing Chun Ma, Lai Bin Zhang
Abstract: Well site safety plan, which included well design, emergencyresponse plan (ERP) etc, is the key prerequisite for drilling the critical sour gas well. A right emergency response zone (EPZ) is quite difficult to make sure on the site, because that it affected by release rate of H2S, gas composition, the well site surrounding topography, and other specific circumstances. To solve this problem, A blowout simulation software based on FLUENT be developed, which could predict affected areas when the critical sour blowout, the gas flow direction, and the H2S concentration distribution. On this basis, the safety layout surrounding the well site can be planned. The article provides the design structure and main functions of the software. The software can provide the theoretical basis of industrial safety.
Authors: H.A. Chowdhury, Saiful Amri Mazlan, Abdul Ghani Olabi
Abstract: Magnetostriction is the deformation that spontaneously occurs in ferromagnetic materials when an external magnetic field is applied. In applications broadly defined for actuation, magnetostrictive material Terfenol-D (Tb0.3Dy0.7Fe1.9) possesses intrinsic rapid response times while providing small and accurate displacements and high-energy efficiency. These are some of the essential parameters required for fast control of fuel injector valves for decreased engine emissions and lower fuel consumption compared with the traditional solenoid fuel injection system. A prototype CNG fuel injector assembly was designed which included magnetostrictive material Terfenol-D as the actuator material. A 2D cross-sectional geometry of the injector assembly, which incorporated both linear and non-linear magnetic properties of the corresponding materials, was modeled in ANSYS for 2D axisymmetric magnetic simulation. Subsequently, a 3D replica of the CNG flow conduit was modeled in GAMBIT with the resultant injector lift. The meshed conduit was then simulated in FLUENT using the 3D time independent segregated solver with the Standard k  , the Realizable k   and RSM turbulence models to predict the mass flow rate of CNG to be injected. Eventually, the simulated flow rate was verified against mathematically derived static flow rate required for a standard automotive fuel injector considering standard horsepower, BSFC and injector duty cycle.
Authors: Ang Li, Jin Yun Pu
Abstract: With the aid of “gambit” and Reynolds Stress Transport Equations, the residential cabin model and the turbulence model were established. By observing the effects of additional inertia force exerting on the water dynamic features of damaged vessels under different linear accelerations, the following conclusions could be obtained: (1) the inflow direction through square and round breaks is deviated from the heave, and contrary to the sailing direction; while that derivation of triangle breaks is comparatively smaller, less effected by inertia force (2) within high turbulence intensity areas, square breaks mainly appear in pre-inflow areas, and triangle and round breaks mainly occur in post-inflow areas (3) with the increase of acceleration, the flow coefficient of the three kind of break tends to decline, whereas that trend seems to be less noticeable with triangle breaks (4) under the effect of inertia force, the shrink coefficient of the three types of break incline to drop; the round breaks is less effected while a distinct variance could be observed in the cases of square and triangle shaped breaks.
Authors: Hui Juan Guo, Xiu Ping Su, Xiao Lei Xia
Abstract: t is important for dynamic characteristics of electromagnetic release with oil dashpot to calculate the oil damping force. The formula of the oil damping force is deduced by the theoretical formula of viscous damper or according to the experimental results. Therefore, a way to analyze oil damping force of electromagnetic release with oil dashpot is proposed based on Fluent due to the limitations of the two methods in this paper. The curve which is the speed of the plunger variations of the oil damping force is drawn through the numerical analysis of the flow field and the index of the speed is fitted.
Authors: G. Srinivas, B.P. Madhu Gowda
Abstract: Any aircraft wing is the major component which will play vital role in the generation of lift and at different maneuvering moments throughout the flight. So to maintain this good maneuverability the aircraft wing has to undergo deferent deflections called angle of attack such that the high lift and low drag or vice versa can be settled in the flight. Taking this as the motivation the analysis was carried out on the standard wing airfoil comparing with new designed airfoil. Analyze the numerical simulation values like coefficient of lift, coefficient of Drag, Lift, Drag, and Energy parameters with wind tunnel data to predict accuracy for both the airfoils. Through the selected public literature standard airfoil data and designed airfoil data has been chosen, the geometry was created in the GAMBIT and also the meshing by selecting the suitable c-grid and rectangular grid for the better flow analysis in the FLUENT. The mesh file was imported into the FLUENT software there suitable boundary conditions and operating conditions are given for successful flow convergence. Finally analyzing these results are expecting to be best suitable for good aeromechanical features.
Authors: Zhen Wei, Yuan Chang Deng, Wei Zhang, Zheng Hao Yang
Abstract: The choice of wind measured data and numerical simulation method has an important impact on the results of wind resource assessment. This paper will take a wind farm, in Yangjiang City, Guangdong Province, for an example and discuss the simulation accuracy by linear model WAsP and nonlinear model based on simulation software Fluent. First of all, contrast mean absolute percentage error (MAPE) about simulated wind speed under four kinds of wind conditions, which are simulated by four sets of wind data in WAsP, and then select the wind data with the smallest . Then, using WAsP and CFD method simulates wind field by the optimal wind data. Compare simulated wind speed and annual generation capacity. In this paper, the simulated wind speed in the simulation model CFD based on Fluent is closer to the measured wind speed. The MAPE of wind speed and annual generation capacity by CFD model is smaller than that by WAsP. Therefore, for the wind resource assessment in the complex terrain, the nonlinear model CFD based on Fluent will be qualified to response the relationship between wind resource and terrain, simulation accuracy, and has higher simulation accuracy than the linear model WAsP.
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