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For this problem, the development of CFD provides powerful tool which can calculate high-precision numerical solution and achieve visualization[3,4].
Simulation Results and Analysis The Internal Flow Field of Micro Injector.
All units of the whole flow field must be initialized before simulation, then labeling the air area.
Mathematics and Computers in Simulation [M].Holland: North Holland, 1981
Numerical Simulation of Engineering Fluid by Using CFD Software[J].

In the present research an algorithm using the particle tracking capability of a commercial computational fluid dynamics (CFD) software to capture free surface entrainment events was applied to simulations of mould filling.
Fig. 1 shows the dimensions of the mould used for simulation and experimental validation.
The geometry of the mould used for the casting experiment and simulations.
To simplify the simulation, the model used single-phase CFD software, and considered only that double oxide films formed during mould filling.
Gebelin, Assessment of Casting Filling by Modeling Surface Entrainment Events Using CFD, in: 2010 TMS Annual Meeting & Exhibition, 2010

The pressure difference under different airflow velocity between two pressure openings set up at fuze inlet tube throat and expansion section was obtained by CFD simulation.
Through the simulation and analysis on ballistic characteristics and fluid pressure characteristics , the time characteristics of pressure difference of the pressure openings were summarized.
Results and discussion Building of numerical simulation model.Some radio proximity fuze was introduced as the studied object.
Fig. 3 External trajectory and projectile velocity curves The relation of shock wave producing position and inlet airflow velocity.The simulation was made utilizing the foregoing numerical simulation model of inlet channel in the range of 0.1M-1.6M of inlet airflow velocity.
The simulation results showed that the time of the pressure difference disappearance was in the range of 1.60-11.19s at different projectile velocity.

2D Simulation of Effects of Position of Baffles on the Removal Rate of Solids in a Sedimentation Tank Y.L.
Wei Institute of Hydraulic Engineering, Xi’an University of Technology, Xi’an China liuyuling@xaut.edu.cn Keywords: position of baffles ; simulation; hydraulic characteristics; sedimentation tank Abstract.
Ekama and Marais[2] studied the secondary sedimentation basin design, with a two-dimensional Computational Fluid Dynamics (CFD) model, Settler CAD, used as a basic three-dimensional full-scale sedimentation basin.In this paper, we use solid–liquid two-phase mixture model and select the k-ε turbulence model to conduct numerical simulation of the effects of position of baffles on the removal rate of solids in a sedimentation tank.
Numerical simulation and validation A.
,CFD methodology for the design of sedimentation tanks in potable water treatment.

This study based on the simulation and analysis of building wind environment done with the aid of computer.
In 1974, Denmark scholar Nelson R.M. 25 was the first application of CFD model to predict structures of flow field and heat transfer phenomena in academics, as information is developed, advances in computer instruction cycle, numerical simulation of fluid dynamics in recent years has been widely used in exploring architectural analysis of the wind field.CFD simulation is based on the governing equations of continuity, momentum, temperature, species, turbulent energy and turbulent dissipation rate.The study was conducted by solving the hydrodynamic equations group and P.J Richards, R.
Musy, who proposed boundary area is calculated as reference for this study, the scope of this study is set to 2846m × 1595m × 576m(Fig.2-a).In the area for simulation calculation, the method of mean grid setting will be adopted to verify the digital simulation.
The results are as follows: The simulation result of the original design.
We therefore revised some of the building layout and conducted another computer simulation analysis.

CFD Investigation for Indoor Environment of A District Standard Room in Jinan City Dong Yang1,2,Qingmei Wen1,2,a,Congju Zhang1,2,Xueting Liu1,2,Shijun Wei1,2 1Key Laboratory of Renewable Energy Utilization Technologies in Buildings of the National Education Ministry, Jinan 250101, China 2Shandong Provincial Key Laboratory of Building Energy Saving Technology, Jinan 250101, China awenqingmei713@163.com Key Words:roof radiation;displacement ventilation;composite systems;numerical simulation Abstract.
Simulation results and analysis Characteristics of indoor temperature distribution.
Conclusion Use the CFD method to simulate the temperature and velocity field of the room, whose system is combined with cooling roof and displacement ventilation, contrast verification of all data show that this simulation model is established by reasonable, the combination of cooling roof and displacement ventilation system can overcome the shortcomings that when they used along, so that is very good to meet the requirement of thermal comfort.
Simulation and Analysis of the Radiant Floor Cooling and Displacement Ventilation System[J].
Numerical Simulation of Different Kinds of Air Distribution For the Indoor Environment Quality [D].Chongqing University, 2005,10

The CFD computational result and the analysis show that the airfoil of the seagull is suitable for the special work circumstances of the small wind turbine, and it can be used for the further design of the blades.
Analyzing the specific performance under the Low-Reynolds number by using the CFD software in order to simulate its aerodynamic performance which is installed upon the small wind turbine.
Figure.10 shows simulation of combined wind wave model.
Matlab code for wind turbine simulation model Figure 12 Simulation curve of wind turbine simulation system The data can be found through the above result.
Conclusion In this paper, using the results of bionic experimental airfoil through references, carrying out numerical simulation by CFD and analyzing the effect of the parameters of the seagull airfoil by software profili.

The analytical verification is conducted with a commercial CFD software.
Makowski and Kim [4] described various aspects of applying CFD to the simulation of the external aerodynamics of ground vehicles.
Detailed steps of a simulation strategy using unstructured-mesh-based solver technology in Fluent software were discussed.
Details of transmission elements, which should be relocated in the new designs, are all enveloped within the chassis and are not considered in the CFD simulation.
Conclusions drawn from the CFD results are as follows.

In 2000, Iaccarino[6] used a variety of commercial CFD software for numerical examples in this study.
Prediction of the turbulent flow in a diffuser with commercial CFD codes [R].
Large-eddy simulation of a separated plane diffuser [R].
Turbulence Modeling for CFD [M].
Reflection and simulation studies of turbulence modeling [D].

Structure Design of and Numerical Simulation on an Annular Reverse Circulation Drill Bit Jinsong Wang a, Pinlu Cao b,*, Kun Yin c College of Construction Engineering, Jilin University, Changchun 130026, China awangjs12@mails.jlu.edu.cn, bjluplc@163.com, cjluyink@163.com Keywords: Reverse circulation drilling; Normal inner nozzle drilling bit; Annular reverse circulation drilling bit.
In this paper, the computational fluid dynamics (CFD) code, FLUENT, is employed to simulate the flow phenomena of reverse circulation drill bit.
Numerical simulation results show that the values of negative pressure of new type annular reverse circulation drill bit which formed in the center channel and the bottom of hole were larger than those of the normal bit.
(a)Normal drilling bit (b) Annular drilling bit Fig.6 The mass flow rate of the boundaries Conclusion We use the computational fluid dynamics (CFD) code, FLUENT to simulate the flow phenomena of reverse circulation drill bits.