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CFD simulation of the liquid-column flow field of double contact Lijun Fang1, a, Yanchao Chang2,b 11School of Energy Power and Mechanical Engineering,North China Electric Power University, Baoding 071003,China afanglijun2009@163.com, bchangyanchao12345@163.com Key words: double contact ; liauid-column tower; flow field; pressure drop.
Through the numerical simulation of the particular condition, gas flow condition was described in conditions of different nozzle number and different liquid air ratio.
Guo Ruitang[1] went on numerical simulation of flow distribution in the wet FGD impinge liquid-tower and the SO2 absorption, using CFD software Fluent and non-steady-state mass transfer reaction theory .
The situation of the liquid flow is described under the conditions of different number of nozzles in the tower and different liquid to gas ratio, through numerical simulation of specific conditions.
Mathematical model Simulation of air flow field RNG two-equation model [5] is proposed by Yakhot and Orzag.

By changing its speed can still achieve the transfer of energy and then generate electricity,although blade is short, and the wind area is reduced.In the study of the blade,high quality grid is the key.This paper discusses the fan blade meshing used ICEM CFD in the rotation of the basin.
Fig.1 The simple figure of scenery tower power generation device. 1.Model Building Using UG software to build the blade model.The fan blade rotation speed is faster, gas particle flow is more complex, so the meshing of flow field directly affect the results of the accuracy of the flow field numerical simulation.
(1) After putting the model into ICEM CFD, name its boundary,the model as shown in figure 3.
As shown in figure 4,5,fluid in the blade surface speed streamline is more well-distributed, calculating the residual curve also gets the convergence, its convergence precision is up to 1e-04(as shown in figure 6),explaining the grid quality is better, that has already reached the simulation requirements.
Fig.6 Residual figure. 4.Summary According to this model,Robust (Octree) method of five methods in ICEM CFD meshing is the best grid generation method,for more complex geometry it can also generate a better quality of the grid.Setting up necessary boundary layer grid to the overall quality of the grid has very great help,and widening the margin of the blades to help reduce the number of grid, so as to further simulation analysis of model lays a foundation.

The result is proved by CFD software.
Numerical simulation 4.1 Governing equation Continuity equation of incompressible fluid and RANS equation.
Figures below are the results of simulation.Fig.8 , fig.10 and fig.12 are the resistance coefficient , moment coefficient and lift coefficient in the astern maneuverability.
The model is much more stable in the straight maneuverability. 4.3 Results and Discussion Through the experiment and simulation , the resistance,lift force and moment of astern maneuverability and upright maneuverability are compared , the results show big difference.
And simulation will use the technology of dynamic mesh technique to text the moving model.

Design of impeller of centrifugal compressor for water-air engine Yun Wang1, a , Wei Zhang 1, b 1Department of Nanchang Hangkong University aircraft engineering institute, Nanchang 330063, China a wangyun66@163.com, b zhangwei19870923@163.com Keywords: air-water engine, impellor of centrifugal compressor, CFD.
With 3D design and a 3D CFD solver on it and analysis the results of numerical simulation.
Based on the studies of domestic and foreign aeroengine compressor and centrifugal water pump, this paper aims at the water-air engine, makes an aerodynamic design and research on the engine compressor impeller, and with the application of fluent software makes a numerical simulation of air and water model, according to whose results conduct an analysis and evaluation of the designed centrifugal impeller[2-3].
It can be seen from the results of numerical simulation and post-processing curve, that water-air impeller changes from the original conventional impeller to compound one with compressor and pump taken into account, which meet certain performance requirement.
[4] Tong Yueping, Zhang Shujia and Li Xianhua: Comparison of standard k-ε model and RSM model in 3D simulation in centrifugal pump (2008).

However, there was limited research using a CFD tool to predict the flow pattern and develop the flow pattern maps.
Properties of gas and liquid used in simulations.
(a) The computational mesh used in the simulations.
The simulations are performed in commercial CFD solver ANSYS Fluent and the simulations are run in a transient mode.
Therefore, the study also shows that CFD method is a feasible way to draw the two-phase flow patterns map.

Numerical Simulation on Aerodynamically Generated Injection Nozzle Noise Jianping YU1, a, Hong Zhu2.b, Shuping Chen1, b and Xiaosen Zhang 1, c 1 School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, China 2 Environmental resources Institute，Northwest Research Institute of Mining & Metallurgy ayujp@lut.cn, bzhh973201@163.com, cChengsp@lut.cn, dzhangxs@lut.cn Keywords: Numerical simulation, Injection Nozzle, CAA, Abstract.
Hence the results based on the CFD method are reliable and can be used to industrial applications.
The main purpose is verifying the accuracy of CAA theory model by comparing the simulation results and experiment data.
The comparation of noise between the simulated result and tested result :Fig.8 and Fig.9 shows the contours of noise which is calculated by numerical simulation.
Hence the results based on the CFD method are reliable and can be used to industrial applications.

Ltd, Hangzhou, China a zhangqunfeng@263.net Keywords: Hydro-generator; Temperature; Numerical simulation; Conjugate heat transfer Abstract.
Before this paper, the flow of dual radial ventilation system without fan for a hydro-generator has been simulated with parallel computational fluid dynamics (CFD).
Simulation Method Governing equations.
The hexahedral grids of different parts were generated with ICEM-CFD, the grids number of whole calculation domain is 1810,000.
Turbulence Modeling for CFD.

In the present study, the effects of ventilator geometries on the its performance were numerically simulated using the computational fluid dynamics (CFD) program.
Conclusions In the present study, the effects of ventilator geometries on the its performance were numerically simulated using the computational fluid dynamics (CFD) program.
Summary of numerical simulation of the internal flow in the turbo machinery [J].
Improvement of centrifugal fan design using 3d numerical simulation [J].
Performance optimization of centrifugal fan based on numerical simulation[J].

This requires the computational fluid dynamics (CFD) approach be utilized.
In this work, the widely recognized CFD package CFX was used for the objective.
To use CFX to solve the CFD problem based on Eq. (1-4), the boundary conditions are considered.
Mizo: Three-dimensional numerical simulation of viscous flow around circular cylinder, Journal of Shanghai Jiaotong University, Vol. 35 (2001), No. 10, pp. 1464- 1469
Fletcher: Numerical simulations of gas flow patterns within a tall-form spray dryer, Chemical Engineering Research & Design, Vol. 79 (2001), No. 3, pp. 235-248

The Eulerian-Eulerian model equations have been implemented in the commercial Finite Volume Method based FLUENT-ANSYS v6.3 CFD software using User-Defined Functions (UDF).
This paper focuses on both the process and simulation parameters and their influence on the macrosegregation formation.
Results and discussion The solidification of a ternary steel ingot (X34Cr15) with a relatively small size (diameter: 66 mm, height: 170 mm) was set up for CFD simulations (see Table 1).
All properties and parameters used for the simulation are listed in Table 1.
The CFD simulations predict a chance of having smaller crystals flowing first downwards and then upwards.