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NUMERICAL SIMULATION AND ANALYSIS OF 3D FLOW FIELD IN NEW DIFFERENT-SPEED MIXER Zhang Yalan1,a ,Wu Yun2,b 1Department of Computer Engineering, Guangxi University of Technology, Liuzhou 545006, China 2Applied English 093, Guangxi Yulin Normal University, Yulin 537000, China a436068934@qq.com, b356556631@qq.com Keywords: different-speed mixer; analysis of flow field; numerical simulation Abstract.
A simulation model of the flow field in the different-speed mixer was built based on UG software in this paper.
(2)The true flow condition of the material in flow field was obtained by numerical simulation of agitator flow field which done by Fluent analysis software.
Study Some Problems of Numerical Simulation Method [D].
Computational Fluid Dynamics Analysis--Principle and Application of CFD software [M].

Gambit 2.2 was used to construct the mesh and the general-purpose commercial CFD code Fluent 12.1 was selected for the solution of the steady-state conservation equations adopting the laminar formulation.
Fig.1 Schematic diagram of the 2D representation of the membrane reactor used in the CFD model.
In the present work, the two-step hydrocarbon oxidation mechanism by Westbrook and Dryer [9] which was modified by Andersen et.al. [10] is used for the calculations of the reaction kinetics, since this scheme is directly available as default in the commercial CFD code Fluent.
The symmetry line length located inside the feed zone and the permeate zone is 3cm inside each zone and it is fixed in all simulations.
L.; Giselsson, T.; Glarborg, P., Global Combustion Mechanisms for Use in CFD Modeling under Oxy-Fuel Conditions, Energy Fuels, 23(2009) 1379–1389.

Based on the finite volume method and the pressure-velocity coupling scheme of the SIMPLE algorithm with the standard k-ε turbulent model, a CFD software was used to solve the Navier-Stokes equations to figure out the pressure in the bearing gap and the housing gap.
Analytical Approach Based on the finite volume method, this study utilized the laminar flow module of the CFD software, FLUENT, to solve the three dimensional Navier-Stokes equations to compute the pressure of air flow in the bearing gaps and the housing gaps in an aerostatic spindle.
In order to simplify the numerical simulation, the following assumptions were made for the flow field: (1).
Simulation models (a) (b) Fig. 1 (a) Cross section of the aerostatic spindle module.
Rao: Simulation based on FLUENT and experimental research of porous aerostatic bearing, Master Thesis, Harbin Institute of Technology, China (2006) [3] J.M.

Results are discussed on the basis of thermodynamic calculations and numerical simulations of the temperature distribution in the crucible.
Fig. 2 : Numerical simulation of the temperature distribution in the sublimation chamber versus carrier gas, for a fixed T high.
The other properties and phenomena considered in these simulations are described in a previous work [1].
Close-up of simulation results inside the sublimation chamber are shown in figure 2.
Ellison, thesis, Linköping university, (1992) [4] CFD-ACE, CFD Research Corporation, Huntsville, AL 35805, USA, http://www.cfdrc.com/

Numerical Simulation of Scouring Erosion Characteristics for Electric Submersible Pump Impeller CHEN Si2,b, WANG Zun-ce1,a 1Northeast Petroleum University,Daqing,163318,China 2Northeast Petroleum University,Daqing,163318,China airaqiraq@126.com,bWangzc@nepu.edu.cn Keywords: Electric Submersible Pump; discrete phase model; particle impact erosion; Numerical simulation; Abstract.
This paper shows the numerical simulation of the problem that electrical submersible pump impeller is vulnerable to particle impact erosion in the water under the condition of the water injection of the same wells in oil field.
This simulation is based on Fluent of CFD software, which has built a geometric model of electric submersible pump impeller flow field, and given the calculation of the internal flow field of the impeller, and showed the solution of the motion track of the particles in the turbulent by the way of discrete phase model and random orbit, and calculated the erosion by the micro cutting model by particless, and compared the field test data with the simulation results which proved the reliability of numerical simulation method.
Numerical simulation assumption: the solid particles are spherical shape.
Then on the specific wear area both of the blade of the impeller and the whole area of the up shroud appear serious wear, which has a little difference from the outcome of the simulation.

Numerical Simulations In total 3 designs of the air fin where used to perform 2D numerical simulation using the commercial software Autodesk Simulation CFD 360.
Fig 4 Simulation domain: a) no straight section; b) 2.5 [mm] straight section; c) 7.5 straight section Fig 4 shows the domain boundary conditions used.
Data given by the simulation software isn’t in a form that permits us to extract directly the convection coefficient and the friction coefficient.
Here the problem arises from the fact that the simulations are 2D and not 3D.
Nagi, “Numerical Study of Corrugation Amplitude Influence of a Wavy Fin in Overall Performance of a Compact Heat Exchanger,” in ACME 2014, (2014) [9] Autodesk Simulation CFD 2014, “Help: SST K-Omega Turbulence Models.”

The work presented here, deals with numerical simulations performed in a tube-in-tube heat exchanger to study and compare flow characteristics and thermal performance of a tube-in-tube heat exchanger using water and Al2O3/water nanofluid.
In the present investigation, numerical simulations have been performed in a tube-in-tube heat exchanger by a local element-by-element analysis utilizing e-NTU method, to study and compare flow characteristics and thermal performance of a tube-in-tube heat exchanger using water and Al2O3/water nanofluid.
Fig. 2 Variation of heat transfer rate Fig. 3 Variation of hot fluid temperature Fig. 4 Variation of cooling water temperature Fig. 5 Variation of pressure drop The heat exchanger was also tested using computational fluid dynamics (CFD) software FLUENT.
A model was created (Fig. 6) and temperature contour (Fig. 7) was arrived for the same operating conditions used in the numerical simulation.
CFD results were in good agreement with those of numerical simulation.

Now, long flexible deepwater riser vortex-induced models can be divided into: empirical models, mixed models and CFD models.
The development of computer provides favorable conditions for the research and application of CFD, and makes the numerical method be widely used [3,4].
Table 1 Parameters of model riser riser length 1500[m] Elastic Modulus 207G[pa] outer diameter 0.3239[m] shear modulus 79000[pa] inner diameter 0.285[m] Material Density 7850[kg/m*3] Table 2 VIV response parameters uniform current velocity[m/s] 0.2/0.4 1.0 1.0 0.9 0.05 According to Fig.2, the relation curves of reduced amplitude and reduced speed，TTR cross-flow vibration lock-in range is：4<<6.3，thus in this paper, velocity 0.2m/s,which in lock-in range, and velocity 0.4m/s which is outside lock-in range are selected as simulation speeds .

China ajjliouu@163.com, blichx@buaa.edu.cn Keywords: Turbulence model, Hypersonic, CFD, Compressible Abstract.
Results and Discussions Numerical simulations are carried out for a hypersonic flow over a flat plate in order to optimize the present model’s coefficients and validate the model and the procedure developed in the previous sections.
Liu: Development of High-Mach-Number RANS Turbulence Model and Numerical Simulation of Hypersonic Flows (PhD.
Wilcox: Turbulence Modeling for CFD ( DCW Industries Publications, 2nd edition, USA 2000) [12] G.T.

These experiment data are very expensive no matter from the prototype experiment or computer simulation, so finding out the global model of the existing CCP etcher with less trials is necessary.
Typical etch fabrication process modeling and optimizing Xu and etc. have studied on a dual-frequency CCP etch chamber process, a 2D axisymmetric model of 300mm etcher is built in CFD-GEOM/CFD-ACE+, a popular multi-physics simulation software in semiconductor industry.
By orthogonal design, a group of plasma simulation experiments are carried out.
OPTIMUS software were adopted for the process modeling and later on RBF, Kringing and least-squares models are compared based on the simulation experiments data.
And it has been shown that error of the optimization and simulation result is less than 4%, it can give engineers good advice to modify etch input parameters.