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Impacts of the improvement on the SiC CVD modeling are presented in computational fluid dynamics (CFD) calculations, manifesting the significance of an accurate database.
Computational Fluid Dynamics (CFD) Calculations.
CFD calculations were employed to analyze an impact of thermochemical properties on the deposition rates of SiC CVD.
An impact of the improved thermochemistry on the SiC-CVD simulations at two different pressures, 100 mbar and 1 bar, is shown in Fig. 2.
At low pressure (100 mbar), both simulations show small contributions from CH3SiH2SiH, giving no significant difference between the two databases.

Carsonb School of Engineering, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand athomasarchbold3@gmail.com, bjkcarson@waikato.ac.nz Keywords: Computational Fluid Dynamics (CFD), Cyclone Separation, Multiphase Flow Modelling Abstract.
Because of the opposing geometry of the kernel and shell particles, a new framework is derived using CFD simulations to predict the drag coefficient of the shell particle as a function of orientation and Reynolds number.
All simulations of the particle behaviour were executed using a version of ANSYS Fluent 17.0.
The drag coefficients obtained from simulations were approximated by a function of best fit (Eq. 24).
The maximum percentage difference between the simulation results and the approximated model is 23.7%.

The implementation of developed procedures called User Defined Functions (UDFs) working interactively with Fluent CFD code, and a dynamic mesh method, allows to treat the problem with its specific and complex boundary conditions.
Modeling could be used to simulate these complex mechanisms, it allows saving much time and money, and yields to interesting results that could be exploited to optimize the process.The implementation of developed procedures called User Defined Functions (UDFs) working interactively with Fluent CFD code [3], and a dynamic mesh method, allows to treat the problem with its specific and complex boundary conditions.
Fig. (2) Simulation of four layers formation by laser cladding, using the VOF method Dynamic mesh approach.
Fig. (3) Sequences of butt joint formation We consider in our simulation the calculation field with its dimensions as given on figure (4).
The UDFs were used interactively with the CFD Fluent code, during the calculation process.

Computational Fluid Dynamics (CFD) was used to analysis flow state and sine camber of tube influence on the heat transfer and flow.
This paper applied computational fluid dynamics (CFD) technology in research of convective heat transfer and flow resistance characteristics in sinusoidal corrugated tube[1].
Fluent, the commercial software of CFD was used to simulate the convective heat transfer and flow resistance characteristic around sinusoidal corrugated tube with different sine camber e.
Numerical simulation and the theoretical analysis with field synergy principle indicate that the effect of field synergy is poor in the smooth tube, which is opposite to that in sinusoidal corrugated tube.

The CFD simulation shows that the flow field is symmetrical during the inlet and outlet, as shown in Fig. 5.
CFD simulation of parylene deposition chamber. 3.
The parylene TGA inspection, CFD simulation, and modification of parylene deposition chamber and water-proof testing improved uniformity by 6% in the nanometer scale to meet new applications of parylene, such as the delamination layer of OLED, TSV, and water-proofing mobile phones.

The method in this paper the efficiency and reusability of the flow simulation algorithm be significantly improved.
We put forward a specific example to demonstrate the application of this method to groundwater simulation.
Here, we show the topology-based, including groundwater flow visualization numerical simulation validation of 2000 (a) (figure 3) and groundwater numerical simulation forecast of 2008 years (figure 3 (b).
Instances of groundwater simulation for Beijing, China Conclusion The common development of the extracting rules is important flow phenomena, improve computer simulation efficiency and reduce repeated work.
Tan, “Streamline Construction and Application in CFD Based on Velocity Decomposition Model of Fluid Flow,” Journal of computer-aided design & computer graphics, 2002,14(11),1005-1009.

To analyze the flow field in the valve, numerical simulations are also performed in the paper.
Fig.2 Model of Flow Domain in the Vent Valve In order to study the flowing situation, the commercial computational fluid dynamics (CFD) software FLUENT is introduced into this paper.
To improve the precision of the computation, the RNG k-εviscous model is introduced into the simulation.
Numerical simulation is conducted by using the CFD software FLUENT, and the field parameters such as pressure and velocity are studied thoroughly which will do great help to the research of the vent valve.
Dynamic simulation of 3D flow field of train damper.

Numerical Simulation of Interior Flow Field of a Variable Thrust Rocket Engine Yue Chun-guo1, a, Chang Xin-Long1, b, Yang Shu-jun2, c, Zhang You-hong1, d 1Xi’an Research Inst. of Hi-Tech Hongqing Town, Xi’an, China, 710025 2203 Institute of China North Industries Group Corporation, Xi’an, China, 710065 aemail: wsgangzi802 @qq.com bemail: xinlongch@sina.com.cn cemail: chuangshawudi@etang.com demail: zyhnpu@hotmail.com Keywords: Variable thrust rocket engine; Numerical simulation; Flow field; Fluent Abstract: With the support of powerful calculation ability of computer and Fluent of CFD software, integrative simulation research of the variable thrust liquid propellant rocket engine was developed.
Numerical simulation of interior flow field of a variable thrust rocket engine with flux-oriented injector was done.
Based on the previous research, combustion flow integrated simulations of variable thrust engine were developed.
Mathematical model[4] Eulerian-Lagrangian approach was adopted in the simulation of liquid rocket engine spray combustion process.
[4] Zhao Jian-xing: Numerical simulation of combustion.

Numerical simulations are one way to obtain a better and more detailed understanding of the chemical vapor deposition process of silicon carbide.
Using numerical simulations, e.g. computational fluid dynamics (CFD), is one way of obtaining this understanding.
The chemical reaction models are implemented in commercial CFD software and tested in a 2D geometry of a horizontally oriented CVD reactor.
Alternatively, as is done in the simulations here, a deposition model that completely separates the different molecules can be used.
Experimentally, at the conditions used in the simulations, silicon limited growth is expected, at least for C3H8 as carbon precursor.

The optimization of the entrained flow gasifier is the critical thing for the development of entrained flow gasification technology.This paper presented a three-dimensional computational fluid dynamic(CFD) simulation for a better understanding of the cold condition flow characteristic in an entrained flow gasifier.
It is very necessary for investigating the flow in the entrained flow gasifier and a series of simulation were completed to study the influence of various spraying angles, diameter and outlet velocity of nozzle on the gasifier flow and mixing condition.
Tab.1 The operation variable during the simulation operation variable unit value θ-the spraying angle of nozzle [°] 4.5 13.5 22.5 d-the diameter of nozzle [m] 0.12 0.2 a 0.3a v-the injection velocity of nozzle [m/s] 50 75 100b a: only in the condition that θ=4.5°.
Fig. 5 a) Time scale of integral vortex b) Length dimension of integral vortex (d=0.12 m v=75 m/s z=1.7 θ=4.5° 13.5° 22.5°) Conclusion A computational fluid dynamics simulation of the cold condition characteristic in an entrained flow gasifier was presented.