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Hydrodynamics Simulation of Gas-solid Flow Field in Conveying Vessel Yue Cuia, Hong Gaob, Jinsheng Sunc , Xu Chend School of Chemical Engineering & Technology, Tianjin University, 300072, China awillyoungcy@163.com, bhgao@tju.edu.cn, cjssun@tju.edu.cn, dxchen@tju.edu.cn Keywords: CFD; Pneumatic conveying; Gas-solid flow.
In this case, the gas-solid flow in the conveying vessel is studied through numerical simulation by FLUENT software.
The initial charge is about half of the volume and non-slip boundary condition is used for this non-steady simulation.
Simulation results show that the dead zone has disappeared and little particle remains.
This CFD model is based on the two-fluid approach combined with the kinetic theory of granular flow.

CFD Simulations and Experiments of Flow Fluctuations Around a Steam Control Valve.
Flow analysis in valve with moving grids through CFD techniques.
Improvement in a control valve geometry by CFD techniques.
Simulation Model for Compressible Fluid Passing Through a Pressure Control Valve. 7th Intl.
Simulation and Scientific Computing, (2008),p.456-459.

Effectiveness Validation of CFD Technology To verify the validity of CFD technology further, we compared the actual on-site photo and numerical calculation contours of the burst pipe inner and outer wall in the CO2 acid gas field, as shown in Figure 5-1 and Figure 5-2.
a The Actual Position of the Burst tee b CFD Calculation of Turbulence Intensity Distribution c CFD Calculation of Shear Force Distribution d CFD Calculation of Temperature Distribution Fig 5-1 CFD Verification Comparison Chart of the Burst Pipe Inner Wall Outer Wall Surface Verification CFD verification comparison chart of the burst pipe outer wall surface is shown in Figure 5-2.
a The Actual Position of the Burst tee b CFD Calculation of Turbulence Intensity Distribution c CFD Calculation of Shear Force Distribution d CFD Calculation of Temperature Distribution Fig 5-2 CFD Verification Comparison Chart of the Burst Pipe Outer Wall Figure 5-1 and Figure 5-2 show that the position of burst pipes is actually at low speed vortex zone, it is highly consist with the corrosion location prediction results based on CFD technology in section 4.3.
Summary 1) In the synergistic effect of low-speed vortex, CO2 corrosive media, liquid water accumulation, heat-affected, turbulent flow patterns and so on, it is easy to exacerbate corrosion thinning on pipe inner wall surface in low-speed vortex zone of object, induce burst pipe failure accidents, there is a huge security risk. 2) The calculation of using CFD numerical simulation technology is highly consist with the actual failure cases.
As you see, it is effectively to predict the location of the typical pipe fittings corrosion of gas gathering pipeline, guide inspection on-site, promote the detection efficiency, ensure the safety of energy transportation. 3) On the basis of the universal law obtained from using CFD simulation technology, we can consider to carry out secondary development technology in follow-up, to realize the research of the relevance between flow field simulation and the corrosion rate.

However, CFD (Computational Fluid Dynamics) became an important tool to simulate diesel working process.
In this paper, multi-dimensional transient numerical simulation of working process of diesel engine was done based on computational fluid dynamics.
The simulation analysis of the flow characteristic in diesel engine and was carried by using CFD software.
In numerical simulation, the rationality of the meshing directly affects the accuracy of the calculation results.
Analysis Result of Simulation.

F.L.Chen et al[3] applied a CFD technique CFX to simulate the smoke’s propagation in Gong-Guan subway station in Taipei.
The CFD model computes the density, velocity, temperature, pressure and species concentration of the gas in each cell.
The simulation results are illustrated in Fig.4 to Fig. 6.
The simulation results show that few areas exist which their temperature reach 25C˚.
[7] Y.L.Na, The experimental and CFD simulation study of the subway fire and ventilation in subway station, Doctor thesis, TianJin University, TianJin (2003)

The simulations are validated against the experimental results regarding fiber’s strength.
Zhou[3] applied CFD method to view detail flow information in splicing chamber and compared flow field distribution for various cases with different designs.
Simulation model and boundary condition Control Equation.
Air Flow in a Pneumatic Splicer by CFD.
The use of visualisation and simulation techniques to model the splicing process.

Hydraulic Circulation Test and CFD Analysis of Prestressed Cementing Unit Earth Anchor Ding Li College of Mechanical Engineering, Yangtze University, JingZhou 434023, Hubei, China email: liding001@126.com Keywords: Thermal production well; Earth anchor; CFD; Differential pressure; Discharge coefficient; Circulatory test.
The CFD Analysis The Flow Channel Model of Earth Anchor.
The flow channel inner structure diagram were shown in figure 1. 1-source line; 2-the above anchor joint; 3-throttle nozzle; 4-central tube; 5-the under anchor block joint; 6-export pipeline Fig.1 Diagram of flow channel inner structure of anchor-unit The Data Processing of The Simulation Results.
Fig.2 Relationship curves of flow-differential pressure, flow-flow coefficient of Φ178 anchor with Φ37 nozzle computed by CFD Circulatory Test Test Principle.
[3] Hongjun Zhu, Yuanhua Lin, Longhan Xie, Fluent12 Fluid Analysis and Engineering Simulation, Tsinghua University Press, Bejing, 2010

Also result of moment pitching (see Figure 5) are trend similar both in CFD and Mat-Lab.
For the translation forces 135 degrees (see Figure 6) trend curves are similar but RAO curve trend experiment higher then CFD and Mat-Lab.
Experimental model test and CFD analysis shown good agreement both on 90 and 135 degrees of heave.
Conf. on Ship and Shipping Research, NAV, Venice, Italy [3] Bridges, T.J, (1982), A numerical simulation of large amplitude sloshing, Proc. of the 3rd Int.
Applied Ocean Research 20, 337-355 [6] Kim, Y, (2001), Numerical simulation of sloshing flows with impact load.

Using ANSYS-FLOTRAN CFD software, the finite element simulation is conducted by a series of procedures, such as two-dimensional model building of fluidic gyroscope, meshing, loads applying and equation solving.
In this paper, we use the FLOTRAN CFD analysis of ANSYS software to have a comparative study in the two different nozzle dimensions, so as to attempt to find a better nozzle dimension which can improve the resolution of fluidic gyroscope.
Solve with Finite Element Method The FLOTRAN CFD analysis of ANSYS software is an advanced tools used to study two dimensional and three dimensional flow fields, the simulation typically comprises modeling, loading and solving [3-4].
Select FLOTRAN CFD analysis of ANSYS software.
Wang: Numerical simulation of practical engineering in ANSYS (Northwestern Polytechnical University Press, China 1999)

To study the blade-wake interaction of vertical axis tidal turbine (VATT)，particles were placed in the flow field to trace blade wake during numerical simulation.
Numerical simulations were conducted utilizing Euler-Lagrange model.
On the other hand, CFD methods can be divided into two categories: one based on Euler model and the other based on Euler-Lagrange model.
So this paper used the CFD method based on the Euler-Lagrange model to capture the blade wakes.
After blades drill through, the wakes would distortion and curl up to form big vortexes. 4.Conclusion In order to understand blade-wake interaction of VATT, place particles to trace blade wake during numerical simulations, numerical simulations were conducted with Euler-Lagrange model.