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In order to study the dynamic changes of the internal flow field physical quantities in the hydraulic buffer of a special equipment, based on the Computational Fluid Dynamics (CFD), a three-dimensional incompressible and viscous model under unsteady condition is created.
Comparing the pressure of working chamber I from simulations with experimental data (as shown in Fig 9), it can be found that: in the Early period of the simulation (0~10ms) and the Later period of the simulation (40~60ms), simulation result is essentially the same as experimental data, but simulation result is slightly larger than experimental data as a whole.
Fig.8 Distribution of lowest negative pressure points Fig.9 Comparison of simulation result of the pressure of working chamber I with experimental data Conclusions In the simulation process in this paper, hydraulic buffer internal cavity is filled with buffer solution, compressible gas was replaced by incompressible liquid, so that the calculated pressure values by simulation were higher than the experimental data as a whole.
[2] Zheng Jianguo: Numerical Simulation of Flow Field in a Gun Recoil Mechanism.
[5] Wang Fujun, in: Computational Fluid Dynamics Analysis--Principle and Application of CFD software, Tsinghua University Press, Beijing of China(2004).

For the numerical solution it was used the Computational Fluid Dynamic (CFD) commercial code FLUENT®, based on the Finite Volume Method (FVM).
The computational domain (OWC coupled to a wave tank) was created and discretized in GAMBIT® software, while the numerical simulations were carried out by means a computational modeling implemented in the Computational Fluid Dynamic (CFD) commercial software FLUENT®, which is based on the Finite Volume Method (FVM) [7,8].
In the simulations of this study, two different phases are considered: air and water.
All numerical simulations were carried out in a computer AMD Athlon 2 Core with 3.0Gb of RAM.
To reduce the simulation time the parallel processing technique was adopted [6].

From these simulations, we can get the date of natural lighting and ventilation, which can be used to guide the design process and thus the weakness of earth-sheltered architecture can be solved by using the above means.
The chat of light-pipe system and the simulation diagram and the simulation diagram of natural lighting of the daylighting underground after using light-pipe systemin building one and two layers 2) Natural ventilation The earth-sheltered architecture all around is closed, so natural wind is hard to be brought into the room from the outside and so do the ventilation indoors.
The Fig.10 shows the good effect of natural ventilation of the Chongqing Empirical Study Center of Building Energy Conservation which is simulated by CFD.
The Fig.11 shows the good effect of natural ventilation caused by heat pressure from the Daylighting atrium which is simulated by CFD [7] , and the wind speed reaches 3m/s at the wind outlet of the Daylighting atrium.
Two-step Optimal Design Method Using Genetic Algorithms and CFD-coupled Simulation for Indoor Thermal Environments [J].Applied Thermal Engineering, 2007, 27(1):3-11.

The NG dispersion for LNG releasing on water was presented by this paper, and DNV’s UDM model and CFD model were combined as a new model, which was validated credibility by simulating a case.
The results of numerical simulation were treated by TECPLOT software, and then a 3D concentration of NG can be shown.
Numerical simulations (1) Case description Atmospheric stability is level D.
Computational Fluid Dynamics-CFD software principle and application[M].
Simulation Study on Instantaneous Release of LNG[J].

In numerical simulations such unsteady flows require a special treatment.
Distinguishing between numerical dissipation and turbulence decay is another problematic topic in CFD.
As an example, a comparison of the vorticity as obtained in the experiment and from CFD calculations, as performed by the Department of Transport Aircraft, is shown in Fig. 4.
This highlights the need for proper validation of CFD codes.
The two dimensional PSP images have been mapped to the three dimensional CFD grid of the model.

This paper focuses on the effects of helium injection on the cooling performance of glass fiber cooling unit in high-speed optical fiber manufacturing, and it will present the numerical investigations of glass fiber cooling process by using the flow and convective heat transfer modeling and CFD computations.
A multi-propose commercial CFD software, FLUENT 6.3, has been employed in solving the governing equations for continuity, momentum, and energy for the numerical simulations of flow and temperature fields for both cooling gas and fast moving glass fiber.
All the simulations used the block structured computational mesh and the total number of quadrilateral cells is approximately 125,000.
Note that the species transport of two gas components is also included in the simulations.
Due to large temperature variation, temperature dependence of thermal conductivity and viscosity for the cooling gas is also considered in the simulations.

In this paper, the hydraulic efficiency and circumferential force fx are selected as evaluation parameters , cascade CFD models are built and calculated with the different modified angles.
Fig.4 Inlet flow angle modification influence diagram Analysis of Outlet Flow Angle Modification It is similar to the inlet flow angle calculation that the CFD model is built and calculated.
Mechanics and Simulation of Geared Turbodrill.
CFD Simulation of Multistage Turbine Flow Field.
Computational Fluid Dynamics-Principle and Application of CFD Software.( China Tsinghua University Press, Peking,2004) In Chinese

The research will get a more effective ventilation model by comparing the simulation results.
It is further to verify that the simulation method is feasible, and the conclusions obtained on this basis are acceptable. 1.
According to the specific characteristics of the anatomy laboratory, I will simulate five ventilation modes with CFD technology, and then get a better ventilation mode by comparing the simulation results and the test results and provide certain reference significance for improving the air quality of the anatomy laboratory. 2.
Model V will be recalculated, and the comparison of simulation results and the measured results are shown in figure 9~10.
Figure 9 The comparison of simulation results and measured results of wind speed Figure 10 The comparison of simulation results and measured results of formaldehyde concentration 5.

In addition, we also carried out flow visualization and computer simulations regarding the movements of thermo-fluid inside a display cooler.
CFD Analysis.
In the present study, we simulated a steady-state velocity and temperature field of a full-scale display cooler without partition plates inside a cooling compartment, with a commercially-available CFD program (Fluent 6.2).
In this simulation, the standard k-ε turbulence model and segregated solver are used.
According to the results of the CFD simulation, uniform temperature distribution inside the chamber could be substantially influenced by the entrainment flow from the bottom-plate inlet.

In the field of refrigerators, many scholars have applied the CFD software to study the refrigeration performance.
The sketch map of four kinds of temperature distribution Simulation Results of Temperature Field and Analysis The simulation results of temperature are shown in figure3.
Simulation Results of Velocity Field and Analysis The distributions of velocity field are shown in Figure4.
[2] Cortella G,Manzan M,Comini G.CFD simulation of refrigerated display eabinets[J].International Journal of Refrigeration,Vol.24, No.3, 2001, pp.250-260
Moureh; Numerical Simulation of Air Flow and Heat Transfer in Domestic Refrigerators.Journal of Food Engineering, 2006, pp146-152.