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For this reason that an experiment of hydrogen leakage has a high risk [1-4], a numerical simulation has become a very important alternative [5-9].
Therefore, numerical simulation method is feasible to hydrogen diffusion.
CFD modeling of large-scale LH2 spills in open environment[J].
Validation of CFD modelling of LH2 spread and evaporation against large-scale spill experiments[J].
FLACS CFD air quality model performance evaluation with Kit Fox, MUST, Prairie Grass, and EMU observations[J].

Therefore there is a widely industrial interest for the CFD (computational fluid dynamics) simulation of immiscible fluid.
The key to CFD simulation of immiscible flow is to track the free interface of the fluids.
Then the potential in CFD simulation of bubble aggregation and breakage was investigated by open source CFD platform OpenFOAM [5].
However, it is only the shape region in Fig. 2 and first-order upwind scheme (UDS) that can guarantee that CFD simulation is bound.
In most industrial CFD simulation, the PBM (population balance model) coupling Euler-Euler model is widely employed.

Comparison between the CFD simulation results and experimental data yielded an average difference in the bars temperature between -0.3ºC and3.5ºC.
The authors analyzed the same problem in the past [5,6], but without using CFD and with less accurate results.
Simulation Methodology The computational domain of the simulation is show in Fig. 2.The simulation consider a two dimensional domain, with a very narrow depth of 1 millimeterand with symmetry conditions in the front and back faces.The simulation is transient, with total time of 45 minutes and with time steps of 0.3 seconds and 0.5 seconds and it considers that the steel bars simply replace air at the time they enter in the experiment.
The average difference between simulations and experiments is in a range from -0.3ºC to 3.5ºC.
Temperature profile of bar8 Conclusion The authors made and validated a CFD simulation model to predict the temperature profile of steel bars.

Unstructured mesh and standard one - equation turbulence model, and Spalart-Allmaras selected in the simulation.
The computational simulations were done to obtain the lift, and drag coefficients using Numeca software.
UAV Kenyalang-I Characteristic Geometry setup and Mesh generation CFD.
Table 1 is the data obtained from the CFD analysis.
Fig. 2: CFD mesh, Static temperature, Total pressure, skin friction &Velocity vector view.

CFD Transonic Trajectory Predictions of three-store ripple release using Chimera method Ke Xi a, Chao Yanb Beihang University, Beijing, China acauchy86@163.com, bcauchy@ase.buaa.edu.cn Keywords: CFD, ripple release, Chimera method, unsteady, store separation Abstract.
The simulation of aerodynamically driven, moving-body problems, such as store separation, maneuvering aircraft, and flapping-wing flight are important goals for CFD practitioners .
Time step is chosen for the convergence of store-separation trajectory simulations with a 50 substeps.
In the simulations, the ejectors are defined fixed relative to the stores so that the ejectors will not create a rolling moment due to store motion.
CFD Wing/Pylon/Finned Store mutual interference wind tunnel experiment.

The new design structure i.e.solide catalyst and liquid in a stirred reactor has been simulated using computational fluid dynamics model (CFD).
The agreement between the expetiment and CFD have been testified in mutiple researches[1].
The result of simulation is worthy of trust and help evaluate the value of the effect of new designs.
Simulation method.
The axial flow is obvious in the simulation results.

Lin and Schohl [5] performed the analysis about the application of CFD in butterfly valve field.
The quality of mesh has important effect on the computational accuracy and efficiency of CFD.
The aerodynamic moment relationship based on the CFD software simulation in this paper coincides with the actual test data as the author’s work at literature [8].
[4] HE Zhiguo, MAO Genhai: Numerical simulation of 3D turbulence simulation in a cut-off valve and flow characteristics in pipes.
[5] Lin F., Schohl G: A CFD prediction and validation of butterfly valve hydrodynamic force.

Besides the experimental techniques by using wind tunnel in natural or reduced scale, CFD simulation method is more and more wildly adopted to optimize the aerodynamic performance of EV because of the great development of hardware and software [5~8].
The fluid dynamics simulations have been executed using the commercial CFD tools Fluent 12.0 in order to capture the characteristics of the flow field around concept EV models.
Guidelines for CFD Simulations of Ground Vehicle Aerodynamics[C].
Aerodynamic Drag Simulation and Validation of a Crossover[C].
The Appropriate Use of CFD in the Automotive Design Process[C].

CFD solver level: In CFD solver level, OpenFOAM provides various physic model, and all these solvers are described with DSL.
Parallel communication level: With the scale of the simulation mesh, parallel simulation of CFD application will be an inevitable choice.
We choose dambreak as our benchmark. dambreak is a simulation of dam break based on the volume of fluid (VOF) method.
OpenFOAM: A C++ library for complex physics simulations.International workshop on coupled methods in numerical dynamics. 2007: 1-20
Erosion-based dambreak simulation//Proceedings of the 2nd International Conference on Hydroinformatics, Zurich, Switzerland. 1996: 9-13.

In this paper, using the CFD experience can look the intake pipe gas flow as a 3-D compressed steady flow.
Adoption of CFD in the engine design process:present and future.
Design of cooling systems with computer simulation and underhood flow analysis using CFD.
CFD application in compact engine development.
CFD application in SI engine.