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There are many CFD commercial software such as PHOENICS, CFX, STAR-CD, FIDIP and FLUENT, etc..
Numerical simulation of the porous needs the characteristics and theoretical porous medium [1][2].
The flow speed simulation filled contours of fiber porous material are shown in Fig. 3.  
Simulation results show that the greater the porosity of porous, the X-axis speed is.
Song CFD simulation of the effect of upstream flow distribution on the light-off performance of a catalyticconverterEnergy Convers.

Gas diffusion is a complex process and CFD has provided the construction and operation modes to make the simulation of the gas diffusions for complex geometries feasible[1,2].
The height of the chimney is set as 30 m during the process of the simulation.
Summary By the application of the CFD software, simulation of the diffusion process of the flue gas in the atmosphere is realized and it no longer stays on the level of the theoretical analysis, which makes the flow field intuitive.
Also, the applicability of the CFD software in the gas flow field is fully demonstrated.
Ruan, CFD numerical simulation of gas diffusion, Journal of Safety and Environment. 26 (2002) 21-23

In present work CFD simulations are carried out using ANSYS FLUENT software using Volume of Fluids (VOF) method.
The CFD geometry is shown in Fig. 1.
Delgado, CFD simulation of bubble column flows: An explicit algebraic Reynolds stress model approach, International Journal of Multiphase Flow, 66 (2014) 11-25
Joshi, CFD simulations of bubble column reactors: 1D, 2D and 3D approach,Chem.
Tanga, Three-dimensional CFD–VOF–DPM simulations of effects of low-holdup particles on single-nozzle bubbling behavior in gas–liquid–solid systems.

Wind tunnel test and CFD simulation are widely used in the researches on the performance of railway wind-break wall and some important results are summarized.
CFD (Computational fluid dynamic analysis) simulation test research.
The scholars of Central South University such as JiangCuiXiang and LiangXifeng [9] used new type ultra-thin railway wind-break wall as test object to do the CFD simulation.
The current study of wind tunnel test and the CFD simulation test are to be improved.
Secondly, train was set as static processing in the CFD simulation in many cases without considering the train running speed.

Influence Analysis of Blade Fracture on Hydrodynamic Performance of Ducted Propellers Based on CFD Li Jian OU1, a, De Yu LI1, b, Wei Zhang1, c 1School of Civil Engineering and Transportation, South China University of Tech., China; aljou@scut.edu.cn, bdeyu@scut.edu.cn, c241222462@qq.com Keywords: CFD, Ducted Propeller, Hydrodynamic Performance Abstract: The numerical model of the unsteady flow field of ducted propellers is based on CFD (computational fluid dynamics).
Introduction CFD (computational fluid dynamics) is widely applied in the numerical simulation of flow field.
Because of its adaptability and accuracy, CFD gradually becomes an important tool in hydrodynamic research.
Compared with experiment research, numerical simulation has advantages of low-cost and short-period, and can obtain complete data and simulate the measurement of various data in practical operation process.
Hydrodynamic Performance Prediction of Some Propeller Based on CFD[J].

The different AOA (Angles of attack) 0̊, 6̊ and 10̊ are considered with Re = 3.6×106 for the supersonic flow simulations.
L A Schiavetta (2003) [10], carried out CFD simulation for transonic flow over the 65 degree sharp leading edge delta wing for M∞ = 0.85 and Re = 6×106 at 18.5 and 23 degrees.
The Reynolds number considered for the simulations was Re=3.6x106.
Fritz: Analysis of Transonic Flow on a Slender Delta Wing Using CFD, AIAA Paper 2006-3171. (2003) [11] N.
Allen: DELTA WING AERODYNAMICS – Requirements from CFD & experiments, Integrating CFD and Experiments, Glasgow, UK. (2003) [14] V.

This work used ANSYS software to calculate the aerodynamics parameters generated by main rotor with help of CFD tools using the remarked ideal of simulation in [2-7].
CFD b.
CFD Theory a.
Natural Frequency Fig. 7 Modal method Summary A steady CFD-CSD coupled simulation was used to analyze the strength of the designed main rotor.
For the future work, the durable designed main rotor was analyzed with a fully CFD-CSD coupled simulation.

Numerical Simulation of Quenchant Flow Characteristics in Large Quench Tank Hui Sun College of Mechanical Engineering, Shanghai Dianji University, Shanghai, China sunh@sdju.edu.cn Keywords: flow field, large quench tank, numerical simulation Abstract.
The computational fluid dynamics (CFD) technique is employed to predict the flow of quenchant in a large quench tank.
In this work, the flow field in a large quench tank is predicted by adopting CFD technique.
In order to make the CFD analysis manageable, a number of simplifying assumptions are made.
CFD modeling of quench tank agitation, Proceedings of the 10th Congress of the IFHT, Brighton, UK, (1996), 655-669

River flow with submerged foliage vegetation in straight and rectangular cross-sectional channel is numerically simulated through a vertical two-dimensional CFD model.
Refined simulation of flow characteristics within and above the vegetation canopy will improve insights into how biological and physical processes combine to yield stable, equilibrated ecosystem and landform.
A k-w model in the commercial CFD package, Ansys-Fluent is selected, with VOF method treating the flow surface.
Simulation for a specified velocity and leaf density (leaf number per stem) is performed.
Simulation at the oncoming velocity 0.1m/s, the leaf density 8/stem is performed.

We used CFD numerical method to investigate the influence of width, height, outlet size and the angle of photovoltaic plate on the performance of PV channel based on the summer typical meteorological parameter.
Wang Hanqing summarized three common simulation methods of the double curtain wall (meshed network simulation, computational fluid dynamics method and building energy simulation).He thought before the design of double curtain wall, simulation analysis should be carried on [1].
This paper presents influence of width, height, outlet size and the angle of photovoltaic plate on the performance of PV channel based on the Shanghai summer typical meteorological parameter by CFD method.
In the simulation, convection heat exchange has adopted as a boundary condition of external surface.
Reference [1] Hanqing Wang, Yu Chen, Guangxiao Kou and Zhiyong Wang, Progress on Study of Double-Skin Facade Simulation Building Energy & Environment, 2008,Vol.27 No.5 19-22 (In Chinese) [2] Hanqing Wang, Fengfeng Wang, Guangxiao Kou and Zhiyong Wang, Simulation Study on Thermal Performance of Mechanically Assisted Ventilated Double Skin Façade Building Energy & Environment, 2011,Vol.31 No.3 75-77 (In Chinese) [3] Guixian Zhang, Lidong Chen and Dong Ding, Heat transfer analysis for double skin façade of building based on CFD fluid model Construction & Design For Project 2003,Vol.9 4-7 (In Chinese)