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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

The model of exhaust silencers discussed in this article is fluid-solid interaction model and this paper uses the CFD software for numerical simulation of the model.
Mesh generation technology is an important part of computational fluid dynamics, and the accuracy of CFD calculations relies heavily on the quality of the generated mesh.
We can see that mesh generation technique is one of the key technologies in using CFD as effective tools in aerodynamics works.
This proves that numerical simulation methods can be used in silencer structure simulation and optimization.
CFD software principle and application ( Tsinghua university press, Beijing 2004).

The simulation analysis results will be compared and validated by practical spray coating experiment, so as to determine the reliability of simulation to implement the spray flow field simulation technique for large area uniform spray coating.
This study uses computational fluid dynamics (CFD) software to analyze the spray characteristic on the flow field distribution and flat plate coating in the case of fixed ultrasonic vibrator, vibration wave and array ultrasonic nozzle arrangement.
The simulation analysis results will be compared and validated by practical spray coating experiment to determine the reliability of simulation, and to implement the spray flow field simulation technique for large area uniform spray coating.
Research Methods This study uses three-dimensional CFD, finite volume method and SIMPLE algorithm and first order upwind difference method for numerical analysis, and uses standard turbulence model for related simulation calculation.
Point-6 31.53 26.107 20.77% 31.49 28.255 11.45% Point-7 29.26 26.002 12.53% 28.84 30.474 5.36% Point-8 31.39 24.834 26.40% 31.36 27.883 12.47% Point-9 31.96 *** 0.00% 32.16 27.679 16.19% Average value 31.7 25.51 24.28% 32.42 27.36 18.89% *** SEM fails in measurement Conclusion This study aims at the influence of the parameters of ultrasonic nozzle height, substrate traveling speed and PITCH on the spray coating film thickness distribution in the array ultrasonic atomization spray coating process equipment technology, and uses CFD computer simulation analysis technique and compares atomization flow field prediction simulation analysis result with real machine test, to build a reliable computer simulation analysis model for array ultrasonic atomization spray coating process.

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].

Influence for Brake Torque of Hydraulic Retarder with Shape of Circulation Circle Chu Yaxu1,a, Lv Jinhe2,b 1East campus of Beihua University in Jilin city ofJilin province,China 2East campus of Beihua University in Jilin city of Jilin province,China acyx_1964@sina.com,b350573500@qq.com Keywords: CFD; the RNG turbulence; the shape of circulation circle; numerical simulation Abstract.
Based on CFD software platform, numerical simulation of 3-D with the internal characteristic of hydraulic retarder with different shape of circulation circle was simulated, and the RNG turbulence was adopted.
One of the main factors that influent the performance of hydraulic retarder was the shape of circulation circle, high braking torque can be gotten with the proper shape of circulation circle. numerical simulation was simulated with different shape of circulation circle based on the CFD software platform.
setting the calculation target according to the convergent curve is difficult to judge whether it achieve convergence, Because the simulation calculation of hydraulic retarder are unsteady calculation, Because the simulation calculation of hydraulic retarder are unsteady calculation, monitoring the pressure of the oil inlet and rotor torque changes in the view of convergence curve.
[5] He Ren,Yan Jun. 3D Numerical Simulation and Performance Prediction of Hydraulic Retarder[J].Machine Tool & Hydraulics,2009(3):250-253.

Underfloor Air Cavity Created from Special Shaped Units and Different Intensity of Outdoor Wind Flow Tomáš Renčko1,a* and Anna Sedláková1,b 1Technical University of Košice, Vysokoškolská 4, 042 00 Košice, Slovak Republic atomas.rencko@tuke.sk, banna.sedlakova@tuke.sk Keywords: Underfloor Ventilation, Special Shaped Unit, CFD Simulation, Wind Flow Abstract.
To assessment the airflow in the air cavity the recently often used CFD simulations can be employed.
Conclusion The paper aims to highlight the possibilities of CFD computer simulation programs to assess airflow in underfloor cavities.
Šikula: CFD simulation of ventilated air cavity.
Sedláková: CFD Model of an Underfloor Air Cavity Created from Special Fittings and its Verification Using a Laboratory Model.

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.

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.

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.