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Ins., Wuhan, China, 430064 aza2002@163.com, bemcry@163.com, ckzwhust@gmail.com, dlixianling1983@126.com Keywords: riblet surface, internal flow, drag reduction, CFD.
Computational fluid dynamics (CFD) numerical simulation is adopted to analyze the drag reduction ability of triangular riblet on tube internal flow.
Based on the simulation analysis, the drag reduction mechanism of riblet surface is studied.
A direct numerical simulation of laminar and turbulent flow over riblet- mounted surfaces [J].
Direct numerical simulation of turbulent flow over riblets [J].

Especially since the high speed computer appeared, study of numerical simulation appears more realistic.
This article mainly discuss the application of CFD software FLUENT in goaf gas seepage field.
CFD software can be regarded as numerical simulation for the flow under the control of a basic equation (mass conservation equation, momentum conservation equation, energy conservation equation, components mass conservation equation).
The simulation for basic situation model.
While CFD simulation can help to formulate rational test plan, which could reduce the manpower investment in the test, and revision useful information for designing scheme and the formulation of new methods.

Modeling and verification Simulation process.Research based on GT-power and Fluent co-simulation to analyze uniformity of EGR gas distribution.
The simulation flow as following in figure 2.
(3) Co-simulation of 1-D simulation software GT-power and 3-D CFD software Fluent could obtain engine perfoemance parameters and intake flow related parameters precisely,it provided a reference for engine emission control teconology research.
[2] Ramanathan, Subramanian ; Hudson, Anthony; Styron, Joshua; Baldwin, Brian; Ives, David; Ducu, Dan.EGR and swirl distribution analysis using coupled 1D-3D CFD simulation for a turbocharged heavy duty diesel engine.SAE Technical Papers, 2011
Structural analyses for the vehicle exhaust system based on CFD simulation[J].

With the aid of 3-D CFD simulation, researchers have the means other than optical measurement to thoroughly understand the regularities of fuel-air mixture formation process.
CFD Grid Generation.
The CFD model was created and solved with AVL-FIRE v2008 CFD software package.
Fig. 11 CFD model with new piston head.
With the aid of 3-D CFD simulation, authors found out the possible problems of fuel/air mixing process and reasons of them.

In this paper, the passing ability of the detector in the vertical segment of a pipe was studied using CFD simulations.
In this paper, CFD (Computational Fluid Dynamics) methode is used to calculate the force to the detector by the pipeflow.
Numerical model and simulation results Problem statement.
Simulation results and analysis.
Polidori, Turbulence Model Choice for the Calculation of Drag Forces When Using the CFD Method, Journal of Biomechanics. 43 (2010) 405-11 [7] B.

The combustion process and emission characteristics of DI diesel were calculated using CFD software – FIRE.
In addition to the traditional test methods, numerical simulation the combustion process of internal combustion engine based on experiment is also a powerful measure [2].
Software FIRE is an engine CFD software developed by AVL company, it is believed as the best software in the world in analyzing engine model and solving engine problems which are related to CFD [4].
In numerical simulation of chemomotiveforce reaction process, average chemical reaction rate is the center issue.
CFD Studies of Combustion and In-Cylinder Soot Trends in a DI Diesel Engine – Comparison to Direct Photography Studies, SAE 2000-01-1889, 2000 [3] Borghi R, Delamare L, Gonzales M.

Through CFD numerical simulation, the flow field characteristics, flutter derivatives and critical flutter speed of origin and tuyere models are obtained.
Through CFD numerical simulation, the flow field characteristics, flutter derivatives and critical flutter speed of different models is obtained.
CFD Simulation To investigate a flutter stability control measure for a fabricated steel truss bridge, a typical cross-section is selected.
And its flutter stability is simulated with CFD method and CFD-ACE+ software technology platform.
Pure Vertical Bending Motion Simulation Results Analysis.

The experimental data of pressure drop agree with the theoretical predictions and CFD simulation results within 10%.
Method for CFD Simulations The numerical simulations of two fluid mixtures and of water flow in the Y-typed test sections were performed using commercial software (CFD-ACE+).
Comparisons of total pressure drop among the experimental, theoretical and CFD simulation results as a function of volume flow rate, (a) converging and (b) diverging microchannels
Fig. 2 illustrates comparisons of the total pressure drop for mixture flow with C = 0.75 mol/L among the experimental, theoretical and CFD simulation results as a function of volume flow rate.
These figures clearly show that the agreement among the experimental, theoretical and CFD simulation results is within 10%.

CFD software is used for simulation of the five different models of DSF.
The skins can raise the air temperature during summer due to high temperature outside, therefore it is necessary to thoroughly design and simulate using a model with CFD simulation.
Building Simulation Wind speed contour (m/s) Temperature Contour (Kelvin) Fasad+grill & panel (Open Cavity) Fasade + Grill (Open Cavity) Ventilation Pattern (Open Cavity) Ventilation Clear (Open Cavity) Close Cavity Figure 2: Comparison of CFD simulation results in five models DSF; contours of wind speed and temperature contours, shows that the patterned facade with an open cavity is the smallest, and that the two facades grill & panels, 3.fasad air grill, 4 plain facade ventilation, 5 closed.
Results and Discussion Comparison of 'CFD’ Simulation Results Heat transfer Variations on DSF ventilation cause a different temperature condition inside the building.
CFD simulations on various types of DSF are showed different relationships between air flow in the DSF cavity and air temperature inside the building.

Injector nozzle multiphase flow numerical simulation of high pressure common rail system Yan HU, Guoxiu LI School of Mechanical Electronic and Control Engineering of Beijing Jiaotong University Beijing 100044, China Keywords: Injector nozzle, multiphase flow, CFD, Structural parameters Abstract.
Three-dimensional numerical simulation of multiphase flow of mini-sac nozzles of high pressure common rail were calculated by using the computational fluid dynamics ( CFD ) method in this paper.
The three-dimensional CFD numerical simulation method supplemented by experimental validation can be a good solution to this problem, and this method has been widely applied. [1,2] The object of study is a mini-sac nozzle of high pressure common rail injector.
Conclusion Three-dimensional numerical simulation of multiphase flow of mini-sac nozzles of high pressure common rail were calculated by three-dimensional CFD software in this paper.
A CFD study of the effect of the needle movement on the cavitation pattern of diesel injectors.