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As computational fluid dynamics (CFD) of the progress and performance of computer hardware improving, the accuracy of three-dimensional numerical simulation of turbulent flow increases.
Numerical simulation technology has become a powerful tool for development, design and optimization of hydropower stations [1-4].
Water level and flow parameters Parameter In Power In Pump Flow rate(double) 109.06m³ 80.4m³ Size of outlet section of diversion tunnel 28.2m2 28.2m2 Numerical simulation method This calculation uses a one-way flow simulation and k-ε model.
Simulation example results meet the requirements.
A CFD approach to the computation of the acoustic response of exhaust mufflers.

Simulation Study for Mixing Characteristics of NH3 and Automobile Exhaust in the SSCR System Dawei Qu1,a Kai Zhang2, b Luyan Fan3,c,Haibo Gao4,d 1,2,3State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China 4,Passenger Car Department Passenger Car Design Section II,FAW Co.
Figure.1 Urea solution injection model’s grid Table 1 Parameters of jet model correction spray height 120mm spray pressure 0.55MPa Spray angle 65° Injection duration 32ms Nozzle hole number 1 Urea injection amount 0.1g Nozzle hole diameter 0.4mm The wall temperature 650K The analysis of simulation results Figure 2 shows CFD simulation results which the urea solution spray from 10ms to 110ms , the image for each interval of 10ms .As can be seen from the graph, the spray shape is a conical hollow in the middle, the cone angle is about 50 degrees to 60 degrees, with the passage of time, the end of the spray, mist droplets collides wall , and after collision the rebound area increases gradually.Fig.3 are the experimental results of the spray, the experimental results are quoted from the [3], it uses spectrometer photographic, no specific scale, mainly for image research.
Figure.3 The experimental results of pipeline urea spray model Figure.2 The CFD simulation results of urea water spray Simulation and analysis of affect factors for the jet of SSCR system Using FIRE establishes the model that NH3 directly injects in the exhaust pipe in front of SCR box .Fig.4 is simulation model for the exhaust pipe, length 1.36M, diameter 0.12M,grid number 100000.The nozzle position is in x=0, y=0.05, z=-0.28.
NH3distribution of the literature [2] and the simulation graphics are compared,studying the difference between the two, and analysing the advantages of direct injection of NH3.
Simulation study of NH3 and the gas mixing characteristics for SCR system[J].Journal of internal combustion engine.2013(204) 43-47

Numerical Simulation on Aerodynamics of Ramjet Projectiles Jiaxian Zhanga, Yanna Wang, Ruimin Liu Beijing Institute of Aerospace Testing Technology, Beijing 100074, China acallingxh@gmail.com Keywords: Projectile; Ramjet; Aerodynamics; CFD; TVD Abstract: Three-dimensional Reynolds-averaged Navier-Stokes simulations have been performed to explore the aerodynamic characteristics of ramjet projectiles.
The complex wave structures of ramjet projectiles with different architecture at different inflow Mach number were achieved by numerical simulation.
As a key segment of research on ramjet projectiles, numerical simulation on aerodynamic characteristics are very important.
Computational Approach With decades of development, present CFD approaches can predict the aerodynamic characteristics of vehicles accurately.
Numerical simulation on ramjet inlet with different cowl leading edge, AIAA 2005-5288

Batina developed an explicit meshless method[1] based on least-squares curve fits and introduced the new method into the practical computation for CFD in 1993.
Therefore, will be set to a value, if. 4 Numerical simulation results and analysis AIAA organized drag prediction conferences to evaluate calculation accuracy of aircraft drag prediction in CFD from 2001 to 2009 for four times.
Numerical simulation of the wing-body configuration is performed by a number of specialized research institutions and universities, including NASA, DLR, ETC., with several well-known CFD software.
Gridless method for the simulation of transonic and supersonic flows.
Application of meshless method in numerical simulation of muzzle flow field.

Then the gas pressure drop and velocity distribution in flue pipes using CFD are discussed.
In the present CFD analysis, the standard k-ε model is employed, which has been found to be of a wide applicability[4,5].
In this study, second-order upwind scheme has been applied for simulations.
During the simulation, the ash layer is assumed steady.
Larachi, Analysis of flow in rotating packed beds via CFD simulations-Dry pressure drop and gas flow misdistribution.

In this paper, the authors use FEA coupled CFD to design the layer sequence of composite propeller and develop ANSYS subroutine to simulate resin flow in the mould.
In this paper, the authors use finite-element analysis (FEA) coupled computational fluid dynamics (CFD) method to study the hydro-elastic interaction of composite propellers in the flow.
By the simulation, the optimized laying sequence is designed to produce composite propeller.
Hydrodynamic simulation.
RTM processing simulation Mathematic modeling.

Usually RNG turbulence model was chosen in Fluent simulation.
Equation： (1) Equation： (2) 2 CFD Geometric Modeling and Flow Field Analysis Boundary conditions are classified as inlet boundary and outlet boundary.
The exit velocity from cavitation nozzle is [5]: (4) -actual jet nozzle flow rate，； -nozzle outlet diameter, ； -nozzle jet pressure, MPa； According to the shape of oscillating cavitation nozzle ,hexahedral meshes are used in ICEM CFD simulation.
Table 1 is the simulation results for different cavitation nozzle parameters.
The simulation parameters were kept same except the length of the cylindric section S.

Matrix heat exchanger design The records found from this work are used to maximise the geometry of the tube of matrix heat exchanger by computer simulation.
CFD Model.
The optimized design of the matrix heat exchanger is modelled for heat transfer between hot and cold fluid in flow Simulation which is CFD simulation module of solid works 2009.
Figure 5 MHE Vs CFD Analyse -variation of heat transfer rate with respect to mass flow rate From the Figure 5 come to know that experimental data are matching with CFD analysis by little margin variation.
The both CFD analyse and experimental have the upward tendency for heat transfer rate with respect to mass flow rate.

In this paper, a thermal inkjet printing simulation model is established in the CFD simulation platform, and the influence of inkjet driver parameters and ink physical parameters on the printing process is studied by numerical simulation.
Numerical Simulation Method Simulation Theory.
Simulation Modeling.
Schematic diagram of two-dimensional simulation model Table 1.
Pneumatic droplet ejection process simulation and size uniformity test[J].

In this paper, we study the temperature and pressure distribution within the tunnel oven by the commercial CFD software-fluent. while the temperature of the vials, the heating process of the bottles in the tunnel oven.
CFD simulation of tunnel oven The boundary conditions and parameters setting.
Conclusion Through simulation, verification laminar flow tunnel oven can satisfy the GMP requirements, while comparing multiple simulations under different wind speed, get a optimum speed range of hot air.
But the simulation of the tunnel oven is a very complex process, in this simulation, the model was simplified at some extent, without considering the greater impact of the cooling zone and the preheating zone to the sterilization section in the practical production; And the differences the conveyor belt and insulation material will certainly affect the results; some of the parameters in simulation are set some experience date from the practic production, we should to further improve in order to ensure data accuracy.
Multi-belt dryer CFD simulation and wind field test [J], Drying technology and equipment, 2007,5 (1) :15-21