Search results

The simulation results show that the swirl intensity in cylinder can be tuned by this device.
Fig. 2 Computational grid CFD calculations of variable swirl Geometry and Grid Generation.
This simulation model in the present study includes intake manifolds, intake ports, intake valves and cylinder.
The grid generation is done by importing the geometry into AVL-FIRE commercial CFD code.
The results indicate that the CFD model can be used as a tool to understand the effect of various parts of air intake system for optimization.

Computations of Transient Flows and Sprays of Port Fuel Injector Yin congbo1, a, Zhang Zhendong1,b, Guo Hui2,c and Cheng Qiang1 1College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China 2College of Automobile Engineering, Shanghai University of Engineering Science, Shanghai 201620, China aemailyincong@tom.com, bzzhend@hotmail.com, c ghguohui@yahoo.com Keywords: Transient Flow; Port Fuel Injector; Spray; CFD simulation Abstract.
A CFD method was adopted to study the transient flow and spray characteristics of multiple nozzle holes port fuel injector.
The simulation is performed using the standard k-epsilon model.
Compared with the experiment results, the fuel flow rate is higher for simulation.
Spray Simulation Results Spray simulation was performed in a computational domain of 50 x 50 x 100 mm3.The size of cells is 1 mm.

In this work CFD simulation has revealed the difference of injection angles ranging from 35°,45°,55°,65° and 90° with different blowing, where the low blowing ratios are represented by M = 0.5, and the high blowing ratios by M = 1.0 and 1.5.
Alameldin, et al. [15], performed a CFD Analysis to study the increase in total losses of a transonic turbine blade subjected to film cooling.
Simulation has revealed the difference of injection angles ranging from 35°,45°,55°,65° and 90° with different blowing, where the low blowing ratios are represented by M = 0.5, and the high blowing ratios by M = 1.0 and 1.5.
Concerning CFX, a fully second-order accurate finite volume solver was used for all simulations.
In the present paper, a CFD-based parametric study on the performance of film cooling is carried out by modifying the injection angles of holes.

Based on this optimized geometry, the aim of the present paper was to verify the influence of the underflow diameter on the overall separation process at 147 kPa on the same optimized hydrocyclone geometry, but without the filtration effect, by performing laboratory experiments and CFD simulations using the commercial software Fluent®.
For that reason, CFD was applied in this study.
In order to understand better the internal flow of the equipment, the volumetric feed flow rate results shown in Table 1 were used as input for the fluid dynamic simulations.
Fig. 2 and 3 show the final results of these simulations.
vz(m/s) DU (mm) 3 4 5 Fig. 2 – CFD results of descendent axial velocity (vz).

The model used for the CFD analyses The heat accumulator considered in this paper consists of a metal box with thermal insulation.
Fig. 1 The CAD model of the heat accumulator used in the CFD analyses Fig. 2 The mesh used for the CFD analyses The CFD analyses used three mathematical models to obtain the melting of the wax, the heat transfer inside the wax, through the copper wall of the water pipe and inside the flowing water and the turbulence inside the fluids.
The obtained results for the model of the heat accumulator The results of the CFD analyses are showed in a plane which passes through the middle of the water pipe.
At the end of the simulation the maximum temperature of the wax had a value of 90ºC.
At the end of the CFD analyses the temperature value of the water exiting the heat accumulator is 55ºC.

With the rapidly development of CFD technology and computer technic, results of CFD calculations can provide us with plenty of reference[3-5].So it’s a kind of labour and time saving to use CFD method in the hydraulic model research of nuclear main pump, by which we can screen the designed model accordingly.
The whole domain flow channel was assembled in PRO/E and imported to ICEM-CFD for grid partition.
The numerical simulation adopted three-dimensional steady incompressible time average Reynolds equations, which was closed with standard k-ε turbulent model.The specific mathematical model refer to references.
Nuclear Engineering and Design, Vol. 167 (1996), p.91 [3] Zhijiang Wu,WanYong Zhao: Numerical simulation of interior flow field of mixing flow pump[J].Fluid Machinery, Vol. 33-10 (2005), p. 15.
:Numerical simulation of the effect of structure parameters on the mixing circulating water pump performance[J].

Large Eddy Simulation of Unsteady Flow in a Mixed flow Pump Guide Vane Yibin Li1, Rennian Li1,a and Xiuyong Wang1 1School of Energy and Power Engineering, Lanzhou University of Technology No.287 Langongping Road, Lanzhou, 730050, China, alirn@lut.cn Keywords: Mixed-flow pump, guide vane, pressure fluctuation, vortex, LES, CFD Abstract.
Due to the high price, time costing and lag of the experimental method, and with the development of fluid dynamics, CFD (Computational Fluid Dynamics) numerical calculation technology has been widely used in the field of three dimensional turbulence numerical simulation with advantage of short period and leading character.
Miorini, et.al.[3] discover the blade tip leakage vortex structure and unsteady flow mechanism of mixed-flow pump by PIV (Particle Image Velocimetry) and CFD (Computational Fluid Dynamics).
Doing unsteady flow numerical simulation of inner flow field in the mixed flow pump can forecast the characteristics of pressure fluctuation through analyzing the complexity of mixed flow pump inner flow field by using numerical simulation, which has great significance for the project.
Comparing to the prediction of Reynolds-averaged Navier-Stokes (RANS)equations, the CFD unsteady performance prediction cannot forecast the H-Q positive slope precisely basing on the equations.

ANSYS Fluent is used to conduct steady-state simulations.
Results and Discussion CFD Validation.
The present CFD model is validated by comparing its results with experimental data.
Numerical simulations are conducted based on obtained conditions to validate optimization.
The difference between the numerical simulation results and the RSM response was less than 1%.

This data base is generally available from wind tunnel testing or from CFD aerodynamic simulations and contains aerodynamic coefficients for different flight conditions and configurations (such as Mach number, angle-of-attack, vehicle configuration angle) encountered over different space vehicles mission.
Another type of data is numerical data resulting from CFD simulations, with a lower level of confidence, which depends also on the used numerical method (Euler / RANS, flow regime, etc.)
The data sets considered in this work contains output values obtained from two different sources (experimental measurements and CFD simulations).
However one of them (experimental measurements) is supposed to be more accurate than another (CFD simulations).
However, if region contains lots of HF experimental points then in this region CFD points should be treated as LF, whereas in region without experimental points CFD points become HF data (see Fig. 3).

Numerical Simulation of Catalytic Combustion Based on Different Catalyst Structures Peiwen Wang1,2,a ,Yang Du1,b, Weidong Shen2,c , Jianjun Liang1,d, Jiafeng Xu1,2,e 1Department of Military Oil Supply engineering, Logistical Engineering University, Chongqing, China 2Key Laboratory of Special Power Supply of PLA, Chongqing Communication Institute, China a13594199055@139.com,bduyang58@163.com, c13908341643@139.com,dcomet613@163.com,e13062308087@139.com Keywords: catalytic combustion, catalyst structure, CFD, simulation Abstract.
The catalytic combustion of methane over a single pellet catalyst of different structures was modeled by two-dimensional numerical simulations.
The gaverning equations (continuity, momentums, energy,species mass conservation equation) are solved using the commercial CFD code FLUENT.
Parts of simulation results was shown in Fig.4 .
Results of the simulation investigations of combustion in a single pellet catalyst are presented.