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A CFD package STAR-CD is used for the analysis to study the in-cylinder flame distribution, heat release rates, in-cylinder pressures and temperatures, CO and NO emissions were studied in CI engine in conventional and in HCCI Mode.
CFD Model Set- Up: The piston bowl shape and 3D mesh of the piston bowl sector is shown in the Fig.1.The computational mesh consists of 0.312x106 cells.
CFD Model Validation: STAR-CD is a well known Commercial CFD package and is well validated.
Multi-Dimensional Simulation of n-Heptane Combustion under HCCI Engine Condition Using Detailed Chemical Kinetics, The Journal of Engine Research/Vol. 22 / Spring 2011.

Rahbar and Esfahani [7] applied 2-D CFD (Computational Fluid Dynamics) simulation in estimating the hourly yield of a single-slope solar still and found that the CFD analysis is used to identify the Nusselt number.
A time step of 60 seconds is used in the simulation.

Timely detecting the buried pipeline leaks and accurately determining the leak and the law of heat and mass transfer processes in multiphase leak has an important significance on numerical simulation analysis.
In this paper, theoretical knowledge of heat transfer, computational fluid dynamics, fluid mechanics , etc. was used to select the appropriate method for calculating the numerical simulation of multiphase flow for buried pipelines for oil-water-gas in the low temperature multiphase flow ( volume ratio 10:1:89 ) leakage process by using computer simulation, to analyze the impact of high viscosity and low viscosity properties on the physical properties of the oil phase of the multi-phase leakage process and to simulate the process of the leak by the use of CFD software.
Numerical simulation of the regional dimensions is 20m × 10m.
Multiphase flow leakage process conditions of high viscosity of the oil phase viscosity resulted that the oil phase can not be gathered in the top of the water phase in a short time, and hindered the trend of crude oil leaking to the surface. 2） Buoyancy produced by density difference can be overcame in a short time in the process of multiphase flow leakage of high viscosity of the oil phase, so that the oil phase gathered at the bottom of the mouth, resulting that the leakage of crude oil penetration area above the buried pipeline was water phase, which was different from the low viscosity conditions multiphase flow leakage during penetration of oil spill area. 3） The impact of oil viscosity conditions on heat and mass transfer processes can’t be ignored when numerical simulation of the leakage of multiphase flow of buried pipelines in cold regions was conducted.
Buried pipeline leak Numerical simulation of temperature field,[D] Daqing Petroleum Institute Journal

By using AVL FIRE code, three-dimensional numerical simulations of the diesel-natural gas injection characteristics in a direct injection diesel-natural gas engine were conducted.
According to the geometric symmetry of the combustion chamber and location of the injectors, the CFD calculations were performed with the mesh of 51.43°.
Based on the above simulation models, the simulated cylinder pressure and heat release rate for the dual-fuel engine were in good agreement with those from the experiment, which verified the validity of the simulation models[3].
So here the natural gas injection velocities of 50m/s, 100m/s, 150m/s, 200m/s, and 250m/s were chosen for numerical simulation study.
Numerical Simulation of the Effect of Fuel Injection on Combustion and Emission of Diesel Engine.

Introduction During the design of hydraulic machinery, processing and numerical Simulation Study, generally need to create an accurate physical model.
With the CFD technology is widely used in the field of hydraulic machinery, the modeling capabilities of researchers is also increased correspondingly.
The establishment of an accurate physical model is an important first step if researchers want to obtain accurate simulation results.
Accurate three-dimensional digital model is required in the numerical simulation study on the runner, if the modeling method is incorrect, that may lead to abnormal irregularities and bring the error to the simulation results.
When conduct the numerical simulation, due to the narrow blade and a larger degree of spatial distortion, coupled with the combination of long blades and short blades, there is a certain degree of difficulty to establish the model, improper methods are likely to have an adverse impact on the results of simulations.

We discuss the experimental implementation of the extra gas pipe and present numerical simulations of temperature field and mass transport in the new growth configuration.
temperature field and mass transport, was carried out using the commercial CFD-ACE+ software package (CFD Research Corp.) [8]. 2D numerical simulations were performed in order to explain the mixing of the additional gas stream with the SiC physical vapor mass transport.
SiC crystal photographs and numerical simulation of the corresponding SiC gas species concentration in the M-PVT configuration for three different additional gas fluxes.
This experimental result was also predicted by the computer simulation.
The rather precise prediction of the numerical simulation of the experiments enabled us to better understand the M-PVT process from a fluid mechanical point of view.

Numerical Simulation of Aerodynamic Performance of Film Cooling on a Flat Plate with Surface Roughness Jianfei Wang*a, Yongbin Jib, Shusheng Zangc Shanghai Jiaotong University, Institute of Turbomachinery, China awjf040@sjtu.edu.cn, b799503144@sjtu.edu.cn, csszang@sjtu.edu.cn Keywords: Surface roughness, Film cooling, Numerical simulation, Aerodynamic performance, Skin friction coefficient Abstract.
Numerical simulation on a rough flat plate with a row of 35°round film holes under different roughness heights, Reynolds numbers and blowing ratios is conducted to see how they affect film cooling on a flat plate.
Fluent is a widely used CFD software to handle different kinds of flow and heat transfer problems, and this study is based on the Fluent.
Skewness of the mesh is checked to be found satisfied to the engineering simulation demands. the first depth of the grid must be bigger than roughness parameter ks , so the first depth is 1mm.
After simulation ,results are analyzed in terms of aerodynamics to reveal the effect of the roughness height, mainstream Reynolds number and blow ratio on the film cooling.

Based on momentum theorem, principle of mass conservation, and some experimental formulas, the distribution of velocity in ladle furnace was calculated by CFD methods.
Results and Discussion Simulation Analysis of Molten Steel Flow with a Blowing Argon Hole in LF.
Simulation Analysis of Molten Steel Flow with Two Blowing Argon Hole in LF.
References [1] QU Tian-peng,JIANG Mao-fa.Numerical Simulation on Gas-Liquid Two Phase Flow in Argon-Blowing Ladle[J].
Application and Development of Mathematical Simulation Method for Researching Flow Field in Ladle[J].

Fig.1 Axial flow impeller blade wear In order to analyse the erosion problems of the axial pump impeller, the movement of solid particles inside the impeller was investigated by CFD numerical simulation, and the accuracy of numerical results is verified by the wear experiment.
The NS1250 submersible axial flow pump made in Nanjing Lanshen Pump Group is used for the simulation.
The curves of efficiency and head obtained by numerical simulation and experiment are shown in Fig.4.
Numerical Simulation of Erosion and Partical Motion Trajectory in Centrifugal Pump[J].
Simulation of solid-liquid two-phase turbulent flow in double-channel pump based on mixture model[J].

High conductivity porosity materials are proposed to enhance the phase change materials (PCM) in order to solve the problem of low conductivity of PCM in the latent heat storage device (LHSD), and two-dimensional numerical simulation is conducted to predict the performance of the PCM by CFD software.
In the present paper, a numerical model for a latent heat storage device (LHSD) is presented, where aluminum or graphite foam is used for heat transfer enhancement of paraffin, then data from literature are used to validate the simulation method by Fluent software, a widely used commercial software.
Fig. 3 Comparison of the simulation with literature results Fig. 4 Variation of liquid fraction with time under different grid Results and discussion (c) e= .95 (b) e = 0.84 (a) Pure paraffin Fig. 5 Effect of porosity on the temperature of PCM Analysis of temperature for the PCM in solidification process.
The analysis presented here can broaden the method of thermal conductivity for PCM, and the simulations may be used in the design of latent heat storage systems.