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Therefore, it is considerable significance to get the accurate simulation results of the temperature field.
A lot of research has been made about the temperature simulation of the laser welding [2-7].
The secondary development of OpenFOAM OpenFOAM (Open Field Operation and Manipulation) is a free, open source CFD software package.
The solver for simulation is the secondary development of OpenFOAM.
And the Fig.6 is the simulation results after 350 time steps.

Compare the displacements between simulation and experiment at each load, the maximum error is smaller than 5%.
For the research of the diaphragm capsule packaged in vacuum pressure sensor, the integrated use of CFD, finite element software , finite element analysis software for the analysis and calculation may make forecast with high efficiency and precision.
Fig.7 The Light episodic characteristic test device Comparison of Simulation and Experiment The simulation and experimental results of the lower diaphragm center displacement are shown in table 2.
The simulation and experimental results of the diaphragm capsule’s elastic characteristic is shown in figure 8.
The results of simulation and experiment show that this simulation algorithm is feasible and highly precise.

Numerical Simulation Of Burner For Micro Gas Turbine Jia Lei,Liu Shi,Huang Yaosong,Wang Neng,Wang Fuzhen,Li Zhihong Energy Power and Mechanical Engineering Institute, North China Electric Power University, Beijing, China, 102206 Jialei1025@126.com Keywords:Micro gas turbine; Oxy-fuel combustion; Burner; Numerical simulation; Fluent Abstract.
Numerical simulation was used to study flow field and combustion conditions.
Computational fluid dynamics simulation is a important method of testing performance of burners [3].Condition of flow field and temperature filed can be forecasted through simulation, thereby providing guidance for optimization of burners.
Duty methane 2.duty air 3.main methane 4.primary main air 5.Secondary main air 6.axial swirl burner A 7.axial swirl burner B 8.outer wall of combustion chamber Table 1 Tilt angle of axial swirl burners Burner swirler A swirler B Ⅰ 30° 30° Ⅱ 40° 40° Ⅲ 50° 50° Table 2 Parameters of axial swirlers Prameter swirler A swirler B Internal diameter (mm) 5 20 External diameter(mm) 12 34 Blade number 6 12 Blade thickness (mm) 0.5 0.5 Numerical Simulation Numerical Simulation was carried out by computational fluid dynamics software Fluent.
[6] Dudebout R，Reynolds B，Molla-Hosseini K．Integrated Process for CFD modeling and optimization of gas turbine combustors [C]．Proceedings of ASME Turbo Expo 2004：Power for Land，Sea and Air，Vienna，Austria，2004

With the method of Computational Fluid Dynamics(CFD), aerodynamic characteristics and longitudinal static stability of the conventional airship and new winged airship were comparative investigated.
Geometry Modeling 3D model of conventional airship and new winged airship used in the numerical simulations are of the same size and their only difference is that the winged airship adds a wing at the backward of the hull.
During the simulation three dimensional Reynolds Averaged NS equations (RANS) were used and coupled pressure-velocity solution was selected.
In order to ensure the simulation accuracy, realizable k- turbulence model was selected for the calculation.
Journal of Computer Simulation.

Simulation Methodology Geometry.
It has been simplified by removing all small and medium sized parts and filling up the cavities because the real model is too complex for the current CFD study.
Simulation Setup.
St Fig. 5 Noise spectra comparison between simulation and experiment at R2 Simulation Results.
The simulation data is coincident with the experiment data.

In Computational Fluid Dynamics (CFD) we have to deal with various types of phenomena with strong discontinuities at different length scales like turbulence or hypersonic flows.
The included methods represent a significant selection of the most commonly used numerical schemes in CFD.
High-order finite-difference schemes for numerical simulations of hypersonic boundary-layer transition.

Numerical Simulation Research on Aerodynamic Characteristics of the Fixed Transition Airfoil Jixiang Shan1,a, Yong Huang1,a, Xiaoyong Ma1,b, Yonghong Li1,c and Jie Bai2,d 1 High Speed Institute, China Aerodynamics Research and Development Center, Mianyang 622661, PRC 2 China Academy of Launch Vehicle Technology, Beijing, 100070, PRC asjx637@163.com, bmxycardc@mail.ustc.edu.cn, clyhxj52@stu.xjtu.edu.cn, dvean_bj@yahoo.com.cn Keywords: numerical simulation, the fixed transition, aerodynamic characteristics, Reynolds number Abstract.
In the paper, the simulation is based on a finite volume formulation of the Navier–Stokes equations.
（a）=0.1 （b）=0.2 （c）=0.5 （d）=0.9 Fig. 5 Effect of the transition position on velocity profile (a=0º, Ma=0.6) Summary The numerical simulation is carried out to investigate the ability of the fixed transition to simulate Re number effect by comparing the aerodynamic characteristics of the test model, flight model and transition model.
Transition modeling for general CFD applications in aeronautics, AIAA 2005-0522,2005

Fig. 1 Human mouth-throat model 1.2 Governing equations 1.2. 1 Governing equations of the gas phase The large eddy simulation used in the paper is a transition between direct numerical simulations and theoretical model simulations.
The results show that the numerical simulation data are in reasonable agreement with experimental measurements, which verifies that the large eddy simulation methods are accurate and reasonable.
The following conclusion can be drawn: 1) Large eddy simulation data are in reasonable agreement with Particle Image Velocimetry (PIV)experimental measurements, which verifies that the simulation methods are accurate and reasonable.
CFD simulation of aerosol deposition in an anatomically based human large-medium airway model.
Large eddy simulation of inhaled particle deposition within the human upper respiratory tract.

NUMERICAL SIMULATION OF LEAKAGE OF OIL IN A SUBMERGED DUCT AND THE BEHAVIOR OF OIL IN A MARINE ENVIRONMENT MOREIRA, Gicelia 1,a, ARAÚJO, Morgana Vasconcellos1,b, BURITI, Cidronia J. de Oliveira 2,c, FARIAS NETO, Severino Rodrigues1,d, LIMA, Antonio Gilson Barbosa 3,e 1Federal University of Campina Grande, Center of Science and Technology, Zip Code 58429-900, Campina Grande, Paraiba, Brazil. 1 Chemical Engineering Department, 2 Process Engineering Post Graduate, 3 Mechanical Engineering Department, agicelia.moreira2009@gmail.com, bmorganamva@gmail.com, cjaneburiti@yahoo.com.br, ds.fariasn@gmail.com, eagblima@pq.cnpq.br Keywords: Computational Fluid Dynamics, submerged pipeline, leakage, CFX.
Therefore, this paper aims to study through numerical simulation the leakage behavior in a pipeline carrying oil in the marine environment using the computational package Ansys CFX®.
The numerical mesh was generated in ICEM CFD 15.0 and has 40510 hexahedral elements.
Table 1: Boundary conditions adopted for simulation Input section in March Output section March Inlet section tube Output section tube Front and back plans Temperature of the fluids (Constant) Speed Uw=0 Static pressure of 1 atm Speed Uo=1.02 e 2.04 (m/s) Static Pressure of 1atm Symetric conduction 298.15 K (25⁰C) Uw = maximum speed of the water, Vo = maximum speed of the oil.
A convergence criterion was adopted of 10-7 kg/s and a time step of 0.01s for a simulation time of 4s.

The research method in this paper is numerical simulation; numerical simulation involves Direct Numerical Simulation[1,2,3], large eddy simulation[4] and RANS.
Although both the wind tunnel test and the CFD simulation are necessary methods when solving vehicle aerodynamic characteristics problems, which are not isolated and should be mutual supplemented and cooperated.
Numerical simulation has irreplaceable merits and has got a position in vehicle aerodynamic characteristics research; such as, numerical simulation design period is short; numerical simulation can save enormous labor, financial and material resources.
The model is simplified in simulation, omitting the door handles, windshield wipers and rearview mirror, omitting the wheels and filling the wheel pits.
Rodi, "Direct numerical simulation, large eddy simulation and unsteady Reynolds-averaged Navier-Stokes simulations of periodic unsteady flow in a low-pressure turbine cascade: A comparison", Journal of Power and Energy, vol217, 2003, p. 403-412 [3] V.