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Figure 2.Mesh when the piston at TDC Import the star .cel and star.vrt files from ICEM-CFD into STAR-CD software to generate dynamic grid.
The engine speed for simulation is always 1200r/min.
Then we compare the simulation result with the text data foreign experiments got.
Figure 4.Comparison between simulation result and text data Calculation Result and Analysis Simulation conditions.
Figure 10.Variation of the emissions for various gas injection timings Conclusions In this paper, we use CFD simulation technique to create the computational model for the diesel engine fueled with pilot-ignited directly- injected natural gas.

Temperature Analysis in Durability Test of the Viscous Damper Wang weining 1, a, Yan Weiming 1,b , Chen Yanjiang 1,c 1 School of Architecture and Civil Engineering, Beijing University of Technology, 100124, Beijing, China awangvn@hotmail.com, byanwm@bjut.edu.cn, acyjrlx@sina.com Keywords: Viscous Damper; Oil film; CFD Thermal; Temperature; Abstract.
In order to avoid the overheating generated by long working hours, which resulting in a viscous liquid water evaporation and leading to a abrupt increase in internal pressure inside the cylinder, the CFD software Fluent was used to simulate the durability test process of the oil film, where the heat was easy to generate and suggestion for improving the viscous damper was proposed.
Numerical Simulation Analyses As above mentioned, heat generated in cylinder and consumed mainly through viscous dissipation and internal friction.
On the basis of above analysis, CFD software Fluent was used to simulate the heat generation process and location in damper and determinate the key factors leading to elevation of the cylinder temperature.
Fig.3 Location Diagram of the Simulations In modeling, considering that the working velocity in the durability test should not be over 1m/s, and taking into account of width of the orifice and the viscosity of the fluid, the Reynolds number should be <2000[5], therefore Laminar flow model was adopted.

CFD modelling is used to study hydrodynamic and thermal conditions near surfaces with different patterns.
Modeling CFD Model.
CFD simulations of the pattern C showed that fouling seems to be reduced at the convex areas of the studied surface pattern due to increased shear forces and lowered surface temperature.
In addition, numerical simulation of particulate resuspension showed that removal from the pattern C is more efficient.
Therefore, the reduced fouling rate seen in the experimental results of the pattern C may be explained by the simulation results.

Kim researched the performance and structural safety of 50 kW ocean current turbine rotor by CFD simulation and unidirectional FSI analysis[3].
Steady numerical simulation can be performed using CFX to get the loads in the fluid field.
CFD analysis of the HATCE turbine The configurations of the selected HATCE turbine are shown in Table 1.
According to Ref.[5], the numerical simulation was performed with the MRF model using the ANSYS CFX.
Numerical simulation of fluid-structure interaction basing on the ANSYS[D].

Gulawani et al [9] who studied direct contact steam condensation as application to steam jet injectors, and direct contact feed water heaters using CFD.
Supersonic Nozzle Schematic Diagram [4] Problem Description In this study the simulations are performed on a computational domain of cylindrical vessel whose diameter is 0.05m and the nozzle used here is shown in figure 1.
This nozzle is fully capable to provide the supersonic injection as can be seen from the preliminary CFD result in figure 2.
Conclusions In this paper a CFD analysis of the supersonic steam jet injected inclined to the cylindrical vessel is done.
Jyeshtharaj, B.J., Manish, S.S., Chaganti, S.R., Daya, S.S., CFD analysis of flow pattern and heat transfer in direct contact steam condensation, Chem.

Simulation Methodology In this paper, the relatively simple and low computational cost two dimensional, CFD-based FSW model, originally developed by Seidel [2] and further modified by Long and Reynolds [3] has been used to perform parametric studies.
The commercial computational fluid dynamics (CFD) code, FLUENT[4], was used to develop the FSW process model.
A critical aspect of using CFD to simulate deformation of a solid is to develop a reasonable viscosity formulation.
It is interesting to note that other CFD simulations that do not incorporate a rapid flow stress drop at some critical temperature do not capture this behavior.[7] Summary and Concluding Remarks The simulation results presented here indicate that a simple, 2-D, fluid mechanics based model can provide useful insight regarding several trends in FSW process parameters and base Figure 3.
"Parametric Studies of Friction Stir Welding via CFD Simulation", T.

The fractional results were validated through computational fluid dynamics (CFD) simulations.
As shown in Fig. 6 (a), the velocities obtained from the CFD simulation are three times lower compared to the experimental velocities depicted in Fig. 6 (b).
However, the use of 2D model in the simulation could not accurately predict the velocity profiles.
Fig. 5 Flow behaviors in a partially filled test section (CFD simulation) Fig. 6 Flow behaviors in a partially filled test section (CFD simulation) Conclusion The proposed fractional estimation method as an alternative to the Forchheimer equation to determine permeability is suitable for 3D printed foam with a height of 60 mm or larger, and pore sizes up to six times larger than 5 PPI foam.
Bracconi et al., “Investigation of pressure drop in 3D replicated open-cell foams: Coupling CFD with experimental data on additively manufactured foams,” Chem.

In this paper, CFD analysis of the temperature fields of the multi-array hole-entry hybrid journal bearing with various bearing construction parameters and operation parameters are presented.
In this paper, the temperature field is simulated by the CFD commercial code FLUENT which can simultaneously resolve the Navier-Stokes equation, continuity equation, energy equation and temperature-viscosity equation with the finite volume method (FVM).
Numerical Model and Simulation Procedure Control Equations.
Simulation Procedure.
Fig. 2 shows the 3-D simulation model of a three-array hole-entry hybrid journal bearing developed using the CFD package FLUENT 6.2, and Fig. 3 shows the corresponding grid model generated by the pre-processor Gambit2.3.

Based on the classical theory of incompressible flow, CFD software FLUENT is used to simulate and analyze the flow characteristics of water hydraulic slide valve.
In order to design an applicable water hydraulic servo valve, it's necessary to study the flow characteristics of the slide valve with CFD software FLUENT.
The accuracy of CFD simulations has been confirmed in many occasions [3, 4], and the uses of simulations can avoid the constructions and testings of prototypes, as a result, the R&D cost and time are reduced.
Boundary Conditions of Simulation.
The flow coefficients get from simulations with different boundary conditions are almost equal, so the simulation is correct.

The geometry was built in ICEM-CFD® software which belongs to ANSYS 15.0 package.
Abdelrahman, Numerical investigations of convective heat transfer for lattice settings in brick tunnel Kiln: CFD simulation with experimental validation.
Lima, On the Use of CFD in Thermal Analysis of Industrial Hollow Ceramic Brick.
Lima, Industrial ceramic brick drying in oven by CFD.
Araújo, Numerical simulation via CFD of the drying of industrial ceramic bricks, Thesis (Doctoral in Process Engineering), Postgraduate Program in Process Engineering, Center of Science and Technology, Federal University of Campina Grande, (2019) 212f.