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Simulation of Scavenging Process in a Two-Stroke Gasoline Engine Changyuan Li1, a, Dong Tang1,b, Nan Li 1,c 1 School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China alichangyuan1192@126.com , bdtang@ujs.edu.cn , clinan1111111@126.com Keywords: Two-stroke engine, Scavenging process, Numerical simulation Abstract.
Three-dimension transient numerical simulation of flow field in the transfer ports , exhaust port, intake port, crankcase and cylinder system of two-stroke gasoline engine was studied by using CFD software Fire, and the situations of airflow movement and exhaust gas distribution were presented dynamically in the scavenging process.
In order to eliminate the influence of crankcase and improve the authenticity and accuracy of simulation, in this paper the simulation region of two-stroke engine is expanded to the transfer ducts, exhaust port, intake port, crankcase and cylinder system, which can better reveal the situation of airflow movement and flow field distribution in the scavenging process.
Numerical simulation solution equations, including momentum conservation equation, mass-conservation equation, energy conservation equation, k-ɛ equation and components transfer equation, are coupled with corresponding gaseous state equation and thermodynamics formula to obtain closed control equations.
Simulation starts from 113° CA ATDC, which is in pure exhaust phase.

The Numerical Simulation of the Water Jet in Hydroentanglement Heng Zhang 1, a, Xiaoming Qian 2, b Zhimin Lu 1, c and Yuan Bai1, d 1 School of textiles Tianjin Polytechnic University Tianjin, China 2 Key Laboratory Advanced Textile Composites Tianjin Polytechnic University, Tianjin, China am-esp@163.com, bqianxiaoming@tjpu.edu.cn, c luzhimin19861220@yahoo.com.cn , d Keywords: Hydroentanglement; Water Jet Needling; Spun Lace; Jet Pressure; Numerical Model; Nonwoven.
This paper simulation the water needle after the water jetting from the water needle plate in the different pressure (100bar, 60bar, 45bar, 35bar).
The dimension of the model was set according to the real spun lace machine; Fig 2 shows the CFD model, boundary conditions.
Mass conservation equation and momentum equation [6] is the basic equation in numerical simulation.
This paper Simulation the water needle after the water jetting from the Water needle plate in the different pressure (100bar, 60bar, 45bar, 35bar), the function of water jet directly influences the effect of way of fiber tangle, the numerical simulation to study water jet is good to the study of fiber tangles mechanism.

Introduction The present researches of refrigerated truck air distribution mainly use the method of CFD, lacking experiment researches.
Study on numerical simulation of temperature and humidity fields in a refrigerated vehicle [J].
Flow field numerical simulation and analysis of refrigerated Transport vehicle [J].
Optimization design and numerical simulation on the field of fluid and temperature in the multi-temperature refrigerated trucks [J].
Application of Computational Fluid Dynamics (CFD) in Refrigeration [J].

These profiles are adopted as inlet profiles in Computational Fluid Dynamics (CFD) calculation[5].
The characteristics of velocity distribution of simulation from CFD match well with that of wind-drifted snow distribution got from the outdoor test in Haerbin.
Results of model simulations.
-A., NUMERICAL MODELLING AND SIMULATION OF SNOW DRIFT.

Two dimensional CFD analysis of micro patterned surfaces in hydrodynamic lubrication.
CFD model for turbocharger journal bearing performances.
CFD simulation of magnetorheological fluid journal bearings.
Simulation Modelling Practice and Theory 19 (2011) 1035–1060
Output maximization of a CIM system: Simulation and statistical approach.

Model simulation using ANSYS Fluent The simulation has to be set at the design condition of the runner.
The following setup has been done before running the simulation using the ANSYS Fluent: · The viscous is set to k-epsilon standard [7]
· The simulation shows that the efficiency of the runner is quite satisfactory.
Strawn, “Tetrahedral and Hexahedral Mesh Adaptation for CFD Problem”, Applied Numerical Mathematics Journal, Vol. 26, issues 1-2
Keating, “Accelerating CFD Solutions”, ANSYS Inc, 2011.

Numerical simulations play an important role in investing the spread of fire and smoke[1-4].
Generally, there are two types of simulation method which are called as the zone models and the field, or Computational Fluid Dynamics(CFD) models.
Thus, the field model is considered to be a more accurate method dealing with fire simulation.
Fig. 1 The geometric model for simulation Fig. 2 presented numerical results of air temperature of a certain space section, obtained using the RNG K-ε model.
Markatos, Natural cross-ventilation in buildings: building-scale experiments, numerical simulation and thermal comfort evaluation, Energy Build. 40 (9) (2008) 1666–1681

Simulation Optimization and Experiment of R1234-ze on the Heat Pump Water Heater Storage Tank Yan Qua*, Fang Wangb, Yu Wangc, Peng Wangd, Tang Lie and Zhao-feng Mengf University of Shanghai for Science and Technology, Shanghai 200093, China aquyan0911020105@163.com, bwang1996930@163.com, c34590320@qq.com, d 704058420@qq.com, e578488783@qq.com, f710498757@qq.com *Corresponding author Keywords: R1234ze, Heat pump water heater storage tanks, Simulation, Temperature test.
The two different condensing coil water structure of simplified schematic diagram Calculated by CFD and Analysis of the Result Influence of condensing coil position in the vertical direction of the tank temperature and velocity field , is to make sure the condensing coil total heat transfer area , and to keep other structural parameters remain unchanged , changing the condensing coil and tank the relative position of the condensation coils were placed on top , middle and bottom three locations.
Respectively, of equal diameter and variable diameter condenser coils at the top, middle and bottom three position, the tank temperature field and velocity field in fluent simulation.
Conclusion With fluent software simulations in this paper, the condensing coils at different locations within the water heater hot water storage tank static heating process calculation of temperature field and flow field in analogue, unequal diameter are discussed further in condensing coil structure, by comparing simulation results revealed that the structure can achieve the uniform heating of the inside of the water, and can significantly improve the temperature.
Comparison between models for the simulation of hot water storage tanks [J].

For fluid simulation, rather than solving the Navier–Stokes Equation using the conventional CFD (computational fluid dynamics) techniques, LBM (lattice Boltzmann method) involves local computations only, and it is proved to be more efficient in small-scale modelling [1].
LBM with Large Eddy Simulation.
In recent decades, LBM has been regarded as an effective alternative to conventional macroscopic fluid simulation methods for many fluid flow problems.
Simulation Results and Discussions A two-dimensional numerical model was set up using DEM-LBM.
Seville, Parallelization of a Lagrangian-Eulerian DEM/CFD code for application to fluidized beds, Powder Technology 2011, 207 (1-3) 270-278

The authors presented their work on a two-dimensional visco-plastic model, using User Define Functions (UDF) in a commercial CFD code (FLUENT).
This paper is an attempt to present a numerical model of material flow and temperature distribution using a commercial CFD code (FLUENT) applied to welding 6061 aluminium alloy, in a 2D domain (positioned at half of the thickness of the parts to be welded), based on Seidel-Reynolds model [5].
· Particle tracing simulation reveals that there is a small quantity of material, placed in contact with the welding tool pin, which adheres to it and participate to complete rotations around the tool rotation axis.
Long, A.P. by commercial fluid dynamics simulation.