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Numerical Simulation of Influence of Different Deflectors on Aerodynamic Characteristics of the Heavy Duty Truck Yukun Liua,Qifei Lib,Guanqun Lic,Ao Liud,and Xingjun Hue State Key Lab of Automobile Simulation and Control, Jilin University, Changchun 130022,China aliuyk1510@mails.jlu.edu.cn,bliqf1510@mails.jlu.edu.cn,cligq6510@mails.jlu.edu.cn dliuao1510@mails.jlu.edu.cn,ehxj@jlu.edu.cn Key words: Automotive Aerodynamics; heavy-duty truck; new deflector; CFD Abstract: In order to reduce the aerodynamic drag of heavy-duty truck, four different shape and style of deflectors based on the original one are added.
The deflector has been widely put into practical production and application [3].CFD software is used in this paper to realize the numerical simulation of flow field of the vehicle, and analyze the characteristics of the aerodynamic drag of a certain model of heavy-duty truck with a trailer.
Numerical Simulation The Computational Domain.
Numerical simulation of drag reduction by non-smooth surfaces in turbulent[J].
[3] HU Xing-jun,LI Teng-fei, and WANG Jing-yu, et al.Numerical simulation of influence of rear-end panels on flow field in wake of a heavy duty truck.Journal of Jilin University,2012,42

The application of Computational Fluid Dynmaics (CFD) techniques can overcome the problem posed above by the integration of the Navier-Stokes equations in the rotor flow field.
Many turbulence models for aerodynamic simulations, such as Baldwin–Lomax, RNG k-ε, Spalart- Allmaras, etc., have been evaluated for the ability of simulating this type of complex flow.
Therefore, the SST k-ω model was chosen for the present simulations in the following work.
As illustrated in Fig. 1 two–dimensional CFD model is used to represent the VAWT and the wind tunnel domain.
Flow simulation parameters.

Simulation of Liquefied Natural Gas (LNG) Fluid Flow on Ambient Air Vaporizer M.A.
The hexagon vaporizer model is designed using Solidworks, and heat transfer model is simulated using computational fluid dynamics (CFD) tool, Ansys Fluent solver.
Detail dimension of hexagon AAV (a) Isometric view of the model (b) Top view of the model CFD Simulation Geometry Modelling In this simulation phase, only a row of the finned tubes with total of 6 finned tubes is considered due to the limitation of time, vaporizer size and hardware specification.
Comparison of LNG temperature with previous study To validate the simulation model that is developed in this study, results from simulation are compared with the other literature.
Liu et al., is then used to validate the simulation results.

The numerical simulation was performed by making use of the commercial CFD code which discretizes the solution domain into quadrilateral elements and use a numerical finite volume method coupled with a multigrid resolution scheme.
The governing equations were numerically solved using the commercial computational fluid dynamics (CFD) solver Ansys Fluent [10].
The width of the nozzle output is thus equal to 2,565 mm and the diameter ratio is equal to 0,905 The numerical simulation is performed by using a commercial CFD code ANSYS Fluent which uses the finite-volume method to discretize the equations of fluid flow.The flow governing equations are solved by using the k-epsilon and k-omega models with a performed coupled algorithm to treat the pressure terms in the momentum equations.
In the simulations, the convergence is defined when the residuals are reduced below 10-4 400 100 Air 53.88 48 .75 Fig. 1. 
Turbulence Modeling for CFD, 3rd ed., DCW Industries, Inc.

The numerical simulation for the flow characteristics of multiphase flow fields in the multiple-blade mixing agitator is carried out by means of combining of the large eddy simulation (LES) and multiphase flow model.
With the development of CFD technology, numerical simulation methods are taken to study the flow characteristics in the mixing process [1-3], which not only save research funding but also get some dates that can’t be gotten from the experiment.
The turbulence model Large eddy simulation control equation is the averaged equation after filtering the N-S equation
CFD simulation of gas-liquid flows in stirred vessel equipped with rushton turbine: influence of parallel, merging and diverging flow configurations [J].
LES and URANS simulation of hydrodynamics in mixing tank: Comparison to PIV experiments [J].

Research on LPG dual-spark Ignition Engine Combustion by CFD Dongqing Zhou, Jun Li, Ying Gao, Dawei Qu; Qijie Liu State Key Laboratory of Automobile Dynamic Simulation, Jilin University, Changchun China zhoudq09@mails.jlu.edu.cn Keywords: Power Machinery and Engineering; LPG engine; Ignition Methods; Combustion process Abstract .To study the dual-spark ignition methods of combustion of LPG, numerical simulation is conducted on the lean burn LPG turbocharged engine by three-dimensional simulation software.
Fig.1 2D grids of combustion chamber Fig.2 CFD grids of chamber Experimental Validations Indicator diagram is one of the ways to check out the validity of the model.
So in the simulation the variation trend of temperature field can be understood as the spread trend of flame.
Through the simulation analyze the influence of dual-spark ignition mode to cylinder combustion of the engine.
This simulation provides the theoretical guidance for the performance optimization of a dual-spark combustion process.

The other two are designed by an inverse optimization method, which can modify the discrepancies between the CFD (Computational Fluid Dynamics) results and the linearized theory.
The pressure coefficient distributions of the Busemann biplane obtained by CFD technique is given in literature [5] (and).
In the simulation, the conservation form of Euler equations is solved by a finite-volume scheme.
Fig.5(a) shows the configuration of simulations with and .
Fig.5 Simulation model Some aerodynamic forces of different supersonic ring wings are illustrated in Table1 with and .

Simulation results of particle dispersion in the tank with various injection angles are conducted, displayed, and concluded.
Over the last few decades, computational fluid dynamics (CFD) has been used as a tool dealing with mathematical modeling of the problems.
This paper therefore presents some aspect of a simulation study on removing particles from the cleaning tank.
Numerical model The first step for simulation is to simplify the problem.
Xu, A zero-equation turbulence model for indoor airflow simulation, Energy and Buildings. 28 ( 1998) 137-144

Controlling Model In the course of numerical simulation, the k-ε model is adopted.
Numerical Simulation[7-10] Boundary Condition, Dispersing and Messing.
Before CFD computing on special problem, calculating area must disperse by messing.
Numerical Simulation.
Wang: The Principle and Application of CFD Software (Tsinghua University Press, China 2004) [10] Z.Z.

At present, there are three study methods of flow fluid problem including model experiment, theoretical analysis and numerical simulation.
Numerical simulation is economic, efficient, and it can eliminate the problems of the limitation of existing error and security in the practical model test[3].
Based on computational fluid dynamics (CFD) software fluent, this paper emphasized 3D numerical simulation of the flow field in the scrubber by adopting k-ε model to establish the mathematical model and using SIMPLE algorithm to calculate.
(1) The k equation is: (4) (2) Theε equation is: (5) Analysis of the flow field simulation Simulations are calculated by changing the flue gas entrance angles in the condition of only gas gets into the scrubber.
Industrial Safety and Environmental Protection, 2008, 34(9) [3] S.A.Dudek, J.A.Rogers, W.F.Gohara.Computational Fluid Dynamics(CFD) Model for Predicting Two-Phase Flow in a Flue-Gas-Desulfurization Wet Scrubber.