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Simulation Analysis of Metal Flow during Extending Extrusion Semisolid AA2017 Alloy Renguo Guan 1,a, Zhanyong Zhao 1,b, Chao Lian 1,c, Qiusheng Zhang 1,d, Chunguang Dai 1,e, Chunming Liu 1,f 1School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China a guanrg@smm.neu.edu.cn, b syuzzy@126.com, c lichaaa@126.com, d zxzqs@163.com, e daichunguang@163.com, f cmliu@mail.neu.edu.cn Key words: Semisolid, Extending extrusion, Aluminum alloy, Finite element model, Flow velocity.
Metal flow during the process was analyzed by the finite element simulation.
The simulation object in the mould is shown in Figure 1(b).
Figure. 1 (a) Sketch of semisolid extending extrusion (b) The simulation object in the mould In a steady state, AA2017 alloy in the forming mould were investigated as research objects.
FLOTRAN CFD element in ANSYS program was chosen for calculation.

Introduction The need for predictive simulation methods for turbulent flows has led to a significant interest in large-eddy simulations (LES) in recent years.
The large eddy simulation for this problem has been performed extensively by different research groups [14] .
Kolbe, New insights into large eddy simulation, Fluid Dyn.
Fujii, Progress and future prospects of CFD in aerospace —— Wind tunnel and beyond, Progress in Aerospace Sciences, 41(2005) 455–470 [12] Wang Z J.
Blaisdell, A time-implicit high-order compact differencing and filtering scheme for large-eddy simulation, Int.

Major components of the power train are modeled using the simulation software Simulink.
Based on power track control strategy, the simulation results show that the proposed new design method and parameter design theory of electric motors for hybrid construction equipments are reasonable.
Then the optimal conceptual design can then be finalized with the use of FEA and/or CFD.
Major components of the electric drive system are modeled using the simulation software Simulink based on calculation results (see in Fig. 4) [10, 11].
Fig. 4 Simulink model of power train for crawler dozers Simulation is researched based on typical conditions (see in Fig. 5).The simulation results (see in Fig. 6) show that the working points of the motor are mainly in the region of high speed low torque and efficiencies of the motor is between 85%-90% under the transport conditions.

X.P Lu [3] uses CFD method to simulate indoor temperature field of air -conditioned room in which the position of split air conditioner is different.
Numerical Simulation Physical Model .This study is about a fourth floor office in Hengyang.
In the simulation, some assumptions were made to the window gap for the restrictions of mesh size and calculation, which might bring a certain impact on the simulation results.
Thus, some work can be done to improve the simulation in the following time.
Lei Jin for assisting numerical simulation.

Factors Affecting the Performance of Molten Salt Heat Receiver Peijuan Li1, a, Yuting Cheng1,b and Shi Liu2,c 1School of Power, Energy and Mechanical Engineering, North China Electric Power University, Beijing 102206,China 2 School of Control & Computer Engineering, North China Electric Power University, Beijing 102206,China alipeijuan1234@sina.com, bcytko@126.com, cliushi_ncepu@yahoo.com.cn Keywords: Tower solar power; Numerical simulation; Molten salt receiver Abstract.
The computational fluid dynamics (CFD) software was applied to numerically simulate the wall thermal conductivity and heat convection of the molten salt flow.
Numerical Simulation Results Temperature Distribution and Velocity Distribution of Molten Salt in the Heat Receiver.
In Figure 3, and Figure 4, the molten salt inlet flow rate of l.8m / s, inlet temperature of 585K, the distribution of radiation heat flux to change with the axial direction , which is shown in Figure 2. it is achieved by the udf(User Defined Function) in the numerical simulation; Fluid properties of molten salt changes with the temperature.
Figure 6 shows the result of numerical simulation, with velocity of molten salt in heat receiver increasing, temperature difference from inlet surface to outlet one reduce in parabola relation.

The Simulation and Comparative Analysis of the Different Structure of Cyclone Separator, and the Construction of Optimal Experimental Model Ning Xu1,a , Yue Xu2,b 1.
During trajectory simulation, the coal dust was set as particles and the computed fields were segmented and grid meshed, and computed using pressure base solver.
The simulation of dynamic pressure and static pressure in the optiaml cyclone separator were shown in Fig.6.
After stimulation of the internal pressure convective cloud, the XY curve was drawed using CFD software.
Simulation of mass-loading effects in gas-solid cyclone separators.

To study the effects that land layouts around the square lay on the city square microclimate in winter cities, this paper takes St Alekseev Church as a model and uses the method of numerical simulation CFD to study 8 different land layouts in winter climate conditions.
It takes wind velocity and relative temperature field into consideration mainly in the simulation when analyzing the square microclimate.
According to winter meteorological data in Harbin, the average temperature is-19.4℃in the coldest month-January 15th, so we set the simulation time at 11:15 in January 15th.
The results of wind velocity simulation can be seen in Table 2.
The results of temperature simulation can be seen in Table 3.

Furthermore, filling of a kind of panel was simulated, and the simulation results were analyzed.
（1） and According to consulting data and the knowledge of cfd obtained the best filling velocity of 200×150×10 plate casting is , followed .
Then it verified by the numerical simulation.
That Fills Process Numerical Simulation of The Present Situation and Development of Technology[J].
[10] GuoFaMi,xiangyuliu andkuangfeiwang development and application of numerical simulation for the mold filling process of casting [J].Journal of Henan Polytechnic University 2007, 26(3): 334-339.

Zhang Lühong[6], Zhang Wenqing[7], Feng Cunli[8] and other scientists use the CFD to make the numerical modeling of the distribution of the twin-tangential annular flow gas distributor and the two-line vane gas distributor, and the flow characteristics of the gas distributor is well revealed.
The article makes the numerical simulation of the internal flow field of the twin-tangential annular flow gas distributor and the two-line vane gas distributor, and make the systematic comparison of the gas pressure drop and uniform distribution of these two gas distributors.
The calculation results analysis and discussion The simulation uses air as the fluid medium, and takes the standard k-ε model as the turbulence model, the discretization of the momentum equation, the turbulent Kinetic Energy, and turbulent dissipation rate are solved by using first-order windward scheme.
[6] Zhang Wenqing.Computational fluid dynamics on vapor-liquid distributor in large-scale packed column and optimum design[D].Tianjin:Tianjin University,2004 [7] Feng Cun-li, Li Cheng, Li Yong-hui.Number simulation of the flow field in a twin-tangential annular flow gas distributor with FLUENT[J].Petro-Chemical Equipment, 2004,133(12): 25-27.

For this reason, the need for simulation of entire phenomenon is necessary.
Up to now, Computational Fluid Dynamic (CFD) has concentrated one’s attention to grid-based method, which two different frames namely: Lagrangian grid and Eulerian grid.
They are very popular method in numerical simulations to solve different problems in science and engineering.
Fig. 8 Results of numerical simulation about tsunami generated by submarine slide Conclusion The development of mesh free methods offers a reliable approach to tackle the simulation of such difficult problems.
Chadwick, Simulation of wave overtopping by an incompressible SPH model, Coastal Eng. 53 (2009) 723-735