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Numerical Simulation of the Laminar Flow Field in Stirred Tank with Double layer Combined Impeller Stirring Eccentrically* Yingna Liang1, a * 1Liren College, Yanshan University; College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China aliangyingna@ysu.edu.cn Keywords: stirred tank; double layer combined impeller; stirring eccentrically; computational fluid dynamics(CFD); laminar model Abstract: Computational fluid dynamics (CFD) method was applied to study the flow field in cylindrical stirred tank mixing non-Newtonian fluid with double layer combined impeller of upper-straight-blade and lower-inclined-blade.
The CFD method was applied to study the flow field in laminar flow stirred tank in this paper.
[3] Guozhong Zhou, Yingchen Wang, Litian Shi, CFD study of mixing process in stirred tank, J.
[7] Kei Sakakura, Takeo Shiojima, Satoru Yamamoto, Numerical simulation of double helical ribbon agitators using three-dimensional DEM simulation, J.
Zhu, Numerical simulation of turbulent batch mixing in a vessel agitated by a rushton turbine, J.

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.

Stress of pressurizer surge line due to stratification is calculated with the help of finite analysis software, using both simplified temperature distribution and the temperature fields of CFD simulation result.
Thus, fluid field can be calculated independently and the CFD results are taken as the source of FEA of pipe solid.
To be accurate, the temperature field is computed by CFD method.
Although the temperature calculated by CFD method is more consistent with the reality, the computation takes too much time on stake.
Results from CFD temperature field.

In 2005, S.H.Noie[2] indicated that the lowest effectivenessof heat exchanger would avoid the heat capacity rate equal to 1 according to simulation and experimental results.
Therefore, the case 3 was selected in the following simulations that to reducing computing time.
Fins pitch is the minimum impact parameter in this simulations (about 1%), because increasing pitch would reduce turbulent intensity in the heat exchange process.
Ponnusamy, “Effectiveness charts for counter flow corrugated plate heat exchanger,” Simulation Modelling Practice and Theory, Vol. 19, (2011), pp. 777-784
Subramanian, “CFD Modeling of Compact Offset Strip-Fin High Temperature Heat Exchanger,” University of Nevada, Las Vegas, (2005)

In addition, the use of Computational Fluid Dynamics (CFD) in the validation and verification work is discussed.
In order to meet these goals, process models are needed for cost-efficient modelling and simulation of the unit processes.
Then, the average plume diameters of two converters with different geometries were approximated by CFD modelling [9, 10].
Here, CFD simulation [4] was used to obtain the mass transfer coefficients for supersonic blowing through a one-hole lance.
Fabritius: CFD Modeling of a Super-Sonic Top Blown Lance - Development of New Gas Heat and Mass Transfer Correlation.

Results and discussion A simplified Siemens reactor is used in the present simulation study.
The computational domain was divided by hexahedral elements using ICEM CFD 14.0.
Four gas phase reaction mechanisms (Ho’s detailed gas phase reaction mechanism, Cavallotti and Masis’ global, radical and disilane gas phase reaction mechanisms) were employed in the computational simulations using the commercial CFD software Ansys Fluent.
Kinetics of SiHCl3 Chemical Vapor Deposition and Fluid Dynamic Simulations.
Modeling and simulation of silicon epitaxial growth in Siemens CVD reactor.

In this study, to improve the machining efficiency (processing time) by using end mill, a prototype of end mill with internal coolant nozzles (both rake side and flank side) was designed and CFD (Computational Fluid Dynamics) simulations were conducted to find out the relatively effective coolant supply method for coolant penetrating in cutting zone of flank face mainly.
Coolant nozzle outlet CFD Simulations The simulations were completed by MSC Cradle.
In the future research, CFD simulation will be conducted with molecular scale coolant as in cutting experiments coolant was sprayed out into mist instead of liquid.
Data acquisition location Fig. 9 shows the simulation results on data point 2 in Fig. 8(a).
Results of CFD simulations Cutting Experiments The cutting experiments were conducted to verify the real effect of UHPC in the cutting of Ti-6Al-4V.

CFD Computational Fluid Dynamics Analysis Numerical simulation of fluid flow is to discretely work out the equations of fluid dynamics of air flow on the computer and vividly express the results with computer-aided graphics technology.
The numerical simulation technique is so called computational fluid dynamics (CFD) technology.
Since 1974, a great number of researches on built environment simulation with CFD technology have been carried out.
Nowadays, CFD technology has accomplished great achievements in architectural environment and device simulation.
The application of CFD technology in the analysis of residential wind environment [J].

Three-dimensional Wind Field Simulation on the Two Typical Roofs of the Building Shuqin Liu1 ,Zhongguo Bian1 ,Yuanbo Cai2 ,Fang Zhao2 1.
This paper mainly analyzed the basic situation of three-dimensional wind field around the buildings with the theoretical analysis and CFD numerical simulation method.
This paper presented the wind flow condition around the flat roof building and pitched roof building by Computational Fluid Dynamic (CFD) technique, including the wind energy on building roof.
In this simulation turbulent flow equation adopted standard k-e model.
Fig.7(a) Wind velocity ratio for α=0° Fig.7(b) Turbulence intensity for α=0° 3 Conclusions CFD simulations for the cuboids buildings have been performed, and analyzed the wind energy of building rooftop at different roofs and different wind directions.

Numerical simulation of the natural ventilation in workshop with different air inlet openings Yaxin Su1, a, Xin Wan2,b 1 School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China 2 Wuxi City College of Vocational Technology, Wuxi 214011, China asuyx@dhu.edu.cn , bwanxin840207@163.com Keywords: natural ventilation; industrial workshop; numerical simulation; air inlet opening Abstract.
With the development of numerical simulation methods, computational fluid dynamic (CFD) modeling is widely used by many authors to study fully the natural ventilation process.
In this paper, the authors numerically investigated the natural ventilation in a workshop with heat sources based on CFD method.
Sketch of workshop Numerical model and simulation method.
Realizable k−ε turbulent model was selected for the CFD calculation after several trial calculations and comparison to related experimental data.