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Introduction The most important factor in the erosion of hearth is the circuiting flow of hot metal liquid while the mainly erosion in modern blast furnace is the erosion of elephant foot shape[1].Due to the dead-man zone in the center of hearth,the flow situation is so complicated that it can not be probed ,which needs to be calculated by mathematical or physical simulation,resulting that the consideration about the impact of sponginess in dead zone on the iron liquid circulation is essential.The word had been work as follows:Koki NISHIOKA and Taihei NOUCHI researched on the influence of the factors of diameter,position and shape of particles in dead zone on the drainage speed of iron slag[2,3,4];Sun Tianliang and Cheng Susen from Peking University of Science and Technology had made use of the CFD software to simulate the flow of iron liquid in hearth[5,6].In this essay,the research on the furnace of 1083 m3 in certain factory is done.The research is based on the related theory of the
Numerical simulation is conducted by ANSYS-CFX fluid simulation tool, it provides the standard N-S equations based on finite element method,which divides computing zone to 3D tetrahedron grid and the grid number is about 200000. the dead-man column in hearth is set as porous media, only the hot metal flow is considered in the process of simulation, and the hot metal temperature is constant.

., Tokyo University of Science, Yamazaki 2641, Noda, Chiba, 278-8510, Japan Keywords: FEM, Adaptive Analysis, Local Mesh Refinement, Hexahedral Mesh Generation Abstract. 3-D finite element method (FEM) is widely used as an effective numerical simulation technique.
In the simulation technique, accuracy is one of the most significant issues.
Adaptive mesh generation is highly required on CFD area.
Much work has been progressed for adaptive mesh generation for CFD, especially aerospace area.

The lift curve of the whole aircraft without control surface deflection is gained by CFD calculation which is corrected by wind tunnel test data [3], as is shown in Fig. 1.
The Simulation of Take-off Constitution.
Johnson: Use of flight simulation to complement flight testing of low-cost UAVs.
AIAA 2001-4049, Modeling and Simulation Technologies Conference.
[8] Johnson E N, Mishra S: Flight Simulation for the Development of an Experimental UAV.

Hydrodynamic Performance Analysis of the Bionic Impeller Equipped with Little Angle Arc Lamina BAI Xiang-hua1, a, LV Jian-gang 2, b, Zhao Zhi-ning 3, c , 1,2,3Machine Engineering College，Shijiazhuang Hebei China 050003 abaixianghua@163.com Keywords：Lamina; Shape; Arc; Hydrodynamic Performance; Simulation Abstract：This paper mainly imagined and designed a bionic impeller with arc shape lamina especially little arc lamina, researched on its hydrodynamic performance on the base of the prior hydrodynamic performance research on straight panel shape lamina.
Fig.3 Impellers with different acr shape laminas Through analysing the features of different arc shape laminas, the paper mainly selected the impeller with little arc shape lamina (as shown in Fig.3-a, was 300 ) , and researched its hydrodynamic performance by FLUENT software simulation when its depth h is at -7.5 cm, 0 cm and 7.5 cm, discussed and analyzed the rules of hydrodynamics when h was altering, tamped the groundwork of optimizing the externality design of the bionic impeller further.
Simulation and Analysis Modeling and Simulation enactment.（1）First constructed three dimension sculpt of bionic impeller with little arc shape lamina and its depth h is at -7.5 cm, 0 cm, 7.5 cm, and then used GAMBIT software to actualize gridding partition, as shown in Fig.4.
In the simulation, adopted RNG onflow model, for this model has perfect performance to solve the hydrodynamic problem[4,5], Applied UDF to define the angle velocity of the bionic impeller as , and then initialized up-half part of control box as air and the other was liquid.
[4] Fujun Wang:The Theory and Application of CFD Software(Tsinghua University Press, Beijing 2004),in Chinese

A Design-Variable-Based Computational Study on the Unsteady Internal-Flow Characteristics of the Urea-SCR Injector for Commercial Vehicles Chang-Su Kim1,a and Sung-Young Park2,b* 1Unit B-217, 282 Haguiro, Dongan-gu, Anyang-si, Gyeonggi-do, 14056, Republic of Korea 2Division of Mechanical & Automotive Engineering, Kongju National University, 1223-24 Cheonandaero, Budae-dong, Seobuk-gu, Cheonan-si, Chungnam-do, 31080, Republic of Korea akcs0817@gmb.co.kr, bsungyoung@kongju.ac.kr Keywords: CFD, Flow coefficient, Nozzle angle, Nozzle-hole area, Responsiveness, Urea-SCR injector Abstract.
To find out the mean flow coefficient and the responsiveness according to the design variable, a 3D model was generated for the simulation based on the reverse engineering.
The urea solution is a chemical substance that is made from the mixing of water and urea, where the chemical characteristics differ according to the urea-mixing ratio; however, due to the physical characteristics that are similar to those of water, the analysis was conducted using the water property of this simulation [8, 11].
The mean flow coefficient is the ratio of the theoretical flow to the mass flow in the simulation, and as it is close to 1, it is close to the theoretical flow.
Neumaier et al., Optimisation of Catalytic Converter Gas Flow Distribution by CFD Prediction, SAE Technical Paper 930780 (1993)

., Qiqihar Heilongjiang Province, China ahustyuxiaodong@163.com, bxiawa-1972@163.com, cwbdoctor@sina.com Keywords: Annular cavity, Multi-pad, Hydrostatic thrust bearing, Temperature field, Simulation research Abstract.
A simulation research concerning temperature field of hydrostatic thrust bearing having annular cavities multi-pad was described in order to solve the thermal deformation of the hydrostatic thrust bearing with annular cavity multi-pad in the heavy CNC equipment.
The simulation results indicate that an improved characteristic will be affected by rotating velocity easily, and oil cavity temperature increases by gradually with rotating velocity enhancing.
Numerical simulation Model of multi-pad.
Three-dimensional geometry model of the oil film is produced by software UG, then the model is introduced into the pre-processor ICEM CFD to generate grid.

So far Computational Fluid Dynamics (CFD) has focused on grid‐based methods, where two different frames are usually considered for describing the physical governing equations, namely: the Eulerian and the Lagrangian description (Table 1).
The development of mesh free methods offers a reliable approach to tackle the simulation of such difficult problems.
In numeric simulation, larger resolution will help reduce errors, which are inevitable in floating point calculation; larger problem domain often means more analogy with realistic experiment and better simulation result.
For this reason, numerical simulation about tsunami wave from submarine slide are very necessary.
The development of mesh free methods offers a reliable approach to tackle the simulation of such difficult problems.

The numerical simulation was used in this orthogonal test.
The numerical simulation was performed with Standard k-ε turbulence model implemented in the FLUENT 6.2 code.
This confirmed the feasibility of predict the deep-well pump performance by numerical simulation method.
Compared the results obtained by testing with the numerical simulation results, the change trend of efficiency and head obtained by numerical simulation basically consistent with test results.
“Estimation and experiment of axial thrust in centrifugal pump based on CFD,” Transactions of the Chinese Society for Agricultural Machinery, vol.40, 2009, pp. 60-63.

Analysis and Simulation of the Fumigation Treatment Bed Working Condition The product design and development, ultimately respond to human, and need to make an analog simulation analysis of the fumigation treatment bed practicability.
Through the analog simulation of the simulation software can be more intuitive to analyze the model in the practical application environment.
In the simulation add a tail air inlet.
Summary and Conclusion The paper is based on ergonomics and combined with the physical parameters of Chinese population. 1) Given the specific requirements of each part of the fumigation treatment bed design, and has carried out the entity modeling. 2) Using CATIA software and simulation software to carry out simulation analysis of the fumigation treatment mechanism, simulation for temperature field and flow field inside the fumigation cabin carried out by CFD flow field simulation software. 3) Come to distribution of temperature field and flow field inside the fumigation cabin under different working conditions.
Pei, Numerical simulation of flow in room, Refrig.

Energy Procedia 100 (2016), PP.412-422. ] as it uses Computational Fluid Dynamics (CFD) models which can predict temperature distribution with an acceptable and reliable result [[] Mohammad Baharvand et all, Design Builder Verification and Validation for Indoor Natural Ventilation, Journal of Basic Application Science Research 3(4) (2013), PP. 182-189. ,[] Cheung, J.
P., Liu C.H., CFD Simulations of Natural Ventilation Behavior in High-Rise Buildings in Regular and Staggered Arrangements at Various Spacings, Journal of Energy and Buildings 43 (2011), PP. 1149-1158. ,[] Qingyan Chen., Ventilation Performance Prediction for Buildings, A Method Overview and Recent Applications, Journal of Building and Environment 44(4) (2009), PP. 848-858. ].
Computer Simulation.
The main engine of simulation in Design-Builder is Energy Plus; the Simulation results are compared with experimental data at different times on the hot summer days of the year (July 28th to Aug 2nd, 2019) as shown in Fig. 4.
Fig. 5.The difference value between measured and simulation data in indoor temperature of models.