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Study of flow characteristics of oil and water in the process of stirring Zongrui Hao1, a, Juan Xu1, b, Haiyan Bie2, c Zhonghai Zhou1 1 Institute of Oceanographic Instrument of Shandong Academy of Science, Qingdao, 266001, China 2 College of Chemistry and Chemical Engineering of Ocean University of China, Qingdao, 266100, China ahaozr001@sina.com, bxujuan101066@163.com, csalany001@163.com Keywords: Stirring, Multiphase flow, Flow pattern, Numerical simulation Abstract.
Numerical simulation results and analysis As the density of oil is lower than water, the influence of oil-water is the combined action of the buoyancy and the shearing force in the stirring process.
CFD simulation of liquid-phase mixing in soild-liquid stirred reactor, Computers and Chemieal Engineering.

Name Section view Axonometric drawing Description Modal a Planar dimensions: 75m*75m Side interfaces on the windward side and the leeward side: Vertical Window height: 1.2 m Sash: center-pivoted type Modal b Planar dimensions: 75m*75m Side interfaces on the windward side and the leeward side: Tilting outward by 60° Window mode: The same as model a Model c Planar dimensions: 75m*75m Side interfaces on the windward side and the leeward side: Tilting inward by 60° Window mode: The same as model a Note: On the section views, air flows from left to right. 1.2 Determination of the air flow equation In the simulation based on Fluent software in this paper, the standard k-ε two-equation model, i.e. a semi-empirical model including a transfer equation about turbulent kinetic energy and another about diffusion rate, was used.
Table 5 Average Wind Velocities in the Seating Area in Different Models Model Average wind velocity in the gallery seat area on the windward side (m\s) Average wind velocity in the stall area on the windward side (m\s) Average wind velocity in the stall area on the leeward side (m\s) Average wind velocity in the stall area on the windward side (m\s) Model a 0.142 0.415 0.075 0.049 Model b 0.234 0.709 0.197 0.062 Model c 0.096 0.618 0.113 0.075 In the nephograms and vector diagrams about wind velocity simulation, the warmer the colors, the larger the corresponding wind velocities will be; the cooler the colors, the smaller the corresponding wind velocities will be.
Computational Fluid Dynamics Analysis: Theory and Application of CFD Software [M].
CFD and Architectural Environment Design [M].
A CFD-based test method for control of indoor environment and space ventilation [J].

Numerical Simulation of the cooling effect by air conditioner and spraying in high-temperature working face LIU Guan-nan a, GAO Feng b, JI Ming c, LIU Xing-guang d College of Science, China University of Mining &Technology, Xuzhou, 221000,China a guannanliu@126.coml, b ssnn521@126.com, c iflove0922@126.com, d youxiang_liu@126.com Keywords: stochastic model; working face; temperature field; SIMPLE algorithm.
A multicomponent turbulent model of the airflow in working face was modeled.And the simulation result is compared with the measured temperature.The temperature of the airflow along the transportation channel of working face goes up,and the gradient of the temperature curve is flat.Then the low-temperature droplets are simulated by stochastic separated flow model.The interaction between grains and fluid are simulated by adding source terms in conservation equations.The temperature curves of the airflow under different cooling schemes are investigated.If the air conditioner is in front of the nozzles,the temperature of the air near the inlet is low and uniform,and the cooling effect of the outlet is obvious.
The simulation result and the measured temperature in the transportation channel From Fig.1 shows that the simulation result well fits the measured data .The temperature of the airflow goes up along the channel,and the temperature difference between the inlet and the outlet is about 1℃.The model could be used for analyzing the distribution of the temperature in mine.
[5] Zhou Lixing.Simulation of turbulent two-phase flow and combustion.Beijing:Tsinghua university press,(1991) [6] Patankar S.V.Sparrow E.M.and Inanovic M.Heat Mass Transfer Vol.24.(1978) [7] Berlemont A,Grancher M S,Gouesbet G.
[9] Wang Fujun.Analysis of computational fluid dynamics-theory and application of CFD softwares..Beijing:Tsinghua university press,(1991)

Influence of Piston Initial State on HCCI Combustion in Micro Free-piston Engine Using Experiment Images and CFD Analysis Jin BAI Qian WANG Zhixia HE Penggang ZHANG School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China perking1984@yahoo.cn Keywords: free piston, micro engine, HCCI, visualization, numerical simulation Abstract：The visualization experimental setup of micro free-piston engine has been built, the process of single shot compression combustion in micro combustion chamber has been observed by the high-speed digital camera; Based on the propane combustion kinetics, the numerical calculation method for combustion process coupling with the free-piston movement was put forward, through editing the dynamic mesh subroutine in STAR-CD, the process of homogeneous charge compression ignition (HCCI) in the micro chamber was studied; The influence of piston initial state on HCCI combustion process was analyzed , indicating that the piston mass
In this paper, combined with the visualization experiment and numerical simulation method, the influence of piston mass and initial velocity on the process of HCCI in micro free piston engine was analyzed quantitatively.
Fig.2 Experimental setup Fig.3 The compression combustion process under different gap conditions Model validation.As the experiment work is developing gradually, the numerical simulation is also developing at the same time, validation of experiment and simulation results is necessary and meaningful.
Fig.5 makes good comparison of experimental and numerical simulation results, and more variable parameter simulation could be calculated.
Fig.4 Images from experiment Fig.5 A comparison of piston position data Results and discussion Simulation results under different piston mass.Fig. 6(a) to 6(c) show the simulation results of HCCI compression combustion under different piston mass conditions, the micro combustion chamber diameter is 3mm, the free-piston initial velocity is 30m/s, the equivalence ratio is 0.5, the initial temperature is 300K, the initial pressure is 0.1Mpa, and the piston mass are respectively 0.5g,1g,1.5g and 2g.

FDS (Fire Dynamics Simulator) [6] was developed by National Institute of Standards and Technology’s engineering laboratory is a computational fluid dynamics (CFD) model of fire simulation software.
The detailed design of the fire scene evacuation simulation is shown in Fig. 4.
Therefore, the simulation result was close to the actual situation.
By 210 s, the concentration reached its highest level in the simulation at 2700 ppm.
By the end of the simulation at 930 s, the CO concentrations ranged between 2300 and 2500 ppm.

Simulation of Initial Ribbon Formation during Planar Flow Melt Spinning Process M.
Fig. 1 Schematic of PFMS process Fig. 2 Air domain – A 3D model used in the simulation.
A 3D model is developed to simulate the ribbon formation during planar flow melt spinning process using commercial CFD software.
Temperature dependent viscosity and constant surface tension are considered for the molten metal during simulation.
Hence, simulations were carried out up to 1.2 ms with a time step of 1e-5.

The simulating calculation using Computer Fluid Dynamics (CFD) software and experimental test were conducted.
(2) Among them, ΔPw is wind pressure, Pa; K is aerodynamic coefficient, derived from wind-tunnel experiment or numerical simulation; ρ0 is outdoor air density, kg/m3; and vw is wind speed of uninterrupted incident flow, m/s.
Simulate the influence of indoor thermal environment by CFD software To conduct the research of the influence of ventilation methods on the indoor thermal environment and further perform the check analysis of calculation conclusions, the author uses Fluent software to further stimulate the calculation and verification of CFD value. 3.1.
Conclusion This thesis performs ventilation calculation, CFD simulation and analytical study of the use of unpowered fresh air exchange components in residential houses with southern orientation and good exposure in winter and spring in Beijing.

The author applied computational fluid dynamics (CFD) technology to numerically simulate the erosion law of the internal drill pipe in different drilling fluid displacement, different mechanical drilling speed and different cutting particle size.
CFD Model and Boundary Conditions.
The computational fluid dynamics (CFD) model established in this paper is shown in Fig. 1.
Fig. 2 Schematic diagram of meshing Internal Drill Pipe Simulation Results for Drilling Fluid Carrying Rock Erosion The influence of different factors on the erosion law of the inner drill pipe was analyzed by changing the initial conditions.
Numerical simulation of liquid-solid erosion in sudden expansion and contraction tube (in Chinese).

Transmission loss and characteristics of internal sound field of the composite muffler are calculated through sound and vibration simulation.
CFD Analysisof the Acoustic and Mean Flow Performance of Simple Expansion Chamber Mufflers [C]. 2004 ASME International Mechanical Engineering Congress and Exposition,2004 :151-156
[3] R Barmieri, N Barmieri, Finite Element Acoustic Simulation Based Shape Optimization of a Muffler [J].
Simulation Study on Noise Reduction Characteristics of Complex Structures of Muffler [J].
Simulation Study on Acoustics and Resistance Characteristics of Numerical of Muffler [J].

These simulation were conducted to find out the location of vibration for the first four modes.
Vibration amplitude of plate before and after attached with absorber Mode Amplitude (g) before Amplitude (g) after Percentage reduction % 1 0.0974 0.00642 93.4 Conclusion The finite element simulation approaches have been implemented successfully to investigate the vibration attenuation of fixed-fixed ends plate by employing single passive vibration absorber.
Khalid, CFD analysis of thin film lubricated journal bearing, Procedia Engineering 68 (2013) 56-62
Khalid, Simulation of laminar mixing in fractal perforated plate static mixers, Advanced Materials Research 845 (2014) 31-35
Khalid, CFD analysis of circle grid fractal plate thickness on turbulent swirling flow, Applied Mechanics and Materials 465-466 (2014) 109-113