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Simulation Analysis on Smoke Characteristics of Tunnel Fire with Different Cross Passage Interval Xin Hana, Beihua Congb and Xiaoming Wuc Shanghai Institute of Disaster Prevention and Relief, Tongji University, Shanghai 200092, China Tongji Antai R&D Center of Engineering Disaster Prevention, Shanghai 200032, China ahanxin@tongji.edu.cn, bbhcong@tongji.edu.cn, cWuxm@tongji.edu.cn Keywords: road tunnel fire, cross passage interval, counter-flow smoke, CFD simulation Abstract.
In this paper, the FDS simulation model is constructed according to the mentioned tunnel geometry.
The tunnel length adopted for simulation analysis is 800m long and the ventilation mode is central smoke extraction system.
Table 1: Summary of simulation calculation cases Simulation scenario Case a Case b Case c Case d Cross passage interval L[m] 200 300 400 500 FDS simulation result and analysis Counter-flow smoke characteristics.
T Through the simulation calculation of above four cases, the simulation results display that all the four cross passage intervals could produce definite influence on tunnel smoke characteristics.

But the side roughness analysis usually requires a simulation with individual particles considered.
This efficient way avoids the time-consuming calculation of multilayer simulation, but including the key parameters of whole process.
This was carried out by the computational fluid dynamics (CFD) model.
The following simulation cases are all meet this requirement and thus the morphologies of tracks are analyzed in terms of side surface.
Fig. 4 Side roughness under different heat input, data from both simulation and independent literature.

Simulation of Flow Pattern in MOHVPE Growth Chamber Computational simulation of the reactor geometry was conducted by using CFD/SOLIDWORKS flow simulation software [7].
The main objective of this simulation is to predict the performance of the proposed reactor in terms of flow pattern.
Fig. 3: (a) Uniform meshing of the growth chamber and (b) middle holder stressed out as an observation in simulation.
The simulation was based on the modification of different parameters at each stage.
By using the simulation it is also possible to design the mask for selective area.

The comparison and analysis, under the certain vacuum degree of the vacuum chamber, was done between the simulation and the experiment.
And the differences of the vacuum degree in the chamber, the temperature change of the cabbage, the relative humidity in the chamber and the cabbage mass loss, in the experiment and the simulation, were all recorded.
Da wen Sun, Ze hua Hu, CFD simulation of coupled heat and moisture transfer through porous foods during vacuum cooling process, International Journal of Refrigeration, 19-27, (2003)(26) [8].
Da wen, Sun Ze hua Hu, CFD predicting the effects of various parameters on core temperature and weight loss profiles of cooked meat during vacuum cooling.

Study on the influence of Meteorological Conditions on Particles distribution in Residential Environment Cao Yong1, a, Wang Jianeng2,b, Liu Jing2,c, and Yu Dan3,d 1Institute of Building Environment and Energy Efficiency, China Academy of Building Research, 2Unvirersity of Science and Technology Beijing 3 Beijing University of Civil Engineering and Architecture acabrcao@sina.com, bJianeng_Wang@163.com, cjingliu1998@ustb.edu.cn, dyudan@bucea.edu.cn Keywords: Particulate matter, Residential environment, Weather conditions, CFD Abstract.
And in Hong Huang’s [2] conclusion through numerical simulation, the distribution of pollutants concentration depends on the wind flow and geometric structure of the street canyon.
In this paper the influence of meteorological conditions on the particle diffusion will be researched and the method of numerical simulation will be used.
Conclusions In this paper the distribution features of Particulate matter in residential environment is studied using the method of numerical simulation and considering different wind speed, different wind direction, and different diameter of Particulate.

The result of numerical simulation is forward-looking, it can predict law of explosive ignition.
Since then, a lot of cook-off numerical simulation had been conducted.
CFD software was applied to simulate the model above.
The cook-off test and its numerical simulation of RDX[J].
Numerical simulation of cook-off for explosive at different heating rates[J].

The simulation model of blades in PECM.
Coupling Simulation Coupling Method.
Material and Simulation Parameters．In this simulation, the materials of the cathode and anode are Ti-6Al-4V and electrolyte is NaNO3 solution.
Simulation parameters.
Turbulence Modeling for CFD. 2nd ed.

The measured results were compared to simulation results.
Simulation.
These values are in agreement with a preliminary simulation of the high pressure gas quenching using the CFD-program Fluent [12].
A 3 dimensional simulation of the case hardening process using a position dependent heat transfer coefficient taken from a CFD-simulation of the gas flow may also help improving the results.
In order to improve the simulation results, 3 dimensional simulations with enhanced streaming simulation of the gas quenching process should be employed.

Performance Analysis of Bionic Propulsion Device above Water in Different Parameters Xianghua BAI1, a, Fenghe TAO2, b and Jiangang LV3, c 1,2,3Machine Engineering College, Shijiazhuang Hebei, 050003, China baixianghua@163.com Keywords: Amphibious vehicle; Bionic propulsion; Angle; Immerged in water; Simulation Abstract: This paper mainly researched on hydrodynamics performance of a wheel-blade bionic propulsion device designed based on the mechanism of a basilisk lizard treading water, when immerged in water and in different angles.
Fig.1 The theory analysis of basilisk lizard Fig.2 The wheel-blade bionic propulsion treading water device immerged in water Simulation and Analysis Modeling and Simulation enactment.
In the simulation，adopted RNG onflow model[3], for this model has perfect performance to solve the hydrodynamic problem, 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.
Through the simulation and analysis hydrodynamics performance of the bionic propulsion device immerged in water and in different angles, summarized the rules and features of the revolving movement for bionic impeller and established the groundwork of optimizing the design of the bionic propulsion device further.
[3] Fujun Wang:The Theory and Application of CFD Software(Tsinghua University Press, Beijing 2004),in Chinese

This book covers these topics: Acoustics and Noise Control, Aerodynamics, Applied Mechanics, Automation, Mechatronics and Robotics, Automobiles, Automotive Engineering, Ballistics, Biomechanics, Biomedical Engineering, CAD/CAM/CIM, CFD, Composite and Smart Materials, Compressible Flows, Computational Mechanics, Computational Techniques, Dynamics and Vibration, Energy Engineering and Management, Engineering Materials, Fatigue and Fracture, Fluid Dynamics, Fluid Mechanics and Machinery, Fracture, Fuels and Combustion, General mechanics, Geomechanics, Health and Safety, Heat and Mass Transfer, HVAC, Instrumentation and Control, Internal Combustion Engines, Machinery and Machine Design, Manufacturing and Production Processes, Marine System Design, Material Engineering, Material Science and Processing, Mechanical Design, Mechanical Power Engineering, Mechatronics, MEMS and Nano Technology, Multibody Dynamics, Nanomaterial Engineering, New and Renewable Energy, Noise
and Vibration, Noise Control, Non-destructive Evaluation, Nonlinear Dynamics, Oil and Gas Exploration, Operations Management, PC guided design and manufacture, Plasticity Mechanics, Pollution and Environmental Engineering, Precision mechanics, Mechatronics, Production Technology, Quality assurance and environment protection, Resistance and Propulsion, Robotic Automation and Control, Solid Mechanics, Structural Dynamics, System Dynamics and Simulation, Textile and Leather Technology, Transport Phenomena, Tribology, Turbulence and Vibrations.