Search results

Taking a subway tunnel as the research object and based on the CFD simulation method, this paper adopts a large eddy simulation analysis software FDS to simulate and analyze the effect of exhaust velocity on fire smoke control under the condition of the same longitudinal ventilation velocity in subway tunnel.
Simulation scenarios are shown in Table 1.
When the simulation time is at 150s, the temperature got to increase.
At the end of the simulation, the temperature reached 65℃.
Thus, it makes the change of the temperature be measured earlier than that of visibility. 4 Conclusion Taking a section of 500m long subway tunnel as research object and based on CFD simulation method, this paper simulate and analyze the effect of different exhaust velocity on fire smoke control.

So, to handle with the CFD problem using LBM, there is just need to solve streaming and colliding function.
For some simulations, modeling the flow in a right way or not is depended on the implementation of boundary condition.
Lid-driven cavity flow problem is a benchmark problem to validate novel CFD algorithm and provide theoretical basis for some engineering design.
And, the simulations of lid-driven cavity flow with different inflow angles are implemented in section 3.
The implementation of boundary condition in D3Q19 LBM is critical for simulation.

Analysis of oil-water-gas three-phase flow in a curved leaking pipe Boniek Evangelista Leite1a, Severino Rodrigues Farias Neto1, 2b, Antonio Gilson Barbosa Lima1, 3c, Ligia Rafaely Barbosa Sarmento1, 4d. 1Federal University of Campina Grande, Campina Grande, Brazil aboniek3@gmail.com, bfariasn@deq.ufcg.edu.br, cgilson@dem.ufcg.edu.br, ligiarafaely@hotmail.comd Keywords: multiphase flow, leak pipe, CFD Abstract.
All simulations were carried out using the Ansys CFX® 12.1 commercial code.
Methodology Mesh and geometry Figure 1 illustrates the geometry and the numerical mesh used. 4 m 100 mm 4 m In Curve Leak Out The computational fluid dynamics software used for numerical simulations conducted was Ansys CFX 12.0 and the construction of geometries and meshes were built using ICEM CFD.
The fluid properties used in the simulation of the oil leakage in a duct with a curve 90 are shown in Table 1.
Parameters oil water Gas ρ [kg/m3] 868.7 997.0 0.714 μ [Pa.s] 0.044 8.889x10-9 1.118x10-9 Bubble Diameter [µ] - 100 - droplet size [µ] - - 100 The boundary conditions used in the simulation of the oil leakage in a duct with a curve of 90 degrees are shown in Table 2.

However, with the fast development of computer technology and computational fluid dynamics (CFD) during the past two decades, numerical simulation has become one of the common methods used to investigate the fluid-structure interaction problems.
Currently, RANS codes are becoming more and more popular in VIV simulations.
Simulations of 2-dof circular cylinder at low Reynolds number are performed.
Journal of Southeast University (Natural Science Edition), Vol. 35, SUP Ⅰ (2005), pp. 35-39 [17] Xu Feng, Ou Jin-ping, Xiao Yi-qing: CFD numerical simulation of flow-induced transverse vibration of a square cylinder.
Journal of Harbin Institute of Technology, Vol. 40, No. 12 (2008), pp. 1849-1853 [18] Xu Feng, Ou Jin-ping, Xiao Yi-qing: CFD numerical simulation of flow-induced vibration with different cross-section cylinder.

CFD Numerical Simulation Establishment of the Physical Model and Mesh.
CFD Simulation.
With air-water as the simulating media, the average of the continuity equation and the NS equations were created by commercial CFD software—fluent.
The velocity distribution near the wall is obtained from the simulation results of the speed of images.
The liquid flow in this area is therefore read according to the simulation result.

Based on the wind resistant design of a super long suspension bridge —the Aizhai Bridge, which is located in the mountainous area and designed across a deep valley with a main span of 1176m, as shown in Fig 1, in this paper, the commercial CFD software FLUENT is used to simulate mountainous valley terrain and investigate the characteristics of the local valley wind field as well as its effects on the wind design.
One of the difficulties encountered in the simulation is the construction of the large scale digital terrain model with suitable resolution.
Fig 1 Perspective view of the Aizhai Bridge Fig 2 Domain of integration for simulation Fig 3 Point-cloud data of the selected domain Fig 4 Three dimension terrain surface generated Mesh of the domain After the surface model of the terrain was generated, it can be input into the CFD software of FLUENT to form the volume for the numerical simulation.
It is well known that the best numerical mesh is the result of a compromise between computer simulation requirements (memory and time), accuracy, and topographical resolution.
The volume of simulation domain was separated into two parts from the height of 300m above the surface for the purpose of generating better meshes.

A Novel Design of Air-cooled Battery Thermal Management System for Electric Vehicle Jiang Chao a, Tang Zhiguo b*, Hao Jiaxin c，Li Huiqing d School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei, 230009, China ahfutjiangchao@mail.hfut.edu.cn, b*tzhiguo@hfut.edu.cn, chaojiaxinxin@163.com, dlihuiq@mail.hfut.edu.cn Key words: Battery pack; Thermal management system; Simulation.
Visualized simulation analysis of the thermal management system is carried on under different working conditions by CFD, then the structure parameters will be optimized.
In this paper, a novel air-cooled thermal management system is designed, and simulation analysis of the thermal management system will be carried out to optimize the structure parameters of battery pack, and to evaluate the thermal performance of cooling and preheating conditions. 1.
Transient simulation has been conducted by CFD under high-temperature and low-temperature conditions.
Numerical simulation results of final project The battery arrangement of Option 2 is adopted in the end, two fans work alternately and the work cycle is 120s, and the power of the evaporator and the heater are both 400W.

In this paper, an urea spray model is established and simulated by CFD software FIRE with different nozzle structure parameters such as nozzle hole number, nozzle hole chamfering and spray angle.
Fig. 1 shows the simulation modeling of urea spray.
Simulation results of 4 nozzle hole.
Simulation results of 8 nozzle hole.
Wen: Muti-dimensional Numerical Modeling of Spray Mixing Process in Desiel Engines Bsed on CFD(PhD thesis, Huazhong University of Science and Technology 2004).

The method of manufactured solutions is used to examine the global discretization error and finally a comparison between finite volume particle method simulations of an incompressible flow around a fixed circular cylinder and the numerical simulations with the CFD code ANSYS FLUENT 14.0 is presented.
Simulation of incompressible flows is a very important topic in computational fluid dynamics [7].
Simulation of flows over a cylinder is a fundamental fluid mechanics problem of practical importance.
We chose an evaluation of FVPM data with CFD data for flow over a fixed circular cylinder at Reynolds number of 200.
Layton, Mathematics of Large Eddy Simulation of Turbulent Flow, Berlin, Springer Verlag, 2006

With the rapid development of computer technology, many scholars have used CFD to study the three-dimensional flow field in a pump [1,2,3].
Numerical Simulation Results and Analysis Pressure Distribution on Pressure Side and Suction Side of the Impeller Vane.
The reason is that the numerical simulation is a kind of flow calculation based on some assumptions.
The heads obtained by numerical simulation under all three conditions are close to that measured in the experiment.
[5] PAN Xiaoqiang and YUAN Jing, Numerical simulation of engineering fluid by using CFD software, Journal of Nanjing Institute of Technology (Natural Science Edition), 2 (2004) 62-66.