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The Study of Vent Form of Double-Skin Facade Based on CFD Chuanhui Zhou a , Na Xue College of Urban Construction, Wuhan University of Science and Technology, Wuhan, China azhou3@126.com Keywords: double skin facade, thermal channel, PHOENICS, CFD Abstract: In this paper, taking a building in Wuhan as a case, the CFD method is used to simulate the air flow field and temperature field of respiration double-skin facade,and by analysis, we know how the position and size of air inlet and air outlet can influence the thermal performance , and their area ratio2:3 is suggested with staggered arrangement.
Meanwhile, according to the simulation results of the three models, we come to the conclusion that the special structures of double-skin facade can form natural convection heat transfer, take away the heat in channels and achieve the goal of energy conservation and consumption reduction.
Computation model and boundary condition This paper presents the numerical simulation of double-skin facade by using PHOENICS3.6.2 and the HVAC special module of FLAIR.
By numerical simulation, we can obtain useful conclusions on whether the upper vent should be larger or the lower should be larger.
CFD.

Quantitatively, the differences between experiment and CFD with respect to the velocity profile are acceptable.
Before presenting any result, a preliminary experimental test is compared to a CFD code (MaPFlow).
A brief introduction to MaPflow Eulerian CFD is by far the most popular simulation method in aerodynamics.
This is because the CFD and experimental data have similar velocity profile in the wake.
However, if we compare the deficit area only, the differences are not negligible (around 20%) The reason is that even though we have taken measures (honeycombs and screens) to reduce the flow turbulence for the wind tunnel experiment, essentially the flow are still not uniform while in the CFD simulation, the flow can be set to be uniform.

3D numerical simulation of the airflow in a Pneumatic Splicer Xiao Xing1, a and Guoming Ye1,b 1School of Mechanical Engineering, Donghua University,Shanghai, 201620,China alilyxingxiao@hotmail.com, bygm@dhu.edu.cn Key words:pneumatic splicer ; splicing chamber ; numerical simulation ; air flows Abstract.
Three-dimensional numerical simulation is conducted and standard K-ε turbulence model is used.
This work also shows that CFD technique can provide a better understanding of the behavior of the high speed air flow in the air splicing chamber.
Jianheng Zhou and Pengfei Qin [2] applied the Computational Fluid Dynamics (CFD) technology to the design of the pneumatic splicer.
Therefore, the standard K-ε model is only appropriate for the simulation of fully turbulent flow.

Sensitivity Analysis of the Air Flow Inside a Single Cylinder Engine for Different Turbulence Models Using CFD Felipe Grossi L.
However, when modeling internal combustion engines using CFD, the turbulence model choice is always a relevant problem.
Considering all the studies that are being developed in this field, the present paper aims to analyze different aspects of the cold flow inside an internal combustion engine chamber, using CFD simulations.
Therefore, the simulation starts at the 330º, the TDC occurs at 720º and the simulation ends at 1080º.
“A Rapid Cfd Simulation For Internal Combustion Engines”, Sae Paper 1999-01-1185, 1999

In order to investigate the conditions of heat transfer, thermal calculations were made and then numerical simulations using Computational Fluid Dynamics (CFD) were conducted.
Temperature distribution on the surface of the fins designated by CFD corresponds to the distribution designated analytically.
CFD methods are now widely used in the design of the process devices [4].
Using CFD in design of pneumatic pulsators has not yet been applied.
Thermal Analysis Using CFD The use of numerical simulation methods in computer aided engineering analysis enables fast and relatively accurate determination of results, the obtainment of which in an analytical way would be extremely difficult or even impossible.

CFD, as a powerful analysis technique develops very well.
The simulated results predicted by CFD model are consistent with experimental data.
CFD simulation model of milling cutters with different internal channels The present research selected three milling cutters with different interior channels, i.e., single direct hole, double direct holes and double helical holes.
Hence, cold air is used instead of Cryogenic oil mist in this CFD model.
So the velocity field of the CFD simulation model is available.

CFD Calculation of Wind Turbines Power Variations in Urban Areas Jafar Bazrafshan1,a, Payam Sabaeifard2,b, Farid Khalafi3,c and Majid Jamil3,d 1Department of Mechanical Engineering, Islamic Azad University Ayatollah Amoli Branch, Iran 2 Faculty of Mechanical and Energy Systems, Power and Water University of Technology (Abbaspour University), Tehran, Iran. 3 Department of Energy, Materials and Energy Research Center, Karaj, Tehran, Iran.
In this paper, to examine variations in efficiency of wind turbines in this condition, two models of H-Rotor and horizontal axis wind turbine analyzed based on axial momentum theory through computer simulations.
Simulations conducted through CFD method and k-ε turbulence model was utilized to analyze flow fluctuations in Navier-Stokes equations.
In order to increase precision of simulation, firstly one actuator disk and then two actuator disks developed in axial momentum theory and subsequently following equations used for having final results [9].
Results and Discussion Optimal aerodynamic efficiency of various wind turbines calculated by CFD solver is plotted in fig.8.

Numerical simulation of pipeline flow field was performed with CFD method and the factors of erosion thinning were analyzed.
Numerical simulation is widely used considering complexity of erosion mechanism and high cost in experiments.
Numerical simulation is the controlled computational experiment which allows various parameters to be studied separately under various conditions, which is of little difficulty, high efficiency and low cost with the development of CFD [4-6].
Therefore, numerical simulation is in agreement with the actual instances and testified to be reliable and effective.
Application and experimental validation of a computational fluid dynamics(CFD).

This paper analyzes the vortex induced vibration (VIV) phenomena of twin box bridge girders by means of 2D computational fluid dynamics (CFD) models.
The results obtained from the application of CFD to the structural bridge profile were validated by experimental results from wind tunnel tests.
The numerical simulations are performed with ANSYS Fluent code based on the finite volume method.
The large eddy simulation (LES) with a dynamic Smagorinsky subgrid scale model is employed in the computational process.
Computation of aerodynamic derivatives by various CFD techniques.

From the CFD’s final result, 3 blades with angle 300 was the best combination among the parameters involved.
Next, all of the 3D solid modeling can be exported to the CFD analysis software for the next tasks.
For this particular case the value of iteration used for the simulation was 100.
Examples of images of meshing on the related blades (a) CFD image on 3 blades (b) CFD image on 4 blades (d) CFD image on 6 blades (c) CFD image on 5 blades Fig. 4.
Examples of CFD analysis images for few numbers of blades and blade’s angles Fig. 4, shows images of the CFD’s results based on the related parameters which have been set earlier.