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Performance Enhancement of a Small Centrifugal Cooling Fan Sheam-Chyun Lina, Cheng-Ju Changb and Ming-Yuan Hsiehc Department of Mechanical Engineering National Taiwan University of Science and Technology 43, Sec. 4, Keelung Road, Taipei, Taiwan 10672, ROC asclynn@mail.ntust.edu.tw, bd9603301@mail.ntust.edu.tw, cd9403607@mail.ntust.edu.tw Keywords: Centrifugal fan, Aerodynamics, Acoustics, CFD simulation, AMCA chamber.
CFD and Experimental Schemes Numerical Scheme.
Advance to simulation the flow field in the centrifugal fan after getting the best combination.
The deviation between simulations and experiments were less than 10%.
The improved impeller performances on the B2 and B3 design are identified from both the CFD and experimental results. 2.

Based on previous CFD models [14].
Same boundary conditions were applied for the fluid domain in CFD and FSI simulation.
RESULTS OF FSI SIMULATION The deformation of the UA boundary obtained from the FSI simulations is shown in Figure 3 for both with and without MAS fitted.
Tu, Simulation of Pharyngeal Airway Interaction with Air Flow Using Low-Re Turbulence Model.
Modelling and Simulation in Engineering, 2011. 2011

Optimization design of rapid-cooling mixer of by-pass system of cement production based on CFD Mao Ya1, a,Fu Wei1, and Chen zuobing1, 1School of mechanical and electronic engineering, Wuhan University of technology, Wuhan, Hubei, China. 430070 amaoya@whut.edu.cn Keywords:Cement production, CFD, Flow field simulation, Optimization design Abstract.In the situation that energy is increasingly grim, how to use high-sulfur fuel effectively and reasonably is a big problem for high-energy consumption cement industry.
CFD method is used to simulate the flow field and temperature field inside mixer.
The simulation result help to guide and test the improvement of mixer structure design.
The simulation resultS of thermal flow field are as following figure(Fig. 3~6).
CFD method is used to simulate the flow field and temperature field inside mixer.

Used the FLUENT, a CFD software, a series of simulation experiments were done.
Since the numerical simulation which based on CFD don’t need practical prototype, cut down model, besides, it doesn’t have distribution and is security.
There are two key problems remain to be solved in the grid division in CFD simulate compute.
CFD Analysis of Escape Systems in High-speed Flow Field Based on the Chimera Technique[D].
Validation of CFD Methodology for Ejection Seat Applications[R].

In this panorama, the current academic-industrial trend is determining numerical (simulation) of constant “C” through a methodology which is based on Computational Fluid Dynamics (CFD) techniques, in order to remedy the experimental dependence on the calibration or operation of these flow meters.
In this article, numerical simulations are performed through the commercial code Fluent.
The experimental data and fluid dynamics simulation are shown in Fig. 2.
Characteristic Curve of Orifice Meter (CFD) and experimental data from [4].
Another important tool provided by CFD techniques consists of certain variable calculation along a given boundary.

Computational fluid dynamics (CFD) design and simulation of ascending and descending microchannels is used for cell separation.
Xuan et al. performed CFD simulation to study the phenomenon of a two-layer laminar flow in a curved microchannel to realize the transfer of mass and offer feasible methods of performance enhancement for the devices of micro fluidic [16].
CFD simulation was succesfully demonstrated for separation of 15 µm particles from the mixture with 100% efficiency in ascending curvilinear microchannel.
The process of simulation begins with creating 2D layout model, generating a mesh, and applied boundary conditions using CFD GEOM module.
Numerical studies were conducted with a commercial CFD package, CFD ACE+ and simplified model was developed.

Lawrence [4] simulated the flow field in the engine compartment of a sedan with CFD.
The simulation results were almost agreement with the experiments of prototype vehicles; it showed that CFD benefited the optimal design and achieving a better management of airflow and temperature in the beginning of development.
Results and Discussion First of all, the simulation of the flow field in the engine compartment of the prototype model was performed.
Then, 4 improved models illustrated in Table 1 were presented based on the simulation results of the prototype model.
From the CFD simulation results, the following conclusions are acquired. 1.

The velocity fields obtained are compared with CFD simulations of the flow and allow the rigorous validation of numerical models.
The results obtained are compared with CFD simulations of the flow and allow the rigorous validation of numerical models.
Results and discussion PIV measurements are compared to computational results predicted by 2D axisymmetric simulations of the flow [2, 10].
This difference can be explained by the fact that the CFD simulations use a 2D axisymmetric stationary model which is unable to predict the instabilities caused by the interaction between the two primary and secondary flows.
Therefore, the PIV technique proves to be a very interesting tool for the validation of CFD simulations in supersonic ejectors.

A numerical study using computational fluid dynamics (CFD) under air/water two-phase flow condition without thermal transmission is carried out utilizing the commercial CFD code CFX.
Hybrid meshes of tetrahedral and hexahedral volume elements were generated for CFD model.
CFD analysis Computation regions and boundary conditions.
Part 1: Computational fluid dynamics (CFD) simulations.
Kang, CFD analysis for full vessel upper plenum in Maanshan Nuclear Power Plant, Nucl.

In flow separation region, there is different between CFD and experimental data, the flow attachment points of simulation result is far behind of experiment data, and the separation bubble length is greater than the experimental data.
In table 1, it shows the separation point and attachment point comparison between CFD method, experimental data and simulation results in reference [7].
As can be seen from the figure, the separation point position based on CFD method is agreed well with experiment data for minor error of less than 2%, but for the attachment point, the CFD method excessively predict more than 20%.
Further exploring CFD-based gust response and gust alleviation.
CFD Validation of Turbulent Separation Control on a 2D Hump (NASA Langley Workshop Validation: Case 3), AIAA 2005-5013