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The numerical simulation was carried out with CFD and the equation of Helmholtz resonator.
Methodology followed in the acoustic simulation with CFD and the Helmholtz model 1.
The acoustic simulation is a process in which CFD and sound propagation are coupled.
The acoustic simulation is in the frequency domain, while the transient CFD analysis is in the time domain.
Acoustic model in CFD.

The problem is solved by mathematical CFD solver ANSYS Fluent.
When solving fluid flow CFD method, it is important to define the area.
We start from the basic equations agents of the dynamic forces (3) where each matrix of mass M, damping B and stiffness K will be determined using by CFD simulations.
It was described problems creating of CFD model for fluid flow in the annulus.
Papadopoulos, CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant

A Numerical study of the Fire-extinguishing Performance of Ultrafine Water Mist in Small Scale Tunnel Space Tianshui Liang1,2,3, Jingjing Yu1, Guanpeng Lu1, Xiang Li1, Wei Zhong1,a and Siuming Lo3 1School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China 2State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China 3Department of Building and Construction, City University of Hong Kong, Kowloon, Hong Kong, SAR China azhongwei@zzu.edu.cn Keywords: Ultrafine Water Mist; Flow behavior; Fire extinction; CFD Abstract: CFD simulation study on the fire-extinguishing performance of ultra-fine water mist (UFM) and its flow behavior in a small scale tunnel.
Numerical simulation In the numerical simulation, the k–ε turbulence model was adopted to simulate thermal plume and the air flow.
Two kinds of fire size were considered in the simulations.
Fig.1 Layout of a small scale tunnel test scenario Simulation results and anlysis Without fire Fig.2 shows the time-variation of mass fraction of ultra-fine water mist in simulation of using Dense Gas model without obstruction in the tunnel.
Fig.4a: Without fire Fig.4b: With a small size of fire Fig.4c: With a large size of fire Fig.4 The isosurface of mass fraction (the value is 0.2 and 0.1) in small scale tunnel using density gas model (simulation results at 37s) Conclusion CFD simulation results on flow behavior of ultra-fine water mist were presented in this section.

CFD analysis is carried as per the standard analysis method using ANSYS FLUENT.
Body temperature is taken as output from CFD analysis.
Average of the heat transfer coefficient calculated is found matching with values taken from AVL simulation.
Grid Independent Test One of the essential aspects of CFD simulation study is to check the grid sensitivity.
Four cases were considered for CFD and thermomechanical study.

In recent years, the rapid development of commercial CFD software and is widely used in various fields, this paper CFD software is used to simulate the nozzle flow channel, analyze the distribution of pressure field and the flow field inside the nozzle, which provides related gist and technical means to optimize the nozzle structure parameters.
With the development of computer hardware and turbulence theory, there are many problems in CFD research introduces large-eddy simulation to conduct advanced turbulent numerical simulation.
Simulation Results and analysis.
Numerical simulation analysis inside the nozzle gas flow field is implemented by using CFD software, which obtains the distribution of total pressure, velocity and dynamic and static pressure inside the nozzle gas flow field, and that shows in Figure 3.
Summary The numerical simulation for air-assisted spray nozzle inside flow channel by using CFD software can visually understand and grasp the distribution of the gas flow field inside the nozzle, which can provide a reference for the design of three-dimensional flow calculation, and the simulation calculation can provides a new technical tool to optimize structure of the nozzle and the whole atomization equipment.

In the CFD(computational fluid dynamics) study of hydrocyclones, the grid is a important factor to predicting the flow field.
The CFD study of the axial, radial and tangential velocity profiles have been carried out.
Nowakowski has Simulated hydrocyclones by CFD to make clear whether it is a realizable option or still a research challenge [2].
Two commercial CFD software of Fluent and CFX were used to simulate the hydrocyclone and get the Prediction of strongly swirling flow within an axial hydrocyclone [4].
The CFD simulation and experimental validation studies on hydrocyclone were carried out at the same time and got the conclusion that predictions using RSM model were found better in agreement with experimental results with a marginal error between 4% and 8% [5].

Through CFD simulation experiment, the optimal structure of inner and outer tube differential pressure flowmeter prototype.Through the analysis of the experimental data, comparison of the classical theoretical models found high Chishlom prediction model error is minimum.Moisture the modified model, the relative error of measurement is better than in the range of experiment 5%.
CFD numerical simulation Computational fluid dynamics is based on the classical fluid mechanics and numerical calculation method,numerical simulation and image display, numerical solution of the flow field, so as to achieve the purpose of physical problems.1 road, 2road, 3road and 4 road differential pressure are correspond with 5 and 6, 7 and 8, 6 and 8 also 5 and 7.
Because the data cloud is more, give four kinds of throttling ratio speed of simulation results 1m/s[7,8].
Differential pressure flowmeter moisture experiment under the condition of low pressure pipe The inner and outer tube differential pressure flowmeter for moisture measurement, based on the four differential data analysis, and the results agree with CFD simulation.For existing moisture classical model, Chishlomoverreading model to predict the overall error is small, so the theoretical model on the basis of Chishlom research and correction, to get high precision moisture theoretical model.The actual situation inside and outside the tube differential pressure flow meter installed in the pipe shown in Fig. 6, the experimental data acquisition platform as shown in Fig. 7.
Flow Measurement Guidance Note No. 20 – CFD Tehniques Applied to Differential Pressure Flowmeter Performance, 1999.

E-mail: sunshir@163.com zhoujinmin@163.com Keywords: high temperature heat pipe heat exchanger (high temperature-HPHE), heat transfer enhancement, CFD, temperature distribution, vapor temperature.
Comparison and Analysis of Numerical Results With Experiment results Comparison Analysis of Cold And Hot Flow Temperature Field Fig.3 shows that the hot flow and cold flow outlet temperature obtained by CFD numerical simulation calculation with known inlet temperature conditions for hot flow and cold flow.
The analysis results indicate that CFD heat analysis computation software can predict the temperature distributions of a HPHE in a reasonable and accurate manner.
So the numerical results satisfy the actual engineering requirement, thus further providing the reliability of CFD software’s credibility.
At first, a numerical calculation modeling was established on the basis of the heat transfer characteristics of HPHE, and the novel CFD calculation software was used to perform simulation calculation on physical HPHE, the calculation results well agreed with experiment results, further providing the reliability of this simulation software, on this basis, simulation study was perform with this software on local heat transfer for ordinary-HPHE, enhanced-HPHE 1 and 2, and the simulation results have well predicted the optimum structure of enhanced heat transfer elements, thus providing a reliable basis for widening the temperature application range for HPHE and for safe linking HPHE in different temperature zones.

Commercial CFD code of Ansys Fluent 14 was used.
Simulations were carried out with time step of 5e-4s.
The simulation parameters used for the CFD simulation of the 2D fluidized bed are shown in Table 1.
Parameters used for simulation Results and Discussions Validation of the Model.
To validate whether the CFD results are self-governing from the mesh size, the simulations were performed using 3 type of mesh are coarse (55 x 448), medium (78 x 626) and fine (98 x 783) grids.

Simulation results have shown that the cavitation may occur on the lower portion of impeller suction side.
Thus, CFD has been an effective tool in studies on the internal flow in pumps.
OpenFOAM is an object-oriented C++ library of classes and routines of use for writing CFD codes.
It has a set of basic features similar to any commercial CFD solver, such as turbulence models and discretization schemes.
It is increasingly being used in the numerical simulation of hydraulic machinery.