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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.

Numerical Study on the Flow Structure of a Steam-jet Vacuum Pump at Different Throat Length Dai Xiao- Chun Liaoning University Of Technology, Liaoning Jinzhou 121001, China emai: dxiaoch@163.com Keywords: steam-jet pump, flow structure, throat length, CFD simulation Abstract.
The aim of the study is to reveal the complication of the flow process of a steam-jet by using the simulation software package (FLUENT).
Steam-jet pump model In this study, CFD was used to analyze the flow phenomena inside a steam-jet pump.
The CFD simulation was used to visualize the change in the flow structure and mixing process inside the steam-jet vacuum pump as influenced by throat length.
(2) where: : including the effect of body force and energy source : density , , : velocity component : energy of flow rate : pressure : stress tensor : heat-source CFD model and Numerical Simulations According to others researches, the CFD method was a good research tool to investigate and predict the complicated flow in a steam-jet vacuum pump [4-6].

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.

Viscous flows around NASA CRM wing-body-tail configuration were simulated by an in-house CFD solver called Exstream.
Common challenges are complex flow simulation (such as pressure gradients, laminar/turbulent transition regions, separated and possible unsteady flow) by Computational Fluid Dynamics (CFD) and mesh generation for topologically complex configurations by grid methods (e.g., Refs. [1, 2]).
As mentioned earlier, AUSMDV, k-ω SST turbulence model and LU-SGS have been used for this simulation.
Summary Viscous flows around NASA CRM wing-body-tail configuration has been simulated by an in-house CFD solver called Exstream.
Summary of the First AIAA CFD High-Lift Prediction Workshop.

CFD simulation has been verified using available experimental results.
However, the application of CFD models is on a case by case basis.
There is no universal CFD model that can be used in all the different cases [13].
Simulations of a ship’s propeller wash.
CFD calculation and experimental validation of a Kamewa high-skew marine propeller.

The results showed that macro-mixing scale-up model agreed well with CFD simulations but the micro-mixing scale-up model had a less precision compared with that of macro-mixing model.
All the simulations in this work used same boundary conditions.
The details of cases and the length needed to reach 98% mixing both gotten from the scale-up equations and from the CFD simulations were demonstrated in table 1.
Table 1 Comparison of CFD Simulation and Scale-up Equation results under different conditions Cases index d/D uj/um Macro-mixing Micro-mixing L/d (CFD) L/d (Eq） relative deviation（%） L/d (CFD) L/d (Eq) relative deviation (%) 1 1/6 2 74 81.66 9.38 66 88.59 25.50 2 1.5/6 3 39 39.087 0.22 35.33 34.72 -1.76 3 2/6 4 22 23.175 5.07 16 17.87 10.46 4 2.5/6 5 15 15.45 2.91 10.52 8.33 -26.30 5 3/6 6 12.37 11.09 -11.54 9.12 7 -30.29 Conclusions In this paper we investigated the micro- and macro-mixing in the mixing section of ejectors.
The results showed that macro-mixing scale-up model agreed well with CFD simulations but the micro-mixing scale-up model had a less precision compared with that of macro-mixing model.

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].

According to the above reaction chamber structure, using computational fluid dynamics software CFD - ACE - GEOM to build two-dimensional model, after divide grids, as shown in Fig.1 (b).
The results of the simulation show in Fig.3.
These are all consistent with the results of the simulation.
(a) Deposition effect of reaction intraluminal (b) The coordinates of deposition effect Fig.2 Figures of simulation results (a) When the power is 40W (b) When the power is 50W (c) When the power is 60W Fig.3 Graphs of deposition rate when power changes All of the above mainly through the computational fluid dynamics(CFD) simulation software to simulate the influence of deposition parameters on the deposition rate.
Conclusions This paper uses the software CFD-ACE + to study the deposition rate and the uniformity of the thin film under different power.

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.

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.