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Discusses how to making up air to balance indoor air, eliminate the traditional system defects, through in the hearth additional secondary air tuyere through using the CFD----fluent6.2 simulation software simulates the airflow organization of the kitchen exhaust system if making up air.
I choose different simulation model of secondary air tuyere area to simulate, respectively s = 0.05 m2, 0.06 m2, 0.10 m2, 0.14 m2.
Numerical simulation Simulation assumptions.
Numerical simulation.
Using The finite element method numerical simulation and SIMPLE algorithm for solving the discrete equations.

Numerical Simulation of Fluid Flow in a New High efficient Mixer Qing Wu, Yachen Zhang, Xuejun Liu, Baoan Han School of Material and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China Email: wuqing@th.btbu.edu.cn; allld2000@yahoo.com.cn ;xj007@yahoo.com;646333407@qq.com Keywords: high efficient mixer, spiral blade, rotating impellor, flow field, numerical simulation Abstract.
In order to determine proper structural parameters of the new high efficient mixer created by the author, the CFD software is applied to simulate numerically three dimensional incompressible turbulent fields for three static mixing units and the mixing unit with rotating impellor.
Numerical Simulation and Analysis Governing Equations Because the fluid flow is characterized with eddy and fluctuation, the turbulent kinetic energy transport model and Reynolds stress model are used to describe the flow state.
The simulation by fluent software is performed to obtain the velocity contour of rotating impellor following single-blade spiral blade (Fig.12) and that of impellor following three-blade spiral blade (Fig.13), which can show the flow state of fluids inside the impellor.
(3) Because of complexity of flow state in the mixer, in addition to simulation and analysis by fluent software for providing some theoretical basis, it is necessary to perform verification by experiments to optimize the structural parameters.

For instance, complex CFD simulations are slow and can be computationally unstable so it may be impossible to use one directly inside of a large optimization where it would need to be executed thousands of times.
However the important point is that whether the model is a surrogate or a CFD simulation , the same optimizers and probabilistic analysis tools developed based on MDF will still be applicable.
Provides a Driver with model input values for each simulation.
Records model outputs from each simulation a Driver runs.
Data structure describing the inputs and outputs for a given simulation.

The Diesel-RK commercial software carried out the simulation the engine was chosen.
Rashid, “CFD Simulation Analysis of Sub-Component in Municipal Solid Waste Gasification Using Plasma Downdraft Technique,” CFD Lett., vol. 14, no. 8, pp. 63–70, 2022
Mirsalim, “Analysis the effect of advanced injection strategies on engine performance and pollutant emissions in a heavy duty DI-diesel engine by CFD modeling,” Int.
Mahkamov, “Multi-zone diesel fuel spray combustion model for the simulation of a diesel engine running on biofuel,” Proc.
Bekdemir, “Understanding the role of low reactivity fuel stratification in a dual fuel RCCI engine – A simulation study,” Appl.

a E-mail: mqpan@scut.edu.cn Keywords: Velocity distribution, Bifurcation structure, Microchannel array, Numerical simulation Abstract.
Simulation result indicated that the velocity distribution appeared to be double W-shape, and somewhat symmetrical.
The simulation analysis was restricted to single-phase laminar flow and the fluid was assumed to be a continuum.
The water liquid under 300K with the values 998.2 kg·m-3 and 1.003×10-3 kg·m-1·s-1 for density and kinetic viscosity was used for simulation.
According to the simulation results, the velocity values changed largely when RL was equal to 0.4.

Fig.1 The sketch map of Two-dimensional Fig 2 Finite element model o Finite element method ANSYS－FLOTRAN CFD is an advanced tool used to analyze the two and three dimensional flowing fields, and to solve the problem of nature convection[3,4].
Conclusions The distributions of the stream field and the temperature field caused by the point heat source within two-dimensional enclosure of small size, in different tilt states, are obtained by using the finite element method and the software of ANSYS－FLOTRAN CFD.
[4] Guoqiang Wang, Numerical simulation and practice on ANSYS [M], Xi’an: Northwest Industry University Press, 1999.221.

For that purpose, a numerical simulation approach is adopted.
In recent numerical simulations.
The geometry dimensions studied Name of geometry The wavelength The wave amplitude First geometry ‹‹ W1 ›› λ = 0.076 A = 0.00375 Second geometry ‹‹ WR1 ›› λ'= 0.0152 A’ = 0.00152 Mathematical Model The numerical simulations were performed using the commercial CFD codes ANSYS CFX (releases 14), and ANSYS Fluent (release 14).
The computational mesh was constructed using ICEM CFD (release 14).
Direct numerical simulation of a fully developed turbulent flow over a wavy wall, Theor.

For further analysis this mesh can either be used for Computational Fluid Dynamics (CFD) simulations using the code Eilmer [8] or converted to the foam format using e3prepToFoam [9] for simulation with OpenFOAM or other solvers.
Being directly coupled to mesh generation this tool is also an excellent basis for large scale optimization, as it allows parameterized geometries to be meshed automatically, ready for high fidelity CFD simulations.

Previous studies on the Winding Coils Temperature Since the thermal model is an essential when designing a generator, many researchers conducted their studies either using Computational Fluid Dynamics (CFD) method or Lumped Parameter technique.
For example, a CFD analysis to study stators and magnets temperature for steady-state condition only consider fixed inlet water temperature and did not include a room temperature in the analysis [7].
Ruuskanen, "Lumped-parameter-based thermal analysis of a doubly radial forced-air-cooled direct-driven permanent magnet wind generator," Mathematics and Computers in Simulation, vol. 90, pp. 218-229, 4// 2013

This approach is to firstly obtain unsteady surface pressure distribution by computational fluid dynamics (CFD), and then compute far/near field sound distribution by solving FW-H equation or by the Kirchhoff method.
These phenomena can be better described by unsteady simulation methods such as detached eddy simulation (DES).
The grid used in the simulation is generated using the commercial software ICEMCFD.
Detached eddy simulation (DES) is used in the current work.
The simulations show that DES yields good results agreeing with the experiment.