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The application of CFD to complex problems has a big importance in providing engineering solutions no mattering the size of project.
The advance in the power of computer processing allows that complex equations associated with CFD can be solved in lower timescales.
Simulations were done in two stages.
The maximum simulation time was 20 seconds with a time step of 0,01s.
The simulation occurred for around 2 hours and 20 minutes for the Case 1 and around 22 hours for Case 2.

Using ANSYS program, the finite element simulation based on thermoelectric coupling is conducted by a series of procedures, such as three-dimensional model building of airflow level posture sensor according to the actual size of the proportion, network modifying, loads applying and equation solving.
The numerical results show that compared with two-dimensional modeling, the simulation result of three-dimensional modeling and thermoelectric analysis methods are more comprehensive and accurate, which provides more reliable basis for practical research of the airflow level posture sensor.
Selection of analyzing types: the choice of FLOTRAN CFD analysis capabilities of ANSYS software. 1) Definition of unit types: choice is FLUID142 unit with shape of four nodes.
Observing temperature and flow field distribution in closed chamber requires the use of section observation function of ANSYS-FLOTRAN CFD software, through the translation of coordinates inside the cavity observe corresponding temperature field and velocity vector field.
[3] Guoqiang.Wang, “Numerical simulation and practice on ANSYS,” [M].

All simulations were carried out using the Ansys CFX ® commercial code.
The CFD numerical package was used for the present calculations.
For the simulation, time was optimized, and the time steps were modified during the simulation.
Hydrodynamcs of Oil-Water with Leakage by CFD.
Sarmento, Multiphase Flow on Curved Conections Coupled to Pipe With Leaks: Modeling and Simulation.

The simulation results are in good agreement with experimental results.
With the development of CFD software, more and more CFD software are utilized to optimized the design of SCR system[3-8].
In this paper, CFD modeling is used to numerically simulate the flow field and NH3 distribution of 100MW coal-fired power station.
NH3 concentration distribution of first catalyst bed inlet Comparison Between CFD and Test Results Cold experimental results are shown as tab.1 and tab.2.
Simulation results and experimental results are in good agreement.

Based on the simulation results, the measures to reduce NOX emissions can been token effectively [3].
This paper uses the extended Zeldovich theory, based on the CFD software STAR-CD to simulate and calculate the temperature and NOX formation rule of the CNG direct-injection engine in different crank angle.
The domain of the CNG engine working process simulation in the calculation includes intake and exhaust port and combustion chamber.
At the begin of the simulation, the intake inlet temperature is 300K, the relative pressure is 90kPa, and exhaust port temperature is 500K.
Figure2 shows the comparison of the experimental values and simulation values of cylinder pressure.

alguiot@edu.unisinos.br, bfzinani@unisinos.br, cprwander@unisinos.br Keywords: Covid-19, Contagion, Ventilation, Exposure, CFD.
Computational Fluid Dynamics (CFD) is used for this purpose.
Computational fluid dynamics (CFD) is the solution, by numerical methods, of the differential equations of transport phenomena.
Figure 4 - 2D and 3D system design for computer simulation (Author, 2022).
Biswas, A novel CFD analysis to minimize the spread of COVID-19 virus in hospital isolation room, Chaos.

Many researchers have used computational fluid dynamics (CFD) software to solve problems which can not be solved theoretically and experimentally, for example, the simulation for the flow velocity field inside and outside the AWJ nozzle has been carried out [2].
This study aims to obtain the flow field of the AWJ by simulation methods in help of CFD software-FLUENT 6.0, the velocity field of the AWJ is also obtained.
Simulation Equation The multi-phase Euler model is used as the simulation equation [8].
Simulation Model and Result The simulation model is built by the dimension and shape of the AWJ nozzle in experiment.
Comparing with the simulation result, the Fig.6 is obtained, it indicates that the experiment value and simulation value change similarly, both value are almost the same, which proves that the simulation method is successful, the simulation model and boundary conditions are right.

Aiming at the lack of research for key parameters of the cage-type trim of sleeve-type steam trap, the numerical simulation calculation was carried out for the cavitation flow in valve, the influences of orifice types, orifice diameter, guide sleeve types on cavitation were researched.
Aiming at the cavitation problem and urgent localization need of ultra-supercritical steam trap, the CFD method was introduced [2-3].
Numerical Simulation Calculation Geometry Model and Mesh Generation.
Mesh model is generated by ICEM-CFD software, the body-fitted grid of flow area in trap is genetated by tetrahedral/hybrid mesh.
Fig.9 is the simulation result of the steam trap of double orifices type when the saturated vapor pressure is 4.8 MPa.

A Research on Separation mechanism of Cylindrical Hydrocyclone Xiaojiang Lu, Xiang Yang College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin，300222，China xiaojianglu@tust.edu.cn, xiangyang@tust.edu.cn Key Words：Cylindrical Hydrocyclone; separation; numerical simulation; geometric parameters.
Using the Fiber Quantity Analyzer (FQA) for analysis of the paper pulp fiber moving in the Cylindrical Hydrocyclone, making use of the way of Limited Element Analysis and Calculation Fluid Dynamic for the numerical simulation of the velocity distribution of moving process.
Experiment data and numerical simulation Experiment data .
Think that the wall can't permeate, the wall moving velocity is zero, making use of the square distance in function in wall to compute the wall shear stress, the kinetic energy of turbulent flow, the spreads rate of turbulent flow near wall etc.. 2)The mathematics model establishes To the incompressible Newtonian fluid, the cylindrical coordinate equation of three-dimensional flow can written as： （1） （2） （3） 3)CFD numerical simulation Combine above mathematics model with experiment data, the CFD method was used to simulate velocity distribution in hydrocyclon, results obtained show as figure 1, and the separation efficiency curve such as figure 2 show.
Simulation of non-Newtonian flow in a hydrocyclone [J].

Using ANSYS-FLOTRAN CFD software, the finite element simulation was conducted by a series of procedures, such as two-dimensional model building of fluidic gyro, meshing, loads applying and equation solving, we calculated the airflow distribution in sensitive chamber of fluidic gyro with different outlet apertures.
Fig. 1 Operation principle of fluidic gyro Solution of the Finite Element Method FLOTRAN CFD analysis capabilities in ANSYS is an advanced tool which is used to analyze two-dimensional and three-dimensional fluid flow distribution, and also can be used to simulate the movement of airflow in the sensitive chamber.
This simulation usually consists of three steps: modeling, applied load and calculation
(a) dc =1mm (b) dc =2mm (c) dc =3mm Fig. 3 Relative pressure distribution in the sensitive chamber with different outlet diameters Conclusions Using ANSYS-FLOTRAN CFD software, finite element simulation was conducted by a series of procedures, such as two-dimensional model building of fluidic gyro, meshing, applied loads and equation solving, we calculated the flow distribution in sensitive chamber of fluidic gyro with different outlet apertures.