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The water flow pattern in WMFS was simulated by using CFD software, and the data were analyzed in theory.
Simulation of the Water Flow in the WMFS In simulation, the WMFS was simplified as following as Fig. 3(a).
(a) (b) (c) (d) (e) Fig. 3 The simulation of water flow at 0.0275m/s of the upward water velocity: (a) the model of WMFS in simulation; (b) contours of velocity magnitude (m/s); (c) velocity vectors of water flow; (d) contours of Static Pressure (Pascal); (e) contours of density (Kg/m3) Coal Slime Separation Test According to exploratory experiments and simulation, the upward water velocity was selected at 0.275 m/s.
Coefficient. (%) Wt(F) (%) Ash (%) Wt (%) Wt(F) (%) Ash (%) Wt (%) Wt(F) (%) Ash (%) -1.3 44.54 4.74 75.70 35.10 4.76 15.50 8.31 5.43 19.15 1.3-1.4 14.37 16.66 15.48 7.18 17.47 17.23 9.24 18.47 56.29 1.4-1.5 9.57 27.38 5.93 2.75 28.00 10.61 5.69 28.84 67.42 1.5-1.6 5.56 38.95 1.43 0.66 39.64 8.18 4.39 39.64 86.90 1.6-1.8 6.32 52.30 1.46 0.68 64.79 11.00 5.90 51.57 89.70 +1.8 19.64 81.26 0 0 0 37.47 20.10 81.26 100.00 Total 100.00 28.55 100.00 46.37 9.48 100.00 53.63 46.45 Conclusions With the fast growth of computer techniques and advances in Computational Fluid Dynamics (CFD), the direct simulation of multiple phase phenomena in a solid-liquid fluidized-bed becomes feasible.
By comparing the simulation results with laboratory experimental data, it was shown that the use of CFD methodology has favorable accuracy and efficiency.

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.

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].

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.

Simulation results show that the change of cavity shape is lagging behind that of gas supply.
In this paper, CFD technology is used to investigate effect of ventilation rate on supercavitation under three typical gas-supply scenarios.
In this work, detached eddy simulation (DES) method is used as turbulence modeling.
The Physical Model and Boundary Conditions for Simulation The physical model and surface grids for simulation are shown in Fig.1.
The number of total grids used in the simulation is 1215580.

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.

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.

Simulation results allow to predict the optimum number of induced fractures.
Results A series of simulation studies were conducted to analyse the production performance of hydraulically fractured horizontal wells.
We define the dimensionless compressibility CFD which is: fres f xk wk CFD ⋅ ⋅ = kf : Fracture permeability.
When CFD = 300, the optimal number of fractures is10 and 8 will be recommended for CFD = 100.
Our simulations have shown that the optimal number of fractures is even smaller as the conductivity is lower.

Results of the simulation reveals that velocity has little effect on the flow field distribution.
In this research, with different inlet flow, the flow characteristics in cooling water jacket will be analysed based on CFD method for a better understanding of the effect mechanism for the cooling performance.
Results and discussions Based on the factors influencing the flow field, different conditions was adopted in the numerical simulation of internal flow in the engine cooling water jacket.
Two inlets were set in the simulations with one in the same side of the outlet and with the other in the opposite.
References [1]Ting Li: The Numerical Simulation on Steady-State Solid-Flow Coupled Head Transfer Problem in Engine Coupled System.