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Simulation Study of a Porous Overflow-Pipe (POP) Type Hydrocyclone Xuefeng Zhao1,a, Limin He1,b, Lixin Zhao2,c, Sheng Zhong2,d, Yang Wang2,e 1China University of Petroleum, Qingdao 266555, China 2Northeast Petroleum University, Daqing 163318, China azhaoxuefeng@petrochina.com.cn, bhelimin@upc.edu.cn, clx_zhao@126.com, dzhongsheng_dqnepu@yahoo.com.cn, ewangyang_nepu_dq@163.com Keywords: porous overflow pipe; hydrocyclone; numerical simulation; structure analysis Abstract.
Based on computational fluid dynamics (CFD) method, applying FLUENT software, taking a de-oil hydrocyclone as an original structure, the effect of porous overflow pipe on the performance and pressure characteristics is analyzed.
Structure Parameters Simulation Effect of Overflow-pipe Diameter Du1.
The simulation of the POP hydrocyclone is compared with that of the traditional hydrocyclone.
By comparing the numerical simulation results of hydrocyclones, oil concentration of the POP hydrocyclone overflow is increased, which is beneficial for the upward movement of oil phase.

,Ltd, Jincheng, China, 048102 awangweishu@ncwu.edu.cn bljbaihe@163.com Keywords: supercritical pressure W-flame boiler; NOx emission; coal combustion; numerical simulation Abstract.
In this paper, software CFD is used to numerically study the generation rules of NO under different conditions in supercritical W-flame boiler, the influence of pulverized coal concentration and primary air velocity to the generation of NO is analyzed, so that the NO emission at furnace exit can be decreased and references can be provided for the field operation of boiler unit.
Simulation results and analysis The influence of pulverized coal concentration to the release characteristics of NO.
(a) (b) Fig.4 (a)NO concentration distribution at furnace exit when the velocity ratio with the basic condition is 0.9 (b)Average NO concentration distribution of different velocity ratios at furnace exit Conclusion In light of a 600MW supercritical W-flame boiler, software CFD is used to numerically study the generation of NO in the furnace with different coal concentrations and different primary air velocity, the following conclusions can be obtained: ⑴ The generation of NO mainly occurs at a distance of 2m-4m from the primary air vents in the early stage of coal combustion, then the concentration of NO decreases gradually, because of the oxidation of nitrogen in coke, the concentration of NO increases a little at the nose of the furnace. ⑵ The discharge amount of NO at furnace exit can be effectively reduced by increasing coal concentration.

(a) (b) Figure 2 – (a) House with a window model; (b) House dimensions The temperature distribution in these models was obtained in a transient state, using the CFD package ANSYS® Fluent.
Model simulations 2.3.1.
Numerical Procedure Numerical simulations were performed using the commercial CFD package Ansys® Academic Research Fluent, Release 20.1.
In Meshing, the option CFD in physics preference was chosen and for the first model, the mesh was generated by selecting the option to generate the mesh.
Simulations of Model 1 3.1.1.

Fig.1 Residential quarter plan in baidu map Fig.2 Target buildings in simulation Building indoor environment and outdoor environment is inseparable, should be a system, outdoor environment will have a direct impact on the indoor environment, simulation should be from the outside to the indoor, the simulation results of outdoor should become boundary conditions of indoor simulation, so this simulation in three steps, As shown in figure 3.
The first step is wind simulation of large-scale environment, the goal is to get building surface wind pressure and provide boundary conditions for the next step simulation; the second step is wind simulation of medium-sized environment, namely floor wind environment simulation, its purpose is to examines the whole floor roughly wind environment conditions; the third step is microenvironment simulation, Its purpose is examination room internal interior wind environment, thus the wind environment for the entire buildings are optimized.
Fig.5 is the floor simulation model, and floor is modeled by actual size.
Results and analysis of floor wind environment simulation Simulated calculation values of outdoor selected as boundary conditions in floor wind environment simulation.
But this simulation is in a limit state that means all windows and doors in open cases.

Development of a 3d Computer Simulation Model Using C++ Methods PASTERNAK Viktoriya1,a*, RUBAN Artem2,b , SHVEDUN Viktoriia2,с, VERETENNIKOVA Julia3,d 1Lesya Ukrainka Volyn National University, 9 Potapova Str., Lutsk 43025, Ukraine 2National University of Civil Defence of Ukraine, 94 Chernishevska str., Kharkiv 61023, Ukraine 3O.M.
The work teams [44] combine the CFD-DEM model to model dry round balls.
The prospect of further research is the development of a 3D computer model for modelling non-isometric shapes of particles, as well as the study of their main properties during filling simulation.
Padding, Multiscale modelling of wall-to-bed heat transfer in fixed beds with non-spherical pellets: from particle-resolved CFD to pseudo-homogenous models, Chemical Engineering Science 236 (2021) 1-15
Benassi, Coupled CFD-DEM model for dry powder inhalers simulation: Validation and sensitivity analysis for the main model parameters, Powder Technology 385 (2021) 199-226

Simulations and experiments test the method of measuring flowrate by measuring the rotation frequency of ball is feasible.
Impeller of swirl generator Because of the symmetrical configuration of the swirlmeter, the field of fluid of 3-Dimensional simulation in CFD software FLUENT is half of the measuring pipe.
Altering the design parameters of impeller, all simulation values are listed in table 1.
(c) The simulation error which the simulation methods are out of accord with the fluid state in pipe.
Analyzing the data of simulations and experiments, the maximal errors of meter coefficient is 7.8%.

Numerical Simulation Method The geometric dimensions of the compressor studied in this paper are shown in table 1, Numerical calculation relies on NUMECA software.
This paper carries on simulation study on the other four parameters.
Similarly, the results of simulation study show that parameters "d","e","f" have less effect on the performance of compressor.
Large-eddy simulation of the flow in a low speed centrifugal compressor.
Comparison of turbulence methods in CFD analysis of compressible flows in radial turbo machines.

Numerical Simulation Research for the Optimization of the Wet Flue Gas Desulfurization Tower Shunli Fang a, Yiqing Du b, Suyi Huang, Wuqi Wen and Yi Liu State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, China afshunli@gmail.com, byeeqing@hotmail.com Keywords: wet flue sintering gas desulfurization tower numerical simulation optimization Abstract.
Math and physical model Because we mainly focus on the study of the flow field, we use air instead of the smoke in the simulation.
Gao, Numerical simulation on resistance characteristic of large scale wet flue gas desulphurization spraying scrubber , Proceedings of the CSEE, 2008, 28(5): 28-33
Zhong, Numerical simulation of flow field in an empty spray column used for wet flue gas desulfuration, Energy research and utilization, 2003, 02: 10-12
David: Turbulence Modeling for CFD (DSW Industries, Californaia 1994)

Computation of Aerial Towed Cable Aerodynamic Performances with Large Eddy Simulation Wei Han, Xiao Wei Kanga, Yun Liang Wang, Xiao Hong Zheng Naval Aeronautical and Astronautical University, Yantai 264001, China aemail: kang1021980@126.com Keyword: Aerial towed system, Aerodynamic performance, Large eddy simulation Abstract.
Nowadays, there are three methods which can simulates the turbulence such as DNS (Direct Numerical Simulation), LES (Large Eddy Simulation), and RANS (Reynolds- Averaged Navier-Stokes).
Xu: Hydraulic Resistance Analysis in Towed Wire Rope Modeling, Computer Simulation, Vol. 28 (2011) No.1, p.123 (In Chinese) [8] F.
Wang: Dynamical simulation of towed and tethered cable systems, Ocean Technology, Vol. 24 (2005) No.2, p.69 (In Chinese) [10] J.
Huang: Ansys-CFD Analysis on the Flow Field of Helical Strakes around Riser, Ship & Ocean Engineering, Vol.39 (2010) No.4, p.151 (In Chinese)

In application of Computational Fluid Dynamics (CFD), dynamic and kinetic fields of two-phase flow in two equipments are researched.
Fig.3 3D graph of main fan diffuser of non baffle Fig.4 3D graph of main fan diffuser of incomplete closed baffles Numerical Simulation and Results Analysis Numerical Simulation and Results Analysis of Air-Phrase in Equipment Two physics models of two types of dust-controlling equipment are constructed and meshed by virtue of Gambit3.23.
Numerical simulations of two types of dust-controlling equipment are investigated by FLUENT6.3.
numerical simulations of two types of dust-controlling equipment are investigated.
The results of numerical simulation are shown in Table3.