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To analyze the flow field in the valve, numerical simulations are also performed in the paper.
Fig.2 Model of Flow Domain in the Vent Valve In order to study the flowing situation, the commercial computational fluid dynamics (CFD) software FLUENT is introduced into this paper.
To improve the precision of the computation, the RNG k-εviscous model is introduced into the simulation.
Numerical simulation is conducted by using the CFD software FLUENT, and the field parameters such as pressure and velocity are studied thoroughly which will do great help to the research of the vent valve.
Dynamic simulation of 3D flow field of train damper.

Numerical Simulation of Two Dimensional Laminar Wall Jet Flow over Solid Obstacle.
Simulations were carried out for different Reynolds numbers.
Kanna and Das [7] carried out theoretical simulation of plane laminar wall jets over a backward facing step.
The present study aims to predict the flow pattern around a solid block under wall jet through the development and validation of an in-house CFD code.
An in-house CFD code was developed and validated with a published result.

Muncii Boulevard, Technica University of Cluj-Napoca, Manufacturing Engineering Department, Cluj-Napoca, Romania anicolae.panc@tcm.utcluj.ro, bnicolae.balc@tcm.utcluj.ro, calina.luca@tcm.utcluj.ro Keywords: CFD simulation, die casting, heat transfer, investment casting Abstract.
For the numerical simulation of the casting process, several mathematical models have been developed and applied widely in the past years.
Filling up with liquid metal Considering that the liquid metal for casting is a viscous fluid, in the simulation stage occur a series of more complex problems in describing physical phenomena that accompany the flow process and filler a mold.
This is as it says [9],[10] a cell-centered finite volume methods, typical of most commercial CFD tools (Computational Fluid Dynamic tools), are computationally efficient, but can lead to convergence problems on meshes that feature cells with highly non-orthogonal shapes.
a) b) Fig. 3 Simulations results a) for flowing, b) for heat transfer The results of Comsol simulation for liquid metal flow in mold and cooling mold, it is presented in table 2.

The study on this technique was conducted by Ruitao Peng et al.[13], who evaluated the effectiveness of these internal micro-channel structures in the turning tool using computational fluid dynamics (CFD) simulations[24].
Design and performance of an internal cooling turning tool with micro-channel structures Ruitao Peng, Haojian Jiang, Xinzi Tang, Xiaofang Huang, Ying Xu, Yunbo Hu A novel turning tool, designed with 2mm micro-channels using CFD simulations, demonstrated improved heat transfer efficiency, reducing cutting forces and temperatures compared to traditional flood cooling methods[13]. 2.
Biermann, “Experimental studies and CFD simulation of the internal cooling conditions when drilling Inconel 718,” Int J Mach Tools Manuf, 2016, doi: 10.1016/j.ijmachtools.2016.06.003
Li et al., “Design of an internally cooled turning tool based on topology optimization and CFD simulation,” The International Journal of Advanced Manufacturing Technology, 2017, doi: 10.1007/s00170-016-9804-9
Yeo, “A computational fluid dynamics (CFD) model for effective coolant application in deep hole gundrilling,” Int J Mach Tools Manuf, vol. 113, pp. 10–18, Feb. 2017, doi: 10.1016/J.IJMACHTOOLS.2016.11.008

The results of numerical simulation were confirmed by fixed sampling method of immersed tube in goaf.
The Brief Introduction of Fluent Fluent is a kind of CFD software, it has powerful functions and can widely suitable for engineering calculation.
Fluent is the CFD Software Package which has the largest accompany in market, it can use for simulating the comprehensive flow range from incompressible to compressible height.
Considering the effect of the released gas in goaf and simulation establish easily, the No.304 goaf caving zone is set to be gas release area.
Non-equivalent caving goaf three zones study and simulation verification[J].Chinese journal of safety science,2010,20(10):37-40.

Numerical Simulation of the Viscous Flow for the Supersonic Jet Element Yong Xu1, a, Guoqing Zhang1, b and Fei Wang2,c 1School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China 2 School of Mechanical & Electronic Engineering, Beijing Institute of Technology, Beijing, 100081, China axyxuyong@bit.edu.cn, bzhangguoqing@bit.edu.cn, cwfphd@126.com Keywords: Supersonic Jet Element; Numerical Simulation; Viscous Flow; Switching Time.
The viscous flow of the supersonic jet element was simulated numerically based on CFD technology, and many tests have been done to verify the numerical precision.
So the numerical simulation of the viscous flow for the supersonic jet element is accurate and reliable, and it can be applied to investigate the steady flow and unsteady flow in supersonic jet element.
Numerical Simulation Method Fig.2 The solid scheme of the SJE Fig.3 The surface grids of the SJE Fig.2 has shown the solid scheme of the SJE, and Fig.3 has shown the surface girds of the SJE.
So the numerical simulation of the viscous flow for the supersonic jet element is accurate and reliable, and it can be applied to investigate the steady flow and unsteady flow in supersonic jet element.

Study on the Sand/Dust Inject Approach in Sand/Dust Test System Hongwei Li 1, a, Hongyan Li 2,b, Ying Dong1, a, Haibo Han1, a, Li Niu1, a 1Baicheng Ordnance Test Center, Baicheng, China 137001 2Heilongjiang College of Construction, Harbin, China 150028 alhw467@sohu.com, blihongyan2003@sohu.com Keywords: Hydromechanics; gas/solid two-phase flow; CFD; environmental test Abstract.
In order to obtain the anticipated sand/dust concentration and uniformity in the test segment, numerical simulation methods are adopted to study the characters of different sand/dust inject approaches.
The numerical simulation results applied in the optimal design of particles inject system in some large sand/dust test system get a favorable progress.
All these factors coincide with the discrete phase model’s characters of the Fluent, so discrete phase model is adopted in this simulation.
Numerical Simulation and Experiment Study on Efficiency of Inertia Separator.

The BEM theory, the wind tunnel experiment, the field experiment and the CFD simulation are the major methods to study wind turbine[2,3].
Among these methods, CFD simulations can provide valuable quantitative insight into the aerodynamic behavior in a cheap and efficient way, and have been more and more extensively applied to investigate flows aroud wind turbine . .
Large-eddy simulation (LES) was developed as an intermediate approach between direct numerical simulation (DNS) in which the Navier-Stokes equations are directly solved and RANS.
LES Simulation Mathematical Model.
In our simulations is set 0.1.

In the initial stage of the simulation, Computational Fluid Dynamics (CFD) analysis was commenced with the fluid modeling within a tank with a diameter of 62 m and a height of 28.7 m.
Ax=A×Sin2×π×tT (Eq. 9) Following the determination of the input for the CFD analysis, the process proceeded to the solving stage with a total of 60 time steps and a time increment of 0.1s.
Following the determination of the input for the CFD analysis, the process proceeded to the solving stage with a total of 60-time steps and a time increment of 0.1s.
This simulation utilizes the imported load feature to retrieve pressure data from the CFD simulation results.
Jäger, “Fuel Tank Sloshing Simulation Using the Finite Volume Method,” Graz, Austria, 2019

Governing equations, turbulence and sound models Applying fluid dynamic CFD package Fluent™ Fluent Inc, this paper simulated the channel flow using superhydrophobic surfaces in 2D and unsteady state.
Based on transient flow simulation results (LES modeling is highly recommended for capturing wide band sound spectrum), time variation of acoustic pressure is calculated with the formulation of Lighthill's Acoustic Analogy.
Simulation results and analysis Receiver 1 and receiver 2 were two sensors which measured the sound pressure generated by superhydrophobic surface and plane surface respectively.
Since the distance of the two sensors were very close to their maching surface and the simulation was under 2d model, the absolute value of the sound pressure at that two point were very hign.
An analysis of superhydrophobic turbulent drag reduction mechanisms using direct numerical simulation [J].