Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: December 2010
Authors: Jiang Shao, Cheng Hui Zeng, Yong Hong Li
Experiences indicated that the most effective way for physics of failure applying in engineering practice is to be combined with simulation technology, thus to form reliability simulation analysis technique on physics of failure.
Reliability Simulation Analysis Technique on Physics of Failure Reliability simulation analysis on physics of failure is based on the reliability method on physics of failure.
The basic process of reliability simulation analysis technique on physics of failure is showed as Fig.1.
Fig.1 The basic process of reliability simulation analysis technique on physics of failure Analysis Example Digital Prototype Establishment A management processor is chosen as an example to conduct reliability simulation analysis.
The software FLOTHERM is utilized to conduct thermal analysis on the CFD digital prototype as Fig.3.
Reliability Simulation Analysis Technique on Physics of Failure Reliability simulation analysis on physics of failure is based on the reliability method on physics of failure.
The basic process of reliability simulation analysis technique on physics of failure is showed as Fig.1.
Fig.1 The basic process of reliability simulation analysis technique on physics of failure Analysis Example Digital Prototype Establishment A management processor is chosen as an example to conduct reliability simulation analysis.
The software FLOTHERM is utilized to conduct thermal analysis on the CFD digital prototype as Fig.3.
Online since: July 2016
Authors: Ben Thornber, Andre Nader, Asiful Islam
The original proposal of a Detached-Eddy Simulation (DES) initiated and inspired various hybrid turbulence modelling approaches, which seek to selectively treat regions of flow as either a Large-Eddy Simulation (LES) or a Reynolds-Averaged Navier-Stokes (RANS) [1, 2].
This was also used by previous investigations in work such as the development of open jet wind-tunnel boundary corrections, parametric studies analyzing the effects of ground simulation in wind-tunnels, experimental work validating CFD simulations and the investigation of dynamic yaw behaviour [3].
The time-step size was chosen based on the Courant-Friedrichs-Lewy (CFL) condition and all simulation results presented here used a CFL value of 0.8.
PIV results captured slightly higher velocities closer to the decklid compared to the CFD which provided better resolution in this region representing the interaction of the detached shear-layer and the recirculation in the wake.
Additionally, CFD results revealed a small region of lower velocity, similar to a subtle separation bubble midway along the backlight at the furthest longitudinal plane (y=-45).
This was also used by previous investigations in work such as the development of open jet wind-tunnel boundary corrections, parametric studies analyzing the effects of ground simulation in wind-tunnels, experimental work validating CFD simulations and the investigation of dynamic yaw behaviour [3].
The time-step size was chosen based on the Courant-Friedrichs-Lewy (CFL) condition and all simulation results presented here used a CFL value of 0.8.
PIV results captured slightly higher velocities closer to the decklid compared to the CFD which provided better resolution in this region representing the interaction of the detached shear-layer and the recirculation in the wake.
Additionally, CFD results revealed a small region of lower velocity, similar to a subtle separation bubble midway along the backlight at the furthest longitudinal plane (y=-45).
Online since: October 2014
Authors: Zhuo Huan Hu, Tian Ke Huang, Lu Lu Wang, Mo Yang, Ya Zhen Sun
Numerical simulation of flow around power transmission multi-bundled conductors has been carried out.
We start with a description of a weak formulation of incompressible Navier-Stokes Equations. 2.2 CFD solution method In this paper, a two-dimensional six parallel transmission lines of 30-mm-diameter as is shown in Fig.1 is selected for numerical modeling.
CFD grid distribution around the transmission lines For the transmission line in the environment of the surrounding air flows, The Reynolds number around the lines is greater than the critical threshold.
An economical approach to model flow, model was adopted for the simulation calculation in the Fluent [9].
This suggests that the distance between lines will reduce greatly in the strong wind. 3.The result shows that the CFD model is able to accurately predict the both velocity and drag force of the long crossing transmission line.
We start with a description of a weak formulation of incompressible Navier-Stokes Equations. 2.2 CFD solution method In this paper, a two-dimensional six parallel transmission lines of 30-mm-diameter as is shown in Fig.1 is selected for numerical modeling.
CFD grid distribution around the transmission lines For the transmission line in the environment of the surrounding air flows, The Reynolds number around the lines is greater than the critical threshold.
An economical approach to model flow, model was adopted for the simulation calculation in the Fluent [9].
This suggests that the distance between lines will reduce greatly in the strong wind. 3.The result shows that the CFD model is able to accurately predict the both velocity and drag force of the long crossing transmission line.
Online since: May 2010
Authors: Andreas Ludwig, Meng Huai Wu, Laszlo Könözsy, Wolfgang Schützenhöfer, Anton Ishmurzin, Robert Tanzer, Monika Grasser
The Eulerian-Eulerian model equations
have been implemented in the commercial Finite Volume Method based FLUENT-ANSYS v6.3
CFD software using User-Defined Functions (UDF).
This paper focuses on both the process and simulation parameters and their influence on the macrosegregation formation.
Results and discussion The solidification of a ternary steel ingot (X34Cr15) with a relatively small size (diameter: 66 mm, height: 170 mm) was set up for CFD simulations (see Table 1).
All properties and parameters used for the simulation are listed in Table 1.
The CFD simulations predict a chance of having smaller crystals flowing first downwards and then upwards.
This paper focuses on both the process and simulation parameters and their influence on the macrosegregation formation.
Results and discussion The solidification of a ternary steel ingot (X34Cr15) with a relatively small size (diameter: 66 mm, height: 170 mm) was set up for CFD simulations (see Table 1).
All properties and parameters used for the simulation are listed in Table 1.
The CFD simulations predict a chance of having smaller crystals flowing first downwards and then upwards.
Online since: February 2013
Authors: Zhen Hua Xie, Zheng Lan Yuan, Yu Zhang
Numerical Simulations and Analysis
Distribution Law of Blasting Fume.
In this simulation, arranges a distance of 5 meters.
This paper performs the simulation of CO diffusion process in blind roadway in Shachang mining area of Shou Yun iron mine, getting the actual completion time required to meet the safety standard by the application of CFD software Fluent.
The simulation results are in line with the theory and engineering practice.
CFD Simulation Study on Jet Ventilation Flow Field in Heading Face [J].
In this simulation, arranges a distance of 5 meters.
This paper performs the simulation of CO diffusion process in blind roadway in Shachang mining area of Shou Yun iron mine, getting the actual completion time required to meet the safety standard by the application of CFD software Fluent.
The simulation results are in line with the theory and engineering practice.
CFD Simulation Study on Jet Ventilation Flow Field in Heading Face [J].
Online since: October 2011
Authors: Song Ying Chen, Fu Chao Xie, Jun Jie Mao
China
achensy66@sdu.edu.cn, bxiefuchao2004@163.com.cn, ctfyt_123@163.com.cn
Keywords: Gasoline Blending; Numerical Simulation; Side-entering Agitators.
For the present, gasoline blending is mainly achieved by mechanical agitations especially side-entering agitators in the oil refinery, the mixing process of which could be able to predict by using modern technologies such as CFD.
Most of the CFD simulations focused on jet mixing or top entering mixers and less works have carried out on the performance of side-entering mixers.
A A Dakhel and M Rahimi [3] studied the homogenization time of two layers of crude oils in 19000 m³ floating roof storage tank using CFD, and the results showed good agreement with experiment data.
In summary, it can be said the numerical simulation of side-entering agitators have not been carried out in the process of gasoline blending.
For the present, gasoline blending is mainly achieved by mechanical agitations especially side-entering agitators in the oil refinery, the mixing process of which could be able to predict by using modern technologies such as CFD.
Most of the CFD simulations focused on jet mixing or top entering mixers and less works have carried out on the performance of side-entering mixers.
A A Dakhel and M Rahimi [3] studied the homogenization time of two layers of crude oils in 19000 m³ floating roof storage tank using CFD, and the results showed good agreement with experiment data.
In summary, it can be said the numerical simulation of side-entering agitators have not been carried out in the process of gasoline blending.
Online since: September 2013
Authors: Tao Zhang, Ying Xu, Xiang Hong Zhang, Lu Gao
Optimum Design of a Screw-In Venturi Flow Sensor
Ying Xu 1, Xianghong Zhang 1, a, Tao Zhang 1 and Lu Gao 1
1Tianjin Key Laboratory for Process Measurement and Control, School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
a532907288@qq.com
Key word: Discharge coefficient linearity; Screw-in blade; CFD; Orthogonal array
Abstract.
To study discharge coefficient linearity of screw-in venturi flow sensor, the effect of the screw-in blade attached to the sensor on discharge coefficient was analyzed, the structure of the screw-in blade was optimized by CFD software.
The numerical simulation indicates discharge coefficient linearity of the optimal screw-in venturi flow sensor is 0.601%,which is better than that of double-cone venturi flow sensor.
In CFD, Tgrid is chosen for mesh dividing of numerical simulation, the grid cell is Tet/Hybrid.
The result of numerical simulation for double-cone venturi flow sensor and optimum screw-in venturi flow sensor, which corresponds to optimum structure of screw-in blade, is listed in Table 3.
To study discharge coefficient linearity of screw-in venturi flow sensor, the effect of the screw-in blade attached to the sensor on discharge coefficient was analyzed, the structure of the screw-in blade was optimized by CFD software.
The numerical simulation indicates discharge coefficient linearity of the optimal screw-in venturi flow sensor is 0.601%,which is better than that of double-cone venturi flow sensor.
In CFD, Tgrid is chosen for mesh dividing of numerical simulation, the grid cell is Tet/Hybrid.
The result of numerical simulation for double-cone venturi flow sensor and optimum screw-in venturi flow sensor, which corresponds to optimum structure of screw-in blade, is listed in Table 3.
Online since: May 2025
Authors: Amirah Mohamad Sahar, Yahaya Nor Zaiazmin, Mohamad Shaiful Ashrul Ishak
However, there was limited research using a CFD tool to predict the flow pattern and develop the flow pattern maps.
Properties of gas and liquid used in simulations.
(a) The computational mesh used in the simulations.
The simulations are performed in commercial CFD solver ANSYS Fluent and the simulations are run in a transient mode.
Therefore, the study also shows that CFD method is a feasible way to draw the two-phase flow patterns map.
Properties of gas and liquid used in simulations.
(a) The computational mesh used in the simulations.
The simulations are performed in commercial CFD solver ANSYS Fluent and the simulations are run in a transient mode.
Therefore, the study also shows that CFD method is a feasible way to draw the two-phase flow patterns map.
Online since: August 2013
Authors: Bai Ping Xu, Hui Wen Yu, Xiao Long Wang, Gang Xue, Liang He
The numerical simulation of the three-dimensional flow and mixing in the metering zone was carried out for different screw configurations to determine the effect of the number of the small planetary-screws using CFD finite volume method technology.
In this paper, the numerical simulation was carried out for different configuration models of embedded planetary-screw extruder using finite volume method CFD(Computational Fluid Dynamics) technology.
A series of studies were in advance through experiments and numerical simulation methods.
Numerical simulation of flow in the metering region The CFD simulation of the metering zone was first carried out by finite volume method using the software FLUENT, where the small screws were simplified as the smooth cylinders with axial velocity.
Conclusions Numerical simulation was carried out to examine the different configurations of embedded planetary-screw by CFD technology method.
In this paper, the numerical simulation was carried out for different configuration models of embedded planetary-screw extruder using finite volume method CFD(Computational Fluid Dynamics) technology.
A series of studies were in advance through experiments and numerical simulation methods.
Numerical simulation of flow in the metering region The CFD simulation of the metering zone was first carried out by finite volume method using the software FLUENT, where the small screws were simplified as the smooth cylinders with axial velocity.
Conclusions Numerical simulation was carried out to examine the different configurations of embedded planetary-screw by CFD technology method.
Online since: May 2012
Authors: Huang Hsing Pan, Po Chang Lee, Chuan Tsung Lee, Ray Yeng Yang
Marine engineers also have been used CFD to simulate ship flow to realize the flow field of a ship under the same conditions as with tank experiments [10].
In this CFD simulation, effects of attack angle of underwater vehicle rudders without propeller are investigated.
Simulated results were calculated by CFD computations for the non steady state when the vehicle submerged, shown in Table 1, where flow velocity of 1.0 m/sec was applied to the rudder.
This result is the same as CFD simulations.
Fig. 7 Optimum angles at 0.65 m/sec current Conclusions The tested underwater vehicle with two rudders working in Kuroshio for carrying generators was investigated by CFD simulation and the experiments.
In this CFD simulation, effects of attack angle of underwater vehicle rudders without propeller are investigated.
Simulated results were calculated by CFD computations for the non steady state when the vehicle submerged, shown in Table 1, where flow velocity of 1.0 m/sec was applied to the rudder.
This result is the same as CFD simulations.
Fig. 7 Optimum angles at 0.65 m/sec current Conclusions The tested underwater vehicle with two rudders working in Kuroshio for carrying generators was investigated by CFD simulation and the experiments.