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Online since: October 2015
Authors: Lúcio Barreto Pereira, Rafael Nacife Carneiro, Rudolf Huebner
Simulation
Model Data.
The first part of the simulation consisted of manually setting these parameters.
This is advantageous because the time of simulation is proportional to the Young’s modulus.
However, the tangential friction coefficient does not influence the process, and to optimize the simulation, a value should be chosen to minimize the simulation time.
[5] Fries, L., Antonyuk, S., Heinrich, S., Dopfer, D. and Palzer, S., Collision dynamics in fluidized bed granulators A DEM-CFD study, Chemical Engineering Science, 86, p. 108, (2013)
The first part of the simulation consisted of manually setting these parameters.
This is advantageous because the time of simulation is proportional to the Young’s modulus.
However, the tangential friction coefficient does not influence the process, and to optimize the simulation, a value should be chosen to minimize the simulation time.
[5] Fries, L., Antonyuk, S., Heinrich, S., Dopfer, D. and Palzer, S., Collision dynamics in fluidized bed granulators A DEM-CFD study, Chemical Engineering Science, 86, p. 108, (2013)
Online since: July 2013
Authors: Jiao Gao, Dong Hui Zhang
Numerical simulations for hydrodynamically laminar flow was direct ran at Re between 600 and 1800.
Physical Models Fig.1 Arc belt geometric model Results and Analysis of Numeric Simulation CFD is applied for the simulation [5]-[7].Due to the disturbance of the arc belt, the flow direction and the speed change continuously.
It is found that enhanced tube can get better heat tranfer effect in the range of Reynolds number Re of simulation.
Mechanism of Heat Transfer Enhancement in the Core Flow of a Tube and Its Numerical Simulation.
Physical Models Fig.1 Arc belt geometric model Results and Analysis of Numeric Simulation CFD is applied for the simulation [5]-[7].Due to the disturbance of the arc belt, the flow direction and the speed change continuously.
It is found that enhanced tube can get better heat tranfer effect in the range of Reynolds number Re of simulation.
Mechanism of Heat Transfer Enhancement in the Core Flow of a Tube and Its Numerical Simulation.
Online since: September 2011
Authors: Jiang Meng, Lin Yang, Zheng Liang, Lian Cheng Ren, Jia Lin Tian
On the base of numerical simulation and theoretical analysis, the flow field of a conventional single-tangential-inlet Hydrocyclone and a newly put forward axial-symmetry double-tangential-inlet hydrocyclone were contrasted.
In the research, numerical simulation and theoretical analysis are employed.
The CFD software Fluent 6.2 is used.
In the numerical simulation mode, the 3-D mole is meshed with structure grids, Reynolds stress model is selected as turbulence models and Mixture model is selected as multiphase model.
Fig .8 Radial Velocity curves the Hydrcyclone A Fig .9 Radial Velocity curves of Hydrcyclone B The numerical simulation ruselt above shows that the inlet structrue of the hydrocyclone has an important influence on the radial velocity.
In the research, numerical simulation and theoretical analysis are employed.
The CFD software Fluent 6.2 is used.
In the numerical simulation mode, the 3-D mole is meshed with structure grids, Reynolds stress model is selected as turbulence models and Mixture model is selected as multiphase model.
Fig .8 Radial Velocity curves the Hydrcyclone A Fig .9 Radial Velocity curves of Hydrcyclone B The numerical simulation ruselt above shows that the inlet structrue of the hydrocyclone has an important influence on the radial velocity.
Online since: October 2004
Authors: Beom Soo Kang, Byung Young Moon, Chun Tae Lee
And the vehicle
dynamic characteristics of the proposed model are evaluated using quarter car simulation model.
In Fig. 7(a), the simulation result of the DSSA is presented in damping force versus stroke against the ±30 mm step input.
In Fig. 7(b), the simulation result of the DSSA is presented in damping force versus velocity against the ±30 mm step input.
The simulation results of response are compared with the ones of passive shock absorber.
Roth; A Shock Absorber Model Using CFD Analysis and Easy5, SAE International Congress and Exposition(1999), pp.1322 [4] Stefaan W.
In Fig. 7(a), the simulation result of the DSSA is presented in damping force versus stroke against the ±30 mm step input.
In Fig. 7(b), the simulation result of the DSSA is presented in damping force versus velocity against the ±30 mm step input.
The simulation results of response are compared with the ones of passive shock absorber.
Roth; A Shock Absorber Model Using CFD Analysis and Easy5, SAE International Congress and Exposition(1999), pp.1322 [4] Stefaan W.
Online since: May 2014
Authors: Jean Sébastien Cagnone, Koen Hillewaert, Nicolas Poletz
This paper describes the development of a multiphysics welding simulation model based on
the discontinuous Galerkin (DG) finite-element method.
In particular, this formulation offers arbitrarly-high order of spatial accuracy on highly unstructured meshes, thus combining the precision of academic research codes with the adaptability of general purpose CFD solvers.
In this work, the DG approach is extended to the simulation of manufacturing processes involving metal fusion, such as welding.
This work represents a first step towards a high-fidelity fusion welding simulation package, with future efforts dedicated to extensive mesh-refinement studies, the implementation of a deformable free-surface, industrial applications, and in the longer run hp-adaptive simulations.
Melting of a pure metal on a vertical wall: numerical simulation.
In particular, this formulation offers arbitrarly-high order of spatial accuracy on highly unstructured meshes, thus combining the precision of academic research codes with the adaptability of general purpose CFD solvers.
In this work, the DG approach is extended to the simulation of manufacturing processes involving metal fusion, such as welding.
This work represents a first step towards a high-fidelity fusion welding simulation package, with future efforts dedicated to extensive mesh-refinement studies, the implementation of a deformable free-surface, industrial applications, and in the longer run hp-adaptive simulations.
Melting of a pure metal on a vertical wall: numerical simulation.
Online since: October 2013
Authors: Hai Qing Si, Yan Shi, Xiao Jun Wu, Bing Wang
Introduction
The Lattice Boltzmann method (LBM) is a well-known alternative computational fluid dynamics (CFD) method for modeling fluid flows, due to its intrinsic advantages over conventional Navier-Stokes schemes[1-2].
Kam et al. [8] determined what the commonly used non-reflecting boundary conditions (NRBC) for DNS simulations could be extended to the LBM, they identified a best-performing NRBC for one-step LBM simulation of aeroacoustic problems.
In order to suppress the undesirable disturbances at the far-field boundaries, IABC is used in the simulation.
In the subsequent acoustic simulation, is adopted.
A., and Campbell, D.M., Lattice BGK simulation of sound waves, Europhys.
Kam et al. [8] determined what the commonly used non-reflecting boundary conditions (NRBC) for DNS simulations could be extended to the LBM, they identified a best-performing NRBC for one-step LBM simulation of aeroacoustic problems.
In order to suppress the undesirable disturbances at the far-field boundaries, IABC is used in the simulation.
In the subsequent acoustic simulation, is adopted.
A., and Campbell, D.M., Lattice BGK simulation of sound waves, Europhys.
Online since: May 2013
Authors: Ladislav Morovič, Jozef Peterka, Ivan Buranský
Introduction
The techniques of 3D digitization, 3D CAD modelling and simulation of CNC milling described in this article were carried out in Centre of Excellence of 5-Axis Machining of Faculty of Materials Science and Technology, Slovak University of Technology in Trnava, Slovakia.
Second part of machining simulation was carried out in the software DELCAM PowerMILL, into which the simulation result from the software DELCAM FeatureCAM was imported as a semi-finished product for gearing (Fig. 4) and wing manufacturing.
The result of the simulation is shown in Fig. 9.
Fig. 3 Machining operations generated in the software DELCAM FeatureCAM Fig. 4 Semi-finished part with 3D model of PSP clamped in the chucking appliance Fig. 5 Simulation of milling of PSP on CNC machine DMG Ultrasonic 20 Linear Fig. 6 Paths of roughing and the result of simulation Fig. 7 Paths of semi-finishing and the result of simulation Fig. 8 Paths of finishing and the result of simulation Fig. 9 Final shape of the part after CAM simulation Manufacturing of a printer spare part with Rapid Prototyping technology The term of RP mainly means production methods of those objects, which are manufactured in gradual addition of building material layer by layer.
Baškarić: CFD analysis of a concept car in order to improve aerodynamics.
Second part of machining simulation was carried out in the software DELCAM PowerMILL, into which the simulation result from the software DELCAM FeatureCAM was imported as a semi-finished product for gearing (Fig. 4) and wing manufacturing.
The result of the simulation is shown in Fig. 9.
Fig. 3 Machining operations generated in the software DELCAM FeatureCAM Fig. 4 Semi-finished part with 3D model of PSP clamped in the chucking appliance Fig. 5 Simulation of milling of PSP on CNC machine DMG Ultrasonic 20 Linear Fig. 6 Paths of roughing and the result of simulation Fig. 7 Paths of semi-finishing and the result of simulation Fig. 8 Paths of finishing and the result of simulation Fig. 9 Final shape of the part after CAM simulation Manufacturing of a printer spare part with Rapid Prototyping technology The term of RP mainly means production methods of those objects, which are manufactured in gradual addition of building material layer by layer.
Baškarić: CFD analysis of a concept car in order to improve aerodynamics.
Online since: February 2014
Authors: Rui Qing Chen, Yi Wei Lu, Jiang Feng Mou
The experiment show that the direct injection engine lean burn limit can increase 1.8 ~ 2.5 AFR unit.
1 Calculation model
In order to verify the simulation accuracy, the combination of 3D simulation and steady flow test bench is shown in figure 1.
According to the GDI-4G15 gasoline engine meshing scheme, we use AVL-FIRE software to simulation the oil and gas mixing process in cylinder.
On the basis of the above boundary conditions, this paper develop the numerical simulation of the compound injection system.
New Approach to Turbocharger Optimization using 1-D Simulation Tools[C].
CFD Investigation of Wall Wetting in a GDI Engine under Low Temperature Cranking Operations[C].
According to the GDI-4G15 gasoline engine meshing scheme, we use AVL-FIRE software to simulation the oil and gas mixing process in cylinder.
On the basis of the above boundary conditions, this paper develop the numerical simulation of the compound injection system.
New Approach to Turbocharger Optimization using 1-D Simulation Tools[C].
CFD Investigation of Wall Wetting in a GDI Engine under Low Temperature Cranking Operations[C].
Online since: August 2014
Authors: Xiao Dong Yu, Hui Jiang, Lan Yang, Yan Qin Zhang, Qi Hui Zhou, Xiu Li Meng, Zhi Qiang Wang
This study theoretically analyzes the influence of recess shape on the bearing pressure characteristic according to Computational Fluid Dynamics (CFD) and lubricating theory.
The simulation results indicate that an improved characteristic will be affected by recess shape easily.
Numerical simulation results and discussions In order to study the recess shape impacting on the film pressure field, when the inlet flow capacity is 0.098 kg/s, rotation velocity is 6rpm and choose viscosity of lubricating oilequals 0.0288 Pa·s, densityequals 880 kg/m3, the recess shape assign respectively rectangular recess, sector recess, ellipse recess and I-shaped recess, the three-dimensional pressure fields are obtained in CFX to be as Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12.
The simulation results indicate that an improved characteristic will be affected by recess shape easily.
Numerical simulation results and discussions In order to study the recess shape impacting on the film pressure field, when the inlet flow capacity is 0.098 kg/s, rotation velocity is 6rpm and choose viscosity of lubricating oilequals 0.0288 Pa·s, densityequals 880 kg/m3, the recess shape assign respectively rectangular recess, sector recess, ellipse recess and I-shaped recess, the three-dimensional pressure fields are obtained in CFX to be as Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12.
Online since: June 2007
Authors: Dong Ying Ju, Xiao Dong Hu
Simulation of Inelastic Deformation and Thermal Mechanical Stresses
in Twin-roll Casting Process of Mg Alloy
Xiao-Dong Hu1, a, Dong-Ying Ju1,b
1
Saitama Institute of Technology, Fusaiji 1690, Fukaya, 369-0293, Saitama, Japan
a
q4501pmu@sit.ac.jp, bdyju@sit.ac.jp
Keywords: Twin-roll casting, Thin strip,Inelastic model, Thermal stresses, Magnesium alloy.
Firstly, the thermal fluid flow of twin-roll casting process was simulated by using a CFD model based on ANSYS FLOTRAN; then the inelastic solid model based on Anand's model was employed to calculate the thermal stress in casting process.
Thermal flow simulation Governing equatuion.
Following assumptions were made for thermal flow simulation: heat transfer coefficient on the strip/roll interface was constant; rollers surface temperature 373K; side dams and nozzle were adiabatic; non-slip conditions were assumed on roll/metal interface.
Based on the assumptions steady-state simulations were performed.
Firstly, the thermal fluid flow of twin-roll casting process was simulated by using a CFD model based on ANSYS FLOTRAN; then the inelastic solid model based on Anand's model was employed to calculate the thermal stress in casting process.
Thermal flow simulation Governing equatuion.
Following assumptions were made for thermal flow simulation: heat transfer coefficient on the strip/roll interface was constant; rollers surface temperature 373K; side dams and nozzle were adiabatic; non-slip conditions were assumed on roll/metal interface.
Based on the assumptions steady-state simulations were performed.