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< Page ,Total 46 >
Numerical investigation of liquid dispersion by hydrophobic/hydrophilic mesh packing using particle method SCIE
期刊论文 | 2019 , 202 , 447-461 | CHEMICAL ENGINEERING SCIENCE
WoS CC Cited Count: 1
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Abstract :

Liquid dispersion in chemical processes is significant for increasing mass or heat transfer. A particle-based method, the moving particle semi-implicit (MPS) method, was employed in this study to simulate the process of liquid dispersion by mesh packing. The computational framework includes a designed inlet flow model, hydrophilic/hydrophobic surface boundary conditions, and a surface tension model. This study mainly focuses on the effect of hydrophobic/hydrophilic mesh packing on liquid dispersion performance. The mechanism of liquid dispersion is systematically investigated in basic situations as a liquid passing through a single wire, an orthogonal wire and a single aperture. The results indicate that hydrophobic and hydrophilic mesh packing have different effects on the formation of the free surface, which is the key to the mechanism of the liquid dispersion process. Hydrophobic mesh packing can disperse a liquid into several fine columns with detected droplets, which further develop into fine droplets, whereas hydrophilic mesh packing will guide a liquid to converge into a column at the bottom of the mesh packing. In addition, the surface area density and dispersion range of a liquid are quantitatively analyzed to illustrate liquid dispersion performance. (C) 2019 Elsevier Ltd. All rights reserved.

Keyword :

Moving particle semi-implicit method Surface area Hydrophilic Liquid dispersion Wettability Hydrophobic

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GB/T 7714 Liu, Qi-xin , Sun, Zhong-guo , Sun, Yi-jie et al. Numerical investigation of liquid dispersion by hydrophobic/hydrophilic mesh packing using particle method [J]. | CHEMICAL ENGINEERING SCIENCE , 2019 , 202 : 447-461 .
MLA Liu, Qi-xin et al. "Numerical investigation of liquid dispersion by hydrophobic/hydrophilic mesh packing using particle method" . | CHEMICAL ENGINEERING SCIENCE 202 (2019) : 447-461 .
APA Liu, Qi-xin , Sun, Zhong-guo , Sun, Yi-jie , Chen, Xiao , Xi, Guang . Numerical investigation of liquid dispersion by hydrophobic/hydrophilic mesh packing using particle method . | CHEMICAL ENGINEERING SCIENCE , 2019 , 202 , 447-461 .
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Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller EI Scopus
会议论文 | 2018 , 2B-2018 | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
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Abstract :

The synthetic jet, located at the shroud and close to the blade leading edge, is used to control the flow in a typical centrifugal impeller. The effects of the synthetic jet control and the interaction with the tip leakage flow are mainly investigated at the near-stall working point of impeller using the unsteady numerical analysis. The results indicate that, the effect of the synthetic jet with a small injection angle (15deg) is better when the excitation position is located over the main blade leading edge. However, the synthetic jet with a large injection angle (90deg) obtains a better result when the excitation position is located at the downstream of main blade leading edge. The synthetic jet with a larger velocity amplitude has a more remarkable effect on deflecting the main flow/tip leakage flow interface to the downstream direction. With typical parameters, the synthetic jet increases the circumferentially averaged streamwise location of the main flow/tip leakage flow interface by 12.5% compared with the case without a synthetic jet. The interaction between the tip leakage flow and synthetic jet makes the tip leakage flow out of the tip clearance with larger streamwise momentum, which is favorable to restrain the tip leakage flow to spill out the leading edge. Besides, the periodic blade loading drop is deflected to downstream direction and the flow fluctuation near the leading edge decrease significantly with the presence of synthetic jet. © Copyright 2018 ASME.

Keyword :

Centrifugal impeller Excitation position Flow fluctuations Injection angles Streamwise locations Tip leakage flow Unsteady numerical analysis Velocity amplitudes

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GB/T 7714 Huang, Wenlin , Zhao, Huijing , Wang, Zhiheng et al. Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller [C] . 2018 .
MLA Huang, Wenlin et al. "Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller" . (2018) .
APA Huang, Wenlin , Zhao, Huijing , Wang, Zhiheng , Xi, Guang , Liu, Haijun . Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller . (2018) .
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Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (1) , 33-45 | Tuijin Jishu/Journal of Propulsion Technology
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Abstract :

To investigate the effect of endwall synthetic jet(SJ) on vortex structure and flow loss reduction in a high-loaded turbine cascade, unsteady numerical model of Durham cascade with SJ installed at the endwall upstream of the blade was established. A series of simulations were performed to determine beneficial excitation parameters. At the optimal excitation parameters, the influence of SJ on vortex structure and flow loss were investigated in detail and the association between them was focused on. The results indicated that the sizes of the horseshoe vortex and passage vortex were reduced; the transverse vortex originated from adjacent pressure surface were weakened; the corner vortex was slightly strengthened; the wall vortex was receded indirectly. Total pressure loss coefficient was decreased by 10.72% at the optimal excitation parameters when dimensionless excitation amplitude and frequency were 0.073 and 1, respectively. From the perspective of control mechanism, SJ enhanced the mixing of main fluid and boundary-layer fluid downstream of the jet, the momentum of boundary-layer fluid increased, so that the horseshoe vortex was weakened. SJ influenced the boundary separation at the pressure face of the blade, the region and position of low-energy fluid caused by boundary separation were changed, so that the transverse vortex was weakened. Flow loss was reduced as a result of weakened vortexes. © 2018, Editorial Department of Journal of Propulsion Technology. All right reserved.

Keyword :

Active flow control Excitation parameters Flow loss Synthetic jets Vortex structures

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GB/T 7714 Yu, Hong-Shi , Wang, Zhi-Heng , Xi, Guang . Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade [J]. | Tuijin Jishu/Journal of Propulsion Technology , 2018 , 39 (1) : 33-45 .
MLA Yu, Hong-Shi et al. "Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade" . | Tuijin Jishu/Journal of Propulsion Technology 39 . 1 (2018) : 33-45 .
APA Yu, Hong-Shi , Wang, Zhi-Heng , Xi, Guang . Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade . | Tuijin Jishu/Journal of Propulsion Technology , 2018 , 39 (1) , 33-45 .
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Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser EI Scopus
会议论文 | 2018 , 2A-2018 | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
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Abstract :

The operating range of a centrifugal compressor is often limited by the occurrence of the flow instability, such as diffuser rotating stall or system surge. In the paper, the unsteady numerical simulations are performed on a low-speed centrifugal compressor to investigate the characteristic of the rotating stall in the vaned diffuser. And also, the developed model of lumped parameter is used to predict the system instability. The flow field in the diffuser is firstly investigated at near stall condition. It is found that the leading-edge vortex and the secondary flow induce the hub-corner separation at the suction side of the diffuser blade. When the mass flow rate is reduced gradually, the fore part of the volute turns to act as a diffuser from a nozzle. Under the influence of the asymmetry induced by the volute, the hub-corner separation firstly develops into rotating stall in the passage with the lowest mass flow rate when at critical stall point. And then the diffuser rotating stall propagates along the circumferential direction at about 7% of the impeller speed. And also, the model of lumped parameter considering the effect of rotating stall is developed to analyze the system instability of mild surge. The predicted vibration frequency is within 5.8% of the measurement and the predicted transient process in mild surge matches well with the measurement. With different volume of the compressed air, the transient compressor characteristic tends to be stabilized or oscillates in a cycle along the counter-clockwise with different magnitude. Copyright © 2018 ASME.

Keyword :

Circumferential direction Compressor characteristics Flow instabilities Leading-edge vortices Near stall conditions Numerical investigations Unsteady numerical simulations Vibration frequency

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GB/T 7714 Zhao, Yang , Xi, Guang , Zhao, Jiayi . Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser [C] . 2018 .
MLA Zhao, Yang et al. "Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser" . (2018) .
APA Zhao, Yang , Xi, Guang , Zhao, Jiayi . Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser . (2018) .
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The impact of circumferential casing grooves on rotating instability in a transonic axial compressor EI Scopus
期刊论文 | 2018 | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
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Abstract :

The impact of circumferential casing grooves on rotating instability is first assessed for both design and part speed operations in a transonic axial compressor, with the purpose of developing the next generation casing treatments for vibration control. Multi-passage time-resolved computations are performed to capture the origination and propagation behavior of the instability for cases with and without casing grooves. Probed pressure signals in different passages show a nonsynchronous fluctuation of tip flow. It proves tip leakage vortex and its self-excited oscillation is responsible for this type of inconsistence, regardless of the compressor operation speed. Although flow separation on blade suction surface and the consequent shedding vortex contributes to another origin of instability, the resulted flow appears to be consistent. Casing grooves are able to enhance the synchronization by greatly suppressing both tip leakage vortex oscillations and the intermittently shedding separation vortex, especially in the front part of blade passage. Both types of instability are constrained in several separated axial scope by casing grooves, which essentially increase the damping of flow oscillations. Thus, further improvement of casing treatment design can be expected if the axial transport of the instability in the tip region is restrained more efficiently, for both extending stall margin and enhancing aerodynamic stability. © 2018, © IMechE 2018.

Keyword :

Circumferential casing grooves nonsynchronous fluctuation Rotating instability Shedding vortex Speed operation Tip clearance vortex Transonic axial compressors

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GB/T 7714 Ye, Shubo , Zhao, Qingjun , Zhou, Xiaoyong et al. The impact of circumferential casing grooves on rotating instability in a transonic axial compressor [J]. | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , 2018 .
MLA Ye, Shubo et al. "The impact of circumferential casing grooves on rotating instability in a transonic axial compressor" . | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering (2018) .
APA Ye, Shubo , Zhao, Qingjun , Zhou, Xiaoyong , Xi, Guang , Xu, Jianzhong . The impact of circumferential casing grooves on rotating instability in a transonic axial compressor . | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , 2018 .
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The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser EI Scopus
会议论文 | 2018 , 2A-2018 | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
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Abstract :

The spike-type rotating stall(RS) inception inside the vaned-diffuser, which seriously restricts the performance range and brings the problems of blade fatigue, still seems to be a ‘mystery’ since its randomness. The paper intends to explain the mechanisms of this stall inception. To quantitatively assess the critical unsteady behavior to the initiation of RS inception, the transient measurement characterizes the process falling into the RS through the parameter of ‘blade passing irregularity’. The underlying vortex disturbance, related to the growing of the flow complexity and the final spike-type precursor, is further revealed by the full-annulus simulation. The results show the propagation principle of the vortexes from the design to the stall inception point, reflected by the distribution of ‘blade passing irregularity’. The performance change of different sub-components due to the vortex behavior is presented. At the RS limit, the sudden ramp-up of the ‘blade passing irregularity’ near the leading edge (LE), accompanied with the drop of the static pressure rise in the sub-component between the semi-vaneless and throat, corresponds to the spike-type inception in the form of a clockwise vortex connecting the suction side of the diffuser vane and the pressure side of the adjacent vane. Besides, when approaching the spike-type inception point, the couple effect of the growing potential of the diffuser vane and the enhanced vortex disturbance at the impeller outlet degrades the diffuser inlet flow. Copyright © 2018 ASME.

Keyword :

Impeller outlet Rotating stalls Stall inception Static pressure Transient measurement Unsteady behaviors Vaned diffuser Vortex behavior

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GB/T 7714 Zhao, Jiayi , Xi, Guang , Wang, Zhiheng et al. The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser [C] . 2018 .
MLA Zhao, Jiayi et al. "The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser" . (2018) .
APA Zhao, Jiayi , Xi, Guang , Wang, Zhiheng , Zhao, Yang . The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser . (2018) .
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Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (2) , 307-313 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

A two-way fluid-structure interaction model and a linear elastic cable model were established based on the moving particle semi-implicit (MPS) method. The motions of the moored offshore floating platform in regular waves were analyzed by numerical simulations. The hydrodynamic characteristics of the moored floating platform in different mooring types were investigated systematically, and the results conclude that the surge, heave and pitch of the platform and the force of the mooring cables all show a variation of trigonometric function in two-dimensional cases. Furthermore, it can effectively control the surge of the platform and reduce the heave when the number of mooring cables increases. The uneven forces to the platform could be avoided on the condition that the mooring positions were symmetrical to the mass center of the platform, which would decrease the swing angles of the platform. © 2018, Science Press. All right reserved.

Keyword :

Floating platforms Hydrodynamic characteristics Linear elastic Moving particle semiimplicit method MPS methods Offshore floating Trigonometric functions Two-way fluid structure interactions

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GB/T 7714 Sun, Yi-Jie , Sun, Zhong-Guo , Cao, Wen-Jin et al. Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) : 307-313 .
MLA Sun, Yi-Jie et al. "Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 2 (2018) : 307-313 .
APA Sun, Yi-Jie , Sun, Zhong-Guo , Cao, Wen-Jin , Xi, Guang . Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) , 307-313 .
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Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System EI Scopus CSCD PKU
期刊论文 | 2018 , 52 (3) , 12-18 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

To explore the methods of overcoming the two inherent drawbacks of renewable energy sources (i.e., intermittency and fluctuation), a novel compressed-air based pumped hydro energy storage (CA-PHES) system is proposed using the laws of thermodynamics and the principle of cascade energy utilization in this paper. Firstly, the thermodynamic model of the system was built to evaluate the system's thermodynamic performance. The energy efficiency of this system was investigated with respect to several key parameters, i. e., the discharge time of hydro turbine, the minimum pressure in the air storage cavern, the efficiency of each equipment and the distribution of pressure ratio in compressor and turbine. The result indicated that the system's energy efficiency increases with the increasing of the minimum air pressure in the air storage cavern. While with the increasing of the discharge time of hydro turbine, the energy efficiency reaches its maximum value at 1.5 hour and then decreases. Furthermore, the most effective way to improve the energy efficiency is to increase the isentropic efficiency of turbine. By employing an evolutionary multi-objective algorithm, the energy efficiency could reach 71.82%. The results could provide valuable theoretical basis for the further engineering application of this energy storage system. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Energy storage systems Engineering applications Evolutionary multi-objective algorithms Laws of thermodynamics Pumped-hydro energy storages Renewable energy source Thermo dynamic analysis Thermodynamic performance

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GB/T 7714 Yao, Erren , Xi, Guang , Wang, Huanran et al. Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (3) : 12-18 .
MLA Yao, Erren et al. "Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 52 . 3 (2018) : 12-18 .
APA Yao, Erren , Xi, Guang , Wang, Huanran , Zou, Hansen , Li, Ruixiong , Hu, Yang et al. Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (3) , 12-18 .
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Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor EI SCIE Scopus
期刊论文 | 2018 , 232 (6) , 674-690 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
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Abstract :

This paper presents a multi-objective optimization-based intelligence design method for the design of the three-dimensional vaned diffuser for a given centrifugal compressor. This design method consists of three-dimensional vaned diffuser design model and its solving strategy. The three-dimensional vaned diffuser design model consists of the diffuser geometry mathematical model, performance evaluation model, objective equation, and design space. The diffuser geometry is described by the mathematical model of the meridional configurations and vane camber, trailing edge lean, and thickness. The generic design space is determined through literature statistical investigation. An NSGA-II multi-objective optimization algorithm, utilized to solve the three-dimensional vaned diffuser design model, directs the diffuser geometry variables to achieve the maximum stage isentropic efficiency and static pressure ratio at the design point within the design space automatically and intelligently. The presented three-dimensional vaned diffuser design method is demonstrated using a case test for a centrifugal impeller. The convergence of evolutionary solving for this three-dimensional vaned diffuser model is analyzed in detail, which provides the convergence reference for engineering applications. Three representative three-dimensional vaned diffusers on Pareto front are utilized to check the diversity of geometry shape and overall range performance characteristics. The results show that the three-dimensional vaned diffuser design method established here has excellent potential in automated design and maximizing stage performance. The method reported here could provide a valuable reference for the intelligent design of radial turbomachinery diffusers.

Keyword :

multi-objective optimization intelligence design method three-dimensional vaned diffuser Centrifugal compressor

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GB/T 7714 Wang, Jian , Wen, Suping , Wang, Wenbo et al. Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (6) : 674-690 .
MLA Wang, Jian et al. "Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 232 . 6 (2018) : 674-690 .
APA Wang, Jian , Wen, Suping , Wang, Wenbo , Xi, Guang . Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (6) , 674-690 .
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An extension of advancing front technique on new target surface after virtual topology operations EI SCIE Scopus
期刊论文 | 2018 , 124 , 42-52 | ADVANCES IN ENGINEERING SOFTWARE
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Abstract :

In this paper, an extension of advancing front technique (AFT) on new target surface (NTS) after virtual topology operations has been achieved in order to suitably represent CAD model and enhance the accuracy of numerical analyses. The extension of AFT has been accomplished through two stages. In the first stage, through analysis of the connection features of the intersecting lines with geometric continuity, a new notion of NTS is proposed. Based on the new notion, the topology of NTS is adjusted to generate meshes and meet the requirements of numerical analyses. In the second stage, AFT is extended accordingly in order to realize the topology of NTS. Specifically, based on the concise description of the front configuration of AFT, all of the subordinate aspects of AFT, including meshing order, generation of elements and nodes, and validity checking, are optimized. With the extension of AFT in this fashion, the target surfaces of AFT have been extended from the parametric surfaces to the composite surfaces. Finally, two examples are calculated with the extended AFT. The results of the calculation have verified that the topology of the composite surfaces is suitable and that the extended AFT is accurate and efficient.

Keyword :

Advancing front technique (AFT) Composite surfaces New target surface (NTS) Geometric continuity

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GB/T 7714 Wang Wei , Fan Hongzhou , Xi Guang . An extension of advancing front technique on new target surface after virtual topology operations [J]. | ADVANCES IN ENGINEERING SOFTWARE , 2018 , 124 : 42-52 .
MLA Wang Wei et al. "An extension of advancing front technique on new target surface after virtual topology operations" . | ADVANCES IN ENGINEERING SOFTWARE 124 (2018) : 42-52 .
APA Wang Wei , Fan Hongzhou , Xi Guang . An extension of advancing front technique on new target surface after virtual topology operations . | ADVANCES IN ENGINEERING SOFTWARE , 2018 , 124 , 42-52 .
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