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Reconstruction of natural convection within an enclosure using deep neural network EI SCIE
期刊论文 | 2021 , 164 | International Journal of Heat and Mass Transfer
WoS CC Cited Count: 3
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Abstract :

The deep neural network (DNN) is an extensively used technique to fit the high dimensional data. Fluid flow and heat transfer in macroscale are one of the complex physical phenomena which are governed by the Navier-Stokes (N-S) equation. The conventional numerical method (e.g., finite difference method) can solve the equation with corresponding boundary conditions using kinds of spatial discretized methods. In the present paper, the deep neural network can also be used to train and compute the results even if the training data only comes from boundary conditions of velocities and temperature. For the natural convection with few computational fluid dynamics (CFD) based velocities and temperature, the loss function of deep neural network, which mixes the explicit constraint of N-S equation, can reconstruct the fluid and heat field accurately. Usually, the complex geometry or high Rayleigh (Ra) number are corresponding to the complicate distribution of velocities and temperature field, which need more training points to achieve impressive accuracy. The present paper comprehensively investigates reconstructing results with different training data when Ra=103, and finds that only 1.48% points of CFD based data can obtain the impressive conclusion. Besides, the attempt of predicting velocities and temperature of the whole domain from partial region training data has been conducted. Global relative errors of velocities and temperature of Ra=105converge to the value, which is a little larger thanRa=104, although the latter case possesses more training points. When increasing the Rayleigh number to 106, the reconstruction of unsteady natural convection still remains high accuracy even if only 10 snapshots are considered. For the reconstruction of natural convection with complex geometry, the results show that more training points should be fed into the deep neural network to train and learn accurate results. © 2020 Elsevier Ltd

Keyword :

Natural convection Flow of fluids Neural networks Clustering algorithms Deep neural networks Computational fluid dynamics Finite difference method Complex networks Numerical methods Velocity Navier Stokes equations Boundary conditions Geometry

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GB/T 7714 Wang, Tongsheng , Huang, Zhu , Sun, Zhongguo et al. Reconstruction of natural convection within an enclosure using deep neural network [J]. | International Journal of Heat and Mass Transfer , 2021 , 164 .
MLA Wang, Tongsheng et al. "Reconstruction of natural convection within an enclosure using deep neural network" . | International Journal of Heat and Mass Transfer 164 (2021) .
APA Wang, Tongsheng , Huang, Zhu , Sun, Zhongguo , Xi, Guang . Reconstruction of natural convection within an enclosure using deep neural network . | International Journal of Heat and Mass Transfer , 2021 , 164 .
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Reconstruction of Fluid Flows Past Airfoils Using Neural Network EI
期刊论文 | 2021 , 42 (5) , 1205-1212 | Journal of Engineering Thermophysics
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Abstract :

Present paper attempts to reconstruct 2D unsteady flow field using neural network when fluid flows past airfoils at low Reynolds number. First of all, the details of fluid domain are obtained by solving incompressible fluid governing equation using our own developed fluid solver based on local radial basis function (LRBF) method, and then some randomly selected tempo-spatial points (with velocities and pressure information) are fed into neural network to train. The training process of first step is to learn Reynolds number, continuing with reconstruction of fluid field and comparison with numerical results. The flow Reynolds number is set as 200, while angle of attack is 20°. Besides, the locally refined nodes distribution of spatial domain is to globally reduce the computing resource. © 2021, Science Press. All right reserved.

Keyword :

Angle of attack Unsteady flow Neural networks Airfoils Reynolds number

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GB/T 7714 Wang, Tong-Sheng , Sun, Zhong-Guo , Huang, Zhu et al. Reconstruction of Fluid Flows Past Airfoils Using Neural Network [J]. | Journal of Engineering Thermophysics , 2021 , 42 (5) : 1205-1212 .
MLA Wang, Tong-Sheng et al. "Reconstruction of Fluid Flows Past Airfoils Using Neural Network" . | Journal of Engineering Thermophysics 42 . 5 (2021) : 1205-1212 .
APA Wang, Tong-Sheng , Sun, Zhong-Guo , Huang, Zhu , Xi, Guang . Reconstruction of Fluid Flows Past Airfoils Using Neural Network . | Journal of Engineering Thermophysics , 2021 , 42 (5) , 1205-1212 .
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A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem EI SCIE
期刊论文 | 2021 , 378 | Computer Methods in Applied Mechanics and Engineering
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Abstract :

Dealing with complex geometry boundaries is a challenge for particle boundary conditions. Since the effective area of the fluid particle is cut off by the boundary, it is difficult to obtain accurate results near the boundary, especially for complex geometry shapes. Things become more complicated when dealing with multiple sizes of particles in multi-resolution particle methods. In this paper, a generic smoothed wall (GSW) boundary is proposed by using single layer particles to accurately discretize the boundary. The boundary weight function is transformed to a distance function to fill the vacancy of the particle number density of fluid particles. The GSW boundary can be applied in the static, moving and non-linear deforming wall conditions. It also can be used to effectively handle complex geometric boundaries, since simulation results are not affected by changes in the number and size of wall particles. In addition, the GSW boundary also shows good results when combined with multi-resolution methods solving problems with multiple sizes of particles. In this paper, the MPS–DEM coupling method with GSW boundary model is applied to solve non-linear FSI problem. Several cases have been calculated to validate the accuracy, convergency and stability of the GSW boundary model. Compared with dummy particle boundary, results show that the proposed GSW boundary model can improve the numerical accuracy near the boundary, and handle arbitrary moving boundaries with high efficiency. © 2021 Elsevier B.V.

Keyword :

Geometry Computer applications Computational methods

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GB/T 7714 Sun, Yijie , Xi, Guang , Sun, Zhongguo . A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem [J]. | Computer Methods in Applied Mechanics and Engineering , 2021 , 378 .
MLA Sun, Yijie et al. "A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem" . | Computer Methods in Applied Mechanics and Engineering 378 (2021) .
APA Sun, Yijie , Xi, Guang , Sun, Zhongguo . A generic smoothed wall boundary in multi-resolution particle method for fluid–structure interaction problem . | Computer Methods in Applied Mechanics and Engineering , 2021 , 378 .
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Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes EI
期刊论文 | 2021 , 42 (1) , 115-120 | Journal of Engineering Thermophysics
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Abstract :

In this paper, a finite volume WENO scheme on OpenFOAM, which can achieve arbitrary high order and be applied to unstructured grids, is used to simulate the viscous shock tube. The simulation is conducted on structured grids and triangular unstructured grids, in which the third-order and fourth-order WENO schemes are used to discretize the convection term. The results show that the accuracy and efficiency of the scheme on triangular unstructured grids are better than that on structured grids, and the efficiency of the third-order WENO scheme is higher than that of the fourth-order scheme. This work shows that the third-order WENO scheme with unstructured grids on OpenFOAM has more advantages and application potential in the simulation of complex flow fields such as internal flow of turbomachinery. © 2021, Science Press. All right reserved.

Keyword :

Shock tubes Efficiency

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GB/T 7714 Chai, De-Lin , Xi, Guang , Sun, Zhong-Guo . Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes [J]. | Journal of Engineering Thermophysics , 2021 , 42 (1) : 115-120 .
MLA Chai, De-Lin et al. "Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes" . | Journal of Engineering Thermophysics 42 . 1 (2021) : 115-120 .
APA Chai, De-Lin , Xi, Guang , Sun, Zhong-Guo . Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes . | Journal of Engineering Thermophysics , 2021 , 42 (1) , 115-120 .
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Bypass transition in flow over a vibrating flat plate EI SCIE
期刊论文 | 2021 , 909 | JOURNAL OF FLUID MECHANICS
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Abstract :

The development of free-stream disturbances in flow over a vertically vibrating flat plate with a slender leading edge is investigated. The evolution of the optimal inflow perturbation that results in the maximum amplification is computed to investigate the effect of the plate vibration on the development of free-stream disturbance, secondary instability of streaks and subsequently the bypass transition to turbulence. It is observed that the plate vibration leads to periodic change of the angle of attack, shifting the free-stream disturbance to the upper or lower side of the plate. Therefore, the development of steady inflow perturbations, which receive the largest amplification, is interrupted by the vibration, and the perturbation amplification via the lift-up mechanism is weakened. The vibration brings a second peak of perturbation growth at the vibration frequency, leading to high-frequency free-stream perturbations penetrating into the base boundary layer, which is not observed in flow over a stationary plate owing to the sheltering mechanism. This resonance of the flow perturbation and the vibrating plate is explained by the staggering effect of the leading edge. Further, the direct numerical simulations with the optimal inflow perturbation imposed on the inflow boundary show that the vertical vibration of the plate leads to streamwise periodic vorticity near the edge of the boundary layer. This inhomogeneity of the streamwise vorticity brings about streamwisely localized distortion of the low-speed streaks and, thus, an intermittent secondary instability. Therefore, before the streaks break down to turbulence, they undergo several rounds of secondary instabilities, resulting in an elongated bypass transition process.

Keyword :

transition to turbulence flow-structure interactions boundary-layer stability

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GB/T 7714 Huang, Wenlin , Xiao, Dandan , Ren, Jie et al. Bypass transition in flow over a vibrating flat plate [J]. | JOURNAL OF FLUID MECHANICS , 2021 , 909 .
MLA Huang, Wenlin et al. "Bypass transition in flow over a vibrating flat plate" . | JOURNAL OF FLUID MECHANICS 909 (2021) .
APA Huang, Wenlin , Xiao, Dandan , Ren, Jie , Wang, Zhiheng , Xi, Guang , Mao, Xuerui . Bypass transition in flow over a vibrating flat plate . | JOURNAL OF FLUID MECHANICS , 2021 , 909 .
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Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method EI
期刊论文 | 2021 , 55 (5) , 162-170 | Journal of Xi'an Jiaotong University
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Abstract :

The flow field of a Y-type active micromixer with an impeller and two inlets is numerically simulated using moving the particle semi-implicit method, in which the fully developed velocity inlet model and the moving boundary model are combined. A high efficiency inclined continuous inlet model based on position judgment is proposed. A local mixing rate calculation method, which can describe ideal ordered mixing, is defined, and the key parameters of this method are determined through numerical experiments. Simulation of the flow field shows that for the continuous mixing of two immiscible liquids, the mixing mainly happens in the counter current region of the chamber. The mixing index at the outlet channel fluctuates periodically due to the multiple effects of continuous inflow, rotation of blade, and geometry of this mixer. This paper reveals the mixing mechanism and the transportation process in a steady-state period, and studies the influences of inlet velocity and rotating speed on mixing index. It is found that the mixing index can be improved by properly reducing the inlet flow rate or increasing the rotating speed, but the mixing degree will decrease if the inlet flow rate is too small. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Mixing Computational methods Flow fields Mixers (machinery) Numerical methods Rotating machinery Inlet flow

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GB/T 7714 Wang, Feng , Sun, Zhongguo , Liu, Qixin et al. Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method [J]. | Journal of Xi'an Jiaotong University , 2021 , 55 (5) : 162-170 .
MLA Wang, Feng et al. "Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method" . | Journal of Xi'an Jiaotong University 55 . 5 (2021) : 162-170 .
APA Wang, Feng , Sun, Zhongguo , Liu, Qixin , Zhang, Kai , Xi, Guang . Numerical Analysis of the Flow Field in a Y-Type Micromixer Using Moving Particle Semi-Implicit Method . | Journal of Xi'an Jiaotong University , 2021 , 55 (5) , 162-170 .
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A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller EI SCIE
期刊论文 | 2021 , 143 (10) | Journal of Mechanical Design, Transactions of the ASME
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Abstract :

A full-range prediction model for turbomachinery based on the flow-field information code is established in this article to solve the problems that traditional models do not have enough prediction accuracy and cannot reflect the complete performance characteristics of the impeller. The model, which can predict the complete performance curve of the impeller with higher accuracy, consists of two multilayer artificial neural network (ANN) submodels. Different from the traditional model, the ANN submodel uses the flow-field information code for pretraining layer by layer. The flow-field information code is the characteristic information extracted from the impeller flow field through the proper orthogonal decomposition (POD) method. By implicitly learning the flow-field information, the prediction error of the model is reduced by 29.7% compared with the single hidden layer ANN. Based on this model, the nonaxisymmetric, but periodic, hub optimization of a centrifugal impeller with 30 variables is carried out, with the goals of the higher efficiency and the wider flow range at the specified pressure ratio and the massflow rate at the design point. The result shows that, after the optimization, the isentropic efficiency at the design point increases by 1% and the flow range increases by 2% compared to the baseline. Copyright © 2021 by ASME

Keyword :

Multilayer neural networks Centrifugation Predictive analytics Forecasting Efficiency Impellers Flow fields

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GB/T 7714 Ji, Cheng , Wang, Zhiheng , Tang, Yonghong et al. A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller [J]. | Journal of Mechanical Design, Transactions of the ASME , 2021 , 143 (10) .
MLA Ji, Cheng et al. "A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller" . | Journal of Mechanical Design, Transactions of the ASME 143 . 10 (2021) .
APA Ji, Cheng , Wang, Zhiheng , Tang, Yonghong , Xi, Guang . A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller . | Journal of Mechanical Design, Transactions of the ASME , 2021 , 143 (10) .
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Comparison study on stage performance of centrifugal compressors with shrouded and unshrouded impellers EI
会议论文 | 2021 , 2D-2021 | ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, GT 2021
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Abstract :

The shrouded and unshrouded impellers are two typical kinds of impellers, which are widely utilized in centrifugal compressors of various applications. Centrifugal compressors with unshrouded impellers are generally recognized to display inferior performance to the shrouded impellers with the same geometry. In this paper, a comparative experiment shows some results inconsistent with conventional cognition. Measured performance indicates that the peak efficiency of the centrifugal compressor with an unshrouded impeller is higher than the shrouded one, where the two impellers have the same geometry of meridional profile and blade central plane, and matched the same vaneless diffuser and volute. In order to explore the causes of this divergence, the effects of factors such as blade thickness, surface roughness of components, tip clearance and sealing leakage characteristics on performance are analyzed by CFD code. Numerical results show that reasonable reduction in the blade thickness and improvement on the surface quality of the impeller could effectively increase the peak efficiency and the choke mass flow rate of the shrouded impeller. The unshrouded impeller with arbitrary blade surfaces would be deformed under the action of centrifugal force to achieve a small tip clearance during operation, and then obtains higher efficiency at design speed. The research results are helpful to evaluate the performance potential and sensitive design parameters of shrouded and unshrouded impellers. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.

Keyword :

Centrifugation Efficiency Surface roughness Impellers Centrifugal compressors Computational fluid dynamics Turbomachinery

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GB/T 7714 Xi, Guang , Zhao, Chenxi , Tang, Yonghong et al. Comparison study on stage performance of centrifugal compressors with shrouded and unshrouded impellers [C] . 2021 .
MLA Xi, Guang et al. "Comparison study on stage performance of centrifugal compressors with shrouded and unshrouded impellers" . (2021) .
APA Xi, Guang , Zhao, Chenxi , Tang, Yonghong , Wang, Zhiheng . Comparison study on stage performance of centrifugal compressors with shrouded and unshrouded impellers . (2021) .
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Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor EI
会议论文 | 2021 , 2D-2021 | ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, GT 2021
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Abstract :

The propagation characteristics of inlet total-pressure distortion in a centrifugal compressor are investigated by fullannulus unsteady three-dimensional numerical simulation. The inlet distortions considered in the paper are the total-pressure distortions covering a 60-deg sector (60deg distortion) and three 20-deg sectors (3∗20deg distortion), respectively. One is the classical distortion form, and the other is to simulate the downstream flow of the axial section of a centrifugal-axial combined compressor. By analyzing the distributions of flow parameters, the propagation of the total-pressure distortion in the centrifugal compressor is interpreted. The results show that, with the distortion propagating to the downstream, the lowpressure region produces a phase deviation along the streamwise direction relative to the opposite direction of impeller rotation direction, and the range of distortion region is reduced. Additionally, the propagation of the inlet distortion makes the three-dimensional characteristics of airflow more complex. The flow angle increases with different amplitudes along the direction of blade height corresponding to the distorted sector. The distortion region affects the location of blades which are in a low-pressure area, and the intensity of the distortion affects the increase of the flow angle. The distortion region causes more local relative flow losses, especially near the leading edge of blade suction surface. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.

Keyword :

Centrifugation Centrifugal compressors

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GB/T 7714 Wang, Mingyi , Wang, Zhiheng , Xi, Guang et al. Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor [C] . 2021 .
MLA Wang, Mingyi et al. "Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor" . (2021) .
APA Wang, Mingyi , Wang, Zhiheng , Xi, Guang , Li, Yurun . Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor . (2021) .
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Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification EI SCIE
期刊论文 | 2021 , 9 | FRONTIERS IN ENERGY RESEARCH
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In order to solve the environmental pollution problem caused by winter heating of rural residential building in northern of China, in this paper a biomass gasification (BG)-solid oxide fuel cell (SOFC) combined heat and power (CHP) system has been establishedand numerically investigated. Taking a rural village around Xi'an which is an ancient city and located at central of northern China as the study object, according to heat and electricity output of the system and the heating and electrical load characteristics of the residential building of village, the energy saving ratio and economical efficiency of the CHP system under three different operation schemes compared with the traditional energy system have been analyzed. The results show that the operation scheme for heating designated rooms in rural buildings and meeting the average heat demand of users is the most energy-efficient and economical way. The primary energy saving rate and annual cost saving rate can reach 18.0% and 10.3%, respectively. When the user's heat and power load demand is clear, the closer the system's output heat and power ratio to the user's heat and power load ratio, the more significant the system's energy saving effect.

Keyword :

combined heat and power system solid oxide fuel cell operation scheme biomass gasification performance analysis

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GB/T 7714 Dang, Zheng , Jiang, Zhaoyi , Ma, Jinyan et al. Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification [J]. | FRONTIERS IN ENERGY RESEARCH , 2021 , 9 .
MLA Dang, Zheng et al. "Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification" . | FRONTIERS IN ENERGY RESEARCH 9 (2021) .
APA Dang, Zheng , Jiang, Zhaoyi , Ma, Jinyan , Shen, Xin , Xi, Guang . Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification . | FRONTIERS IN ENERGY RESEARCH , 2021 , 9 .
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