Jianyao Yao - Academia.edu (original) (raw)

Papers by Jianyao Yao

Research paper thumbnail of Critical role of surficial activity in the sintering process of TiO2 nanoparticles by molecular dynamics simulation

Research paper thumbnail of A Nonintrusive Parametrized Reduced-Order Model for Periodic Flows Based on Extended Proper Orthogonal Decomposition

International Journal of Computational Methods, 2021

The periodic flows, such as vortex shedding and rotating flow in turbomachinery, are very common ... more The periodic flows, such as vortex shedding and rotating flow in turbomachinery, are very common in both scientific and engineering fields. However, high-fidelity numerical simulations of unsteady flows are usually time-consuming, particularly when varying flow parameters need to be considered. In this paper, a novel nonintrusive parametrized reduced order model (PROM) approach for prediction of periodic flows is presented. The establishment of this ROM is based on two techniques, proper orthogonal decomposition (POD) and discrete Fourier transform (DFT), where the first one can extract the spatial features and the second has the ability to quantify the temporal effects of parameters. A prediction model based on artificial neural networks (ANNs) is used to map the flow parameters with DFT coefficients. Flows past a cylinder and two dimensions turbine flows are used to demonstrate the effectiveness of the proposed PROM. It is shown that the proposed POD-DFT-ANN (PDA) ROM are both eff...

Research paper thumbnail of Investigation of Probabilistic Design Method for Multi-layer Thermal Protection System

Research paper thumbnail of Ultrathin, Compacted Gel Polymer Electrolytes Enable High‐Energy and Stable‐Cycling 4 V Lithium‐Metal Batteries

Research paper thumbnail of Solvothermal synthesis of three-dimensional petaloid garnet electrolyte and its application in solid polymer electrolytes

Energy Storage Science and Technology, 2021

Research paper thumbnail of Analysis of Modal Characteristics and Reconstructions of Rotating Flow Field Using POD Method

The discrete POD method is used to analyze the rotating flow to further understand and accurately... more The discrete POD method is used to analyze the rotating flow to further understand and accurately model the details of the flow physics in this paper. The low-order flow modes are obtained using modified discrete POD method proposed by Sirovich, and are used for the reconstruction of the unsteady flow field. The unsteady rotational flow of a simplified impeller is used as numerical example to show the effectiveness of the POD method for the analysis of rotating flow. The numerical results show that the maximal reconstruction deviation is reduced to a very low level with a small increase in the number of low order modes. Furthermore, the regions at relatively high values of deviation shrink distinctly to impeller tip nearby in more accurate approximations.

Research paper thumbnail of Development of 3 D CFD solver based on gradient smoothing method *

Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, ... more Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, and we have smoothed finite element method (S-FEM) for solid mechanics [1-3] and GSM-CFD for fluid mechanics . Theories and numerical examples have demonstrated that the GSM-CFD solver is accurate, efficient, robust, and insensitive to mesh distortions. However, the previous research of GSM-CFD mainly focused on 2D cases, thus the 3D version GSM-CFD solver need to be developed to extend the applicability of the new CFD solver. During the development process, the method for the construction of smoothing domains (SDs) on 3D complex grids is firstly proposed, and the general data structure for SD is also devised. Then the algorithms for gradient approximation of flow variables in 3D domains are also developed, and the approximation accuracy is verified using manufactured solutions. The convective and viscous fluxes of Navier-Stokes equations are also discretized using GSM, and the 3D GSM-CF...

Research paper thumbnail of Keynote: Application of Agglomeration Multigrid Method in GSM-CFD Solver

GSM-CFD is a newly developed CFD solver for general compressible and incompressible problems. The... more GSM-CFD is a newly developed CFD solver for general compressible and incompressible problems. The first- and second order derivatives for flow variables are approximated using gradient smoothing operation, which is more robust to mesh distortion. Extensive applications have shown that the GSM-CFD solver is a competitive alternative to the convention finite volume method. In this research, the agglomeration multigrid method is incorporated to the GSM-CFD solver to further improve the numerical efficiency. The gradients at nodes of irregular agglomerated coarse mesh are also approximated on newly constructed node-based gradient smoothing domains. The transonic NACA 0012 airfoil is used as the numerical example to show the effectiveness of the proposed method.

Research paper thumbnail of Keynote: Development 3D CFD solver based on gradient smoothing method

Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, ... more Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, and we have smoothed finite element method (S-FEM) for solid mechanics and GSM-CFD for fluid mechanics. Theories and numerical examples have demonstrated that the GSM-CFD solver is accurate, efficient, robust, and insensitive to mesh distortions. However, the previous research of GSM-CFD mainly focused on 2D cases, thus the 3D version GSM-CFD solver will be developed here. First, the method for construction of smoothing domains (SDs) on 3D complex grids will be proposed, and the general data structure for SD will be devised. Then the algorithms for gradient approximation of flow field variables in 3D solution domains will be developed and verified. The Navier-Stokes equations will be discretized using GSM, and the 3D GSM-CFD solver is finally formed. The validation and verification of the proposed GSM-CFD solver will be carried out using the method of manufactured solutions, and the resu...

Research paper thumbnail of Hybrid poly-ether/carbonate ester electrolyte engineering enables high oxidative stability for quasi-solid-state lithium metal batteries

Research paper thumbnail of Synthesis and properties of poly(1,3-dioxolane) in situ quasi-solid-state electrolytes via a rare-earth triflate catalyst

Chemical Communications

Quasi-solid-state polymer electrolytes in situ initiated by abundant rare-earth triflate catalyst... more Quasi-solid-state polymer electrolytes in situ initiated by abundant rare-earth triflate catalysts will produce intimate electrolyte/electrodes interfaces and enable lithium metal anodes.

Research paper thumbnail of A facile method for the synthesis of a sintering dense nano-grained Na3Zr2Si2PO12 Na+-ion solid-state electrolyte

Chemical Communications

We report dense Na3Zr2Si2PO12 with an average grain size of 546 ± 58 nm and prepared by a facile ... more We report dense Na3Zr2Si2PO12 with an average grain size of 546 ± 58 nm and prepared by a facile method.

Research paper thumbnail of Ultrathin, dense, hybrid polymer/ceramic gel electrolyte for high energy lithium metal batteries

Research paper thumbnail of A composite electrolyte with Na3Zr2Si2PO12 microtube for solid-state sodium-metal batteries

Research paper thumbnail of Probabilistic Transient Heat Conduction Analysis Considering Uncertainties in Thermal Loads Using Surrogate Model

Journal of Spacecraft and Rockets

Thermal protection system (TPS) is one of the most important subsystems for vehicle reentry. Beca... more Thermal protection system (TPS) is one of the most important subsystems for vehicle reentry. Because of the uncertainties in thermal loads, material properties, and manufacture tolerances, the ther...

Research paper thumbnail of Mechanical properties and thickness-determined fracture mode of hexagonal boron nitride nanosheets under nanoindentation simulations

Computational Materials Science

Research paper thumbnail of Spider-Inspired Ultrasensitive Flexible Vibration Sensor for Multifunctional Sensing

Flexible vibration sensor can not only capture broad classes of physiologically relevant informat... more Flexible vibration sensor can not only capture broad classes of physiologically relevant information, including mechano-vibration signatures of body processes and precision kinematics of core-body motions, but also detect environmental seismic wave, providing early warning to wearer in time. Spider is one of the most vibration-sensitive creatures due to its hair-like sensilla and lyriform slit structure. Here a spider-inspired highly sensitive flexible vibration sensor is designed and fabricated for multifunctional sensing. The vibration sensitivity of the flexible sensor is increased over two orders of magnitude from 0.006 to 0.5 mV/g and the strain sensitivity is hugely enhanced from 0.08 to 150 compared to a plain sensor counterpart. It is shown that the synergistic effect of cilium arrays and cracks is the key for achieving the greatly enhanced vibration and strain sensitivity. The dynamic sensitivity of 0.5 mV/g outperforms the corresponding commercial sensors. The flexible sensor is demonstrated to be generally feasible for detecting vibration signals caused by walk, tumble and explosion as well as capturing human body motions, indicating its great potential for applications in human health monitoring devices, posture control of robotics and early earthquake warning, etc.

Research paper thumbnail of Numerical Study of Flame Propagation Morphology for Deflagration in the Pipeline Using Proper Orthogonal Decomposition

Advances in Civil Engineering

A multilevel independent spatial modal analysis of flame propagation characteristics of a deflagr... more A multilevel independent spatial modal analysis of flame propagation characteristics of a deflagration in a specific pipeline was performed using the proper orthogonal decomposition (POD) method, in order to research the evolution process of the explosion which is closely related to flame propagation speed and front rupture pressure. The CFD results indicated that the full-order calculation results well agreed with the normal combustion propagation characteristics of premixed methane-air for the flame propagation with the unbroken thin layer. The POD analysis results showed that the static temperature gradient of the 1st order mode of initial and subsequent stages both exhibited a range of continuity change from left to right, and the frontal curvature of the cooling area decreased as the flame propagated in all stages. The number of the low-temperature interval regions displayed an expanding form of a staircase with the increase of the mode order, especially for subsequent flame in...

Research paper thumbnail of Probabilistic Heat Transfer Problems in Thermal Protection Systems

Heat Transfer - Models, Methods and Applications, Jun 27, 2018

Thermal protecti.on system (TPS) is one of the most important subsystems of hypersonic vehicles w... more Thermal protecti.on system (TPS) is one of the most important subsystems of hypersonic vehicles which are subjected to severe aerodynamic heating. The reliability and structural integrity of TPS are crucial to the structural safety and integrity of hypersonic aircrafts. During the design and service stages of the TPS, there are numerous inevitable uncertainties in aerothermal environment, material properties, manufacture and assembly errors, analysis modeling errors, etc., which have great impact on the reliability assessment of the TPS. In this chapter, the probabilistic heat transfer for TPS is presented to achieve lightweight TPS with high reliability. The uncertainties and their modeling and sampling methods are introduced at first. Then the finite element model and the precise integration method for transient probabilistic heat transfer of TPS are given. Based on the theoretical and numerical methods, the probabilistic design and reliability assessment procedure for TPS are finally formed. A typical multilayer ceramic composite material TPS is used as example to show the effectiveness of the proposed method.

Research paper thumbnail of Analysis of Morphological Characteristics of Rotating Flow Field Using Proper Orthogonal Decomposition

Journal of Physics: Conference Series, Jul 1, 2018

Research paper thumbnail of Critical role of surficial activity in the sintering process of TiO2 nanoparticles by molecular dynamics simulation

Research paper thumbnail of A Nonintrusive Parametrized Reduced-Order Model for Periodic Flows Based on Extended Proper Orthogonal Decomposition

International Journal of Computational Methods, 2021

The periodic flows, such as vortex shedding and rotating flow in turbomachinery, are very common ... more The periodic flows, such as vortex shedding and rotating flow in turbomachinery, are very common in both scientific and engineering fields. However, high-fidelity numerical simulations of unsteady flows are usually time-consuming, particularly when varying flow parameters need to be considered. In this paper, a novel nonintrusive parametrized reduced order model (PROM) approach for prediction of periodic flows is presented. The establishment of this ROM is based on two techniques, proper orthogonal decomposition (POD) and discrete Fourier transform (DFT), where the first one can extract the spatial features and the second has the ability to quantify the temporal effects of parameters. A prediction model based on artificial neural networks (ANNs) is used to map the flow parameters with DFT coefficients. Flows past a cylinder and two dimensions turbine flows are used to demonstrate the effectiveness of the proposed PROM. It is shown that the proposed POD-DFT-ANN (PDA) ROM are both eff...

Research paper thumbnail of Investigation of Probabilistic Design Method for Multi-layer Thermal Protection System

Research paper thumbnail of Ultrathin, Compacted Gel Polymer Electrolytes Enable High‐Energy and Stable‐Cycling 4 V Lithium‐Metal Batteries

Research paper thumbnail of Solvothermal synthesis of three-dimensional petaloid garnet electrolyte and its application in solid polymer electrolytes

Energy Storage Science and Technology, 2021

Research paper thumbnail of Analysis of Modal Characteristics and Reconstructions of Rotating Flow Field Using POD Method

The discrete POD method is used to analyze the rotating flow to further understand and accurately... more The discrete POD method is used to analyze the rotating flow to further understand and accurately model the details of the flow physics in this paper. The low-order flow modes are obtained using modified discrete POD method proposed by Sirovich, and are used for the reconstruction of the unsteady flow field. The unsteady rotational flow of a simplified impeller is used as numerical example to show the effectiveness of the POD method for the analysis of rotating flow. The numerical results show that the maximal reconstruction deviation is reduced to a very low level with a small increase in the number of low order modes. Furthermore, the regions at relatively high values of deviation shrink distinctly to impeller tip nearby in more accurate approximations.

Research paper thumbnail of Development of 3 D CFD solver based on gradient smoothing method *

Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, ... more Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, and we have smoothed finite element method (S-FEM) for solid mechanics [1-3] and GSM-CFD for fluid mechanics . Theories and numerical examples have demonstrated that the GSM-CFD solver is accurate, efficient, robust, and insensitive to mesh distortions. However, the previous research of GSM-CFD mainly focused on 2D cases, thus the 3D version GSM-CFD solver need to be developed to extend the applicability of the new CFD solver. During the development process, the method for the construction of smoothing domains (SDs) on 3D complex grids is firstly proposed, and the general data structure for SD is also devised. Then the algorithms for gradient approximation of flow variables in 3D domains are also developed, and the approximation accuracy is verified using manufactured solutions. The convective and viscous fluxes of Navier-Stokes equations are also discretized using GSM, and the 3D GSM-CF...

Research paper thumbnail of Keynote: Application of Agglomeration Multigrid Method in GSM-CFD Solver

GSM-CFD is a newly developed CFD solver for general compressible and incompressible problems. The... more GSM-CFD is a newly developed CFD solver for general compressible and incompressible problems. The first- and second order derivatives for flow variables are approximated using gradient smoothing operation, which is more robust to mesh distortion. Extensive applications have shown that the GSM-CFD solver is a competitive alternative to the convention finite volume method. In this research, the agglomeration multigrid method is incorporated to the GSM-CFD solver to further improve the numerical efficiency. The gradients at nodes of irregular agglomerated coarse mesh are also approximated on newly constructed node-based gradient smoothing domains. The transonic NACA 0012 airfoil is used as the numerical example to show the effectiveness of the proposed method.

Research paper thumbnail of Keynote: Development 3D CFD solver based on gradient smoothing method

Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, ... more Gradient smoothing method (GSM) has been widely applied to solve partial differential equations, and we have smoothed finite element method (S-FEM) for solid mechanics and GSM-CFD for fluid mechanics. Theories and numerical examples have demonstrated that the GSM-CFD solver is accurate, efficient, robust, and insensitive to mesh distortions. However, the previous research of GSM-CFD mainly focused on 2D cases, thus the 3D version GSM-CFD solver will be developed here. First, the method for construction of smoothing domains (SDs) on 3D complex grids will be proposed, and the general data structure for SD will be devised. Then the algorithms for gradient approximation of flow field variables in 3D solution domains will be developed and verified. The Navier-Stokes equations will be discretized using GSM, and the 3D GSM-CFD solver is finally formed. The validation and verification of the proposed GSM-CFD solver will be carried out using the method of manufactured solutions, and the resu...

Research paper thumbnail of Hybrid poly-ether/carbonate ester electrolyte engineering enables high oxidative stability for quasi-solid-state lithium metal batteries

Research paper thumbnail of Synthesis and properties of poly(1,3-dioxolane) in situ quasi-solid-state electrolytes via a rare-earth triflate catalyst

Chemical Communications

Quasi-solid-state polymer electrolytes in situ initiated by abundant rare-earth triflate catalyst... more Quasi-solid-state polymer electrolytes in situ initiated by abundant rare-earth triflate catalysts will produce intimate electrolyte/electrodes interfaces and enable lithium metal anodes.

Research paper thumbnail of A facile method for the synthesis of a sintering dense nano-grained Na3Zr2Si2PO12 Na+-ion solid-state electrolyte

Chemical Communications

We report dense Na3Zr2Si2PO12 with an average grain size of 546 ± 58 nm and prepared by a facile ... more We report dense Na3Zr2Si2PO12 with an average grain size of 546 ± 58 nm and prepared by a facile method.

Research paper thumbnail of Ultrathin, dense, hybrid polymer/ceramic gel electrolyte for high energy lithium metal batteries

Research paper thumbnail of A composite electrolyte with Na3Zr2Si2PO12 microtube for solid-state sodium-metal batteries

Research paper thumbnail of Probabilistic Transient Heat Conduction Analysis Considering Uncertainties in Thermal Loads Using Surrogate Model

Journal of Spacecraft and Rockets

Thermal protection system (TPS) is one of the most important subsystems for vehicle reentry. Beca... more Thermal protection system (TPS) is one of the most important subsystems for vehicle reentry. Because of the uncertainties in thermal loads, material properties, and manufacture tolerances, the ther...

Research paper thumbnail of Mechanical properties and thickness-determined fracture mode of hexagonal boron nitride nanosheets under nanoindentation simulations

Computational Materials Science

Research paper thumbnail of Spider-Inspired Ultrasensitive Flexible Vibration Sensor for Multifunctional Sensing

Flexible vibration sensor can not only capture broad classes of physiologically relevant informat... more Flexible vibration sensor can not only capture broad classes of physiologically relevant information, including mechano-vibration signatures of body processes and precision kinematics of core-body motions, but also detect environmental seismic wave, providing early warning to wearer in time. Spider is one of the most vibration-sensitive creatures due to its hair-like sensilla and lyriform slit structure. Here a spider-inspired highly sensitive flexible vibration sensor is designed and fabricated for multifunctional sensing. The vibration sensitivity of the flexible sensor is increased over two orders of magnitude from 0.006 to 0.5 mV/g and the strain sensitivity is hugely enhanced from 0.08 to 150 compared to a plain sensor counterpart. It is shown that the synergistic effect of cilium arrays and cracks is the key for achieving the greatly enhanced vibration and strain sensitivity. The dynamic sensitivity of 0.5 mV/g outperforms the corresponding commercial sensors. The flexible sensor is demonstrated to be generally feasible for detecting vibration signals caused by walk, tumble and explosion as well as capturing human body motions, indicating its great potential for applications in human health monitoring devices, posture control of robotics and early earthquake warning, etc.

Research paper thumbnail of Numerical Study of Flame Propagation Morphology for Deflagration in the Pipeline Using Proper Orthogonal Decomposition

Advances in Civil Engineering

A multilevel independent spatial modal analysis of flame propagation characteristics of a deflagr... more A multilevel independent spatial modal analysis of flame propagation characteristics of a deflagration in a specific pipeline was performed using the proper orthogonal decomposition (POD) method, in order to research the evolution process of the explosion which is closely related to flame propagation speed and front rupture pressure. The CFD results indicated that the full-order calculation results well agreed with the normal combustion propagation characteristics of premixed methane-air for the flame propagation with the unbroken thin layer. The POD analysis results showed that the static temperature gradient of the 1st order mode of initial and subsequent stages both exhibited a range of continuity change from left to right, and the frontal curvature of the cooling area decreased as the flame propagated in all stages. The number of the low-temperature interval regions displayed an expanding form of a staircase with the increase of the mode order, especially for subsequent flame in...

Research paper thumbnail of Probabilistic Heat Transfer Problems in Thermal Protection Systems

Heat Transfer - Models, Methods and Applications, Jun 27, 2018

Thermal protecti.on system (TPS) is one of the most important subsystems of hypersonic vehicles w... more Thermal protecti.on system (TPS) is one of the most important subsystems of hypersonic vehicles which are subjected to severe aerodynamic heating. The reliability and structural integrity of TPS are crucial to the structural safety and integrity of hypersonic aircrafts. During the design and service stages of the TPS, there are numerous inevitable uncertainties in aerothermal environment, material properties, manufacture and assembly errors, analysis modeling errors, etc., which have great impact on the reliability assessment of the TPS. In this chapter, the probabilistic heat transfer for TPS is presented to achieve lightweight TPS with high reliability. The uncertainties and their modeling and sampling methods are introduced at first. Then the finite element model and the precise integration method for transient probabilistic heat transfer of TPS are given. Based on the theoretical and numerical methods, the probabilistic design and reliability assessment procedure for TPS are finally formed. A typical multilayer ceramic composite material TPS is used as example to show the effectiveness of the proposed method.

Research paper thumbnail of Analysis of Morphological Characteristics of Rotating Flow Field Using Proper Orthogonal Decomposition

Journal of Physics: Conference Series, Jul 1, 2018