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Bioinspired integrated triboelectric electronic tongue

Microsystems & Nanoengineering 2024年第3期10卷 97-108页

作者： Jiaming Liu Jingui Qian Murtazt Adil Yali Bi Haoyi Wu Xuefeng Hu Zuankai Wang Wei Zhang Anhui Province Key laboratory of Measuring Theory and Precision Instruments School of Instrumental Science and Optoelectronics EngineeringHefei University of Technology230009 HefeiAnhuiChina School of Physics and Optoelectronic engineering Guangdong University of Technology510006 GuangzhouGuangdongChina Department of Mechanical engineering The Hong Kong Polytechnical UniversityHong Kong SARChina

An electronic tongue(E-tongue)comprises a series of sensors that simulate human perception of taste and embedded artificial intelligence(AI)for data analysis and *** E-tongues based on electrochemical methods suffer from a bulky size and require larger sample volumes and extra power sources,limiting their applications in in vivo medical diagnosis and analytical *** by the mechanics of the human tongue,triboelectric components have been incorporated into E-tongue platforms to overcome these *** this study,an integrated multichannel triboelectric bioinspired E-tongue(TBIET)device was developed on a single glass slide chip to improve the device’s taste classification accuracy by utilizing numerous sensory *** detection capability of the TBIET was further validated using various test samples,including representative human body,environmental,and beverage *** TBIET achieved a remarkably high classification *** instance,chemical solutions showed 100%identification accuracy,environmental samples reached 98.3%accuracy,and four typical teas demonstrated 97.0%***,the classification accuracy of NaCl solutions with five different concentrations reached 96.9%.The innovative TBIET exhibits a remarkable capacity to detect and analyze droplets with ultrahigh sensitivity to their electrical ***,it offers a high degree of reliability in accurately detecting and analyzing various liquid samples within a short *** development of a self-powered portable triboelectric E-tongue prototype is a notable advancement in the field and is one that can greatly enhance the feasibility of rapid on-site detection of liquid samples in various settings.

关键词： electronic utilizing overcome

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Decohesion of graphene from a uniaxially-stretched substrate:Failure analysis of a frictional adhesive interface

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Friction 2024年第3期12卷 510-521页

作者： Bo PENG Chaochen XU Qingao WANG Pei ZHAO Xiqiao FENG Qunyang LI AML Department of Engineering MechanicsTsinghua UniversityBeijing 100084China State Key laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Center for X-mechanics and Institute of Applied mechanics Zhejiang UniversityHangzhou 310027China State Key laboratory of fluid Power and M

Composite structures consisting of two-dimensional(2D)materials deposited on elastic substrates have a wide range of potential applications in flexible *** such devices,robust 2D film/substrate interfacial adhesion is essential for their reliable performance when subjected to external thermal and mechanical *** better understand the strength and failure behavior of the 2D film/substrate interfaces,two types of graphene/polymer samples with distinct interfacial adhesion properties are fabricated and tested by uniaxially stretching the *** on the interfacial adhesion,two drastically different debonding rates are observed,i.e.,rapid snap-through debonding and more progressive crack *** by the experimental observation,we propose an improved shear-lag model with a trapezoidal-shaped cohesive zone to derive an analytical solution for the decohesion *** theoretical model reveals that the decohesion behavior of the frictional adhesive interface is governed by three dimensionless ***,the dimensionless length of the film essentially determines the decohesion rate;while the other two parameters affect the critical substrate strain to initiate *** fitting the experimental data with the theoretical model,the intrinsic adhesion properties of the two samples are obtained with physically meaningful *** work offers an analytical solution to describing the decohesion behavior of general thin film/substrate systems with a frictional adhesive interface,which is beneficial for characterizing and optimizing the mechanical properties of various thin film/polymer devices.

关键词： film/substrate systems adhesion frictional sliding interface decohesion cohesive-zone model

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Constrained large-eddy simulation of laminar-turbulent transition in compressible channel flows

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Advances in Aerodynamics 2023年第1期5卷 229-246页

作者： Sanmu Chen Zhou Jiang Minping Wan Shiyi Chen guangdong Provincial Key laboratory of Turbulence Research and applications Department of Mechanics and Aerospace EngineeringSouthern University of Science and TechnologyShenzhen 518055China guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications Southern University of Science and TechnologyShenzhen 518055China College of Aerospace engineering Chongqing UniversityChongqing 400044China

An improved approach for constrained large-eddy simulations(CLES)of wall-bounded compressible transitional flows is proposed by introducing an intermittency *** improved model is tested and validated with compressible channel flows at various Mach numbers and Reynolds numbers that are transitioning from laminar to turbulent *** improved model is compared against traditional dynamic Smagorinsky model(DSM)and Direct Numerical Simulations(DNS),where the improved model is in better agreement with DNS results than traditional DSM model,in terms of mean velocity profiles,total Reynolds stress and total heat ***,the proposed method can be used to accurately predict the temporal laminar-turbulent transition process of compressible wall-bounded flows.

关键词： Constrained LES Transition prediction Compressible channel flow

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Dynamic nonlinear algebraic models with scale-similarity dynamic procedure for large-eddy simulation of turbulence

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Advances in Aerodynamics 2022年第1期4卷 304-326页

作者： Zelong Yuan Yunpeng Wang Chenyue Xie Jianchun Wang Department of mechanics and Aerospace engineering Southern University of Science and TechnologyShenzhen518055China Southern Marine Science and engineering guangdong laboratory(Guangzhou) Guangzhou511458China guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications Southern University of Science and TechnologyShenzhen518055China Department of Ocean Science The Hong Kong University of Science and TechnologyHong Kong999077China

A dynamic nonlinear algebraic model with scale-similarity dynamic procedure(DNAM-SSD)is proposed for subgrid-scale(SGS)stress in large-eddy simulation of *** model coefficients of the DNAM-SSD model are adaptively calculated through the scale-similarity relation,which greatly simplifies the conventional Germano-identity based dynamic procedure(GID).The a priori study shows that the DNAM-SSD model predicts the SGS stress considerably better than the conventional velocity gradient model(VGM),dynamic Smagorinsky model(DSM),dynamic mixed model(DMM)and DNAM-GID model at a variety of filter widths ranging from inertial to viscous *** correlation coefficients of the SGS stress predicted by the DNAM-SSD model can be larger than 95%with the relative errors lower than 30%.In the a posteriori testings of LES,the DNAM-SSD model outperforms the implicit LES(ILES),DSM,DMM and DNAM-GID models without increasing computational costs,which only takes up half the time of the DNAM-GID *** DNAM-SSD model accurately predicts plenty of turbulent statistics and instantaneous spatial structures in reasonable agreement with the filtered DNS *** results indicate that the current DNAM-SSD model is attractive for the development of highly accurate SGS models for LES of turbulence.

关键词： Subgrid-scale model Nonlinear algebraic model Large-eddy simulation Incompressible turbulence

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An SAV Method for Imaginary Time Gradient Flow Model in Density Functional Theory

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Advances in Applied Mathematics and mechanics 2023年第3期15卷 719-736页

作者： Ting Wang Jie Zhou Guanghui Hu Department of Mathematics Faculty of Science and TechnologyUniversity of MacaoMacao SARChina School of Mathematics and Computational Science Xiangtan UniversityXiangtanHunan 411105China Zhuhai UM Science&Technology Research Institute ZhuhaiGuangdong 519030China guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications University of MacaoMacao SARChina

In this paper,based on the imaginary time gradient flow model in the density functional theory,a scalar auxiliary variable(SAV)method is developed for the ground state calculation of a given electronic structure *** handle the orthonormality constraint on those wave functions,two kinds of penalty terms are introduced in designing the modified energy functional in SAV,i.e.,one for the norm preserving of each wave function,another for the orthogonality between each pair of different wave functions.A numerical method consisting of a designed scheme and a linear finite element method is used for the ***,the desired unconditional decay of modified energy can be obtained from our method,while computationally,both the original energy and modified energy decay behaviors can be observed successfully from a number of numerical *** importantly,numerical results show that the orthonormality among those wave functions can be automatically preserved,without explicitly preserving orthogonalization *** implies the potential of our method in large-scale simulations in density functional theory.

关键词： Density functional theory gradient flow scalar auxiliary variable unconditional energy stability orthonormalization free

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General Synthetic Iterative Scheme for Unsteady Rarefied Gas Flows

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Communications in Computational Physics 2023年第6期33卷 173-207页

作者： Jianan Zeng Wei Su Lei Wu Department of mechanics and Aerospace engineering Southern University of Science and TechnologyShenzhen 518055China Division of Emerging Interdisciplinary Areas The Hong Kong University of Science and TechnologyClear Water BayHong KongChina Department ofMathematics The Hong Kong University of Science and TechnologyClear Water BayHong KongChina guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications Southern University of Science and TechnologyShenzhen 518055China

In rarefied gas flows,the spatial grid size could vary by several orders of magnitude in a single flow configuration(e.g.,inside the Knudsen layer it is at the order of mean free path of gas molecules,while in the bulk region it is at a much larger hydrodynamic scale).Therefore,efficient implicit numerical method is urgently needed for time-dependent ***,the integro-differential nature of gas kinetic equations poses a grand challenge,as the gain part of the collision operator is *** an iterative solver is required in each time step,which usually takes a lot of iterations in the(near)continuum flow regime where the Knudsen number is small;worse still,the solution does not asymptotically preserve the fluid dynamic limit when the spatial cell size is not refined *** on the general synthetic iteration scheme for steady-state solution of the Boltzmann equation,we propose two numerical schemes to push the multiscale simulation of unsteady rarefied gas flows to a new boundary,that is,the numerical solution not only converges within dozens of iterations in each time step,but also asymptotically preserves the Navier-Stokes-Fourier limit in the continuum flow regime,when the spatial grid is coarse,and the time step is large(e.g.,in simulating the extreme slow decay of two-dimensional Taylor vortex,the time step is even at the order of vortex decay time).The properties of fast convergence and asymptotic preserving of the proposed schemes are not only rigorously proven by the Fourier stability analysis for simplified gas kinetic models,but also demonstrated by several numerical examples for the gas kinetic models and the Boltzmann equation.

关键词： Unsteady rarefied gas flow general synthetic iterative scheme fast convergence asymptotic Navier-Stokes preserving

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High-Order Unified Gas-kinetic Scheme

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Communications in Computational Physics 2022年第9期32卷 951-979页

作者： Gyuha Lim Yajun Zhu Kun Xu Department of Mechanical and Aerospace engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Mathematics The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications Hong Kong University of Science and TechnologyHong KongChina Shenzhen Research Institute Hong Kong University of Science and TechnologyShenzhenChina

In this paper,we present a high-order unified gas-kinetic scheme(UGKS)using the weighted essentially non-oscillatory with adaptive-order(WENO-AO)method for spatial reconstruction and the two-stage fourth-order scheme for time *** the UGKS updates both the macroscopic flow variables and microscopic distribution function,and provides an adaptive flux function by combining the equilibrium and non-equilibrium parts,it is possible to take separate treatment of the equilibrium and non-equilibrium calculation in the UGKS for the development of highorder *** the fact that high-order techniques are commonly applied in the continuum flow simulation with complex structures,and that the rarefied flow structure is usually smooth in the physical space,we apply the high-order techniques in the equilibrium part of the UGKS for the capturing of macroscopic flow evolution,and retain the calculation of distribution function as a second-order method,so that a balance of computational cost and numerical accuracy could be well *** HUGKS has been validated by several numerical test cases,including sine-wave accuracy test,Sod-shock tube,Couette,oscillating Couette,lid-driven cavity and oscillating cavity *** is shown that the current method preserves the multiscale property of the original UGKS and obtains accurate solutions in the near continuum regimes.

关键词： High-order reconstruction two-stage fourth-order scheme WENO-AO micro flow

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A Convergence Analysis of a Structure-Preserving Gradient Flow Method for the All-Electron Kohn-Sham Model

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Numerical Mathematics(Theory,Methods and applications) 2023年第3期16卷 597-621页

作者： Yedan Shen Ting Wang Jie Zhou Guanghui Hu School of Mathematics and Information Science Guangzhou UniversityGuangzhouChina Faculty of Science and Technology University of MacaoMacao SARChina Hunan Key laboratory for Computation and Simulation in Science and engineering Xiangtan UniversityXiangtanChina School of Mathematical Computational Sciences Xiangtan UniversityXiangtanChina Zhuhai UM Science&Technology Research Institute ZhuhaiChina guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications University of MacaoMacao SARChina

In[Dai et al.,***.18(4)(2020)],a structure-preserving gradient flow method was proposed for the ground state calculation in Kohn-Sham density functional theory,based on which a linearized method was developed in[Hu et al.,EAJAM.13(2)(2023)]for further improving the numerical *** this paper,a complete convergence analysis is delivered for such a linearized method for the all-electron Kohn-Sham ***,the convergence,the asymptotic stability,as well as the structure-preserving property of the linearized numerical scheme in the method is discussed following previous works,while spatially,the convergence of the h-adaptive mesh method is demonstrated following[Chen et al.,***.12(2014)],with a key study on the boundedness of the Kohn-Sham potential for the all-electron Kohn-Sham *** examples confirm the theoretical results very well.

关键词： Kohn-Sham density functional theory gradient flow model structure-preserving linear scheme convergence analysis

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ANURBS-Enhanced Finite Volume Method for Steady Euler Equations with Goal-Oriented h-Adaptivity

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Communications in Computational Physics 2022年第7期32卷 490-523页

作者： Xucheng Meng Guanghui Hu Research Center for Mathematics Beijing Normal UniversityZhuhai 519087China BNU-HKBU United International College Zhuhai 519087China Department of Mathematics University of MacaoMacao SARChina ZhuhaiUMScience and Technology Research Institute ZhuhaiGuangdong ProvinceChina guangdong-hong kong-macao joint laboratory for data-driven fluid Dynamics and engineering applications University of MacaoMacao SARChina

In[A NURBS-enhanced finite volume solver for steady Euler equations,***,***,***.,Vol.359,pp.77–92],aNURBS-enhanced finite volume method was developed to solve the steady Euler equations,in which the desired high order numerical accuracy was obtained for the equations imposed in the domain with a curved *** this paper,the method is significantly improved in the following ways:(i)a simple and efficient point inversion technique is designed to compute the parameter values of points lying on a NURBS curve,(ii)with this new point inversion technique,the h-adaptive NURBS-enhanced finite volume method is introduced for the steady Euler equations in a complex domain,and(iii)a goal-oriented a posteriori error indicator is designed to further improve the efficiency of the algorithm towards accurately calculating a given quantity of *** results obtained from a variety of numerical experiments with different flow configurations successfully show the effectiveness and robustness of the proposed method.

关键词： Steady Euler equations NURBS-enhanced finite volume method goal-oriented a posteriori error estimation non-oscillatory k-exact reconstruction point inversion

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Unified Gas-Kinetic Wave-Particle Methods VI:Disperse Dilute Gas-Particle Multiphase Flow

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Communications in Computational Physics 2022年第3期31卷 669-706页

作者： Xiaojian Yang Chang Liu Xing Ji Wei Shyy Kun Xu Department of Mechanical and Aerospace engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Institute of Applied Physics and Computational Mathematics BeijingChina Department of Mathematics Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina guangdong-hong kong-macao joint laboratory for data-driven fluid mechanics and engineering applications Hong Kong University of Science and TechnologyHong KongChina Shenzhen Research Institute Hong Kong University of Science and TechnologyShenzhenChina

A coupled gas-kinetic scheme(GKS)and unified gas-kinetic wave-particle(UGKWP)method for the disperse dilute gas-particle multiphaseflow is *** the two-phaseflow,the gas phase is always in the hydrodynamic regime and is fol-lowed by GKS for the Navier-Stokes *** particle phase is solved by UGKWP in all regimes from particle trajectory crossing to the hydrodynamic wave interac-tion with the variation of particle’s Knudsen *** the intensive particle colli-sion regime,the UGKWP gives a hydrodynamic wave representation for the particle phase and the GKS-UGKWP for the two-phaseflow reduces to the two-fluid Eulerian-Eulerian(EE)*** the rarefied regime,the UGKWP tracks individual particle and the GKS-UGKWP goes back to the Eulerian-Lagrangian(EL)*** the tran-sition regime for the solid particle,the GKS-UGKWP takes an optimal choice for the wave and particle decomposition for the solid particle phase and connects the EE and EL methods *** GKS-UGKWP method will be tested in allflow regimes with a large variation of Knudsen number for the solid particle transport and Stokes number for the two-phase *** is confirmed that GKS-UGKWP is an efficient and accurate multiscale method for the gas-particle two-phaseflow.

关键词： Unified gas-kinetic wave-particle method gas-kinetic scheme disperse gas-particle two-phaseflow.

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