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Li Hua


LI Hua
Associate Professor
Tel: 6790 4953
Email: lihua@ntu.edu.sg
Office: N3-02c-79 
Homepage: http://www.ntu.edu.sg/home/LiHua/
   
Education
  • PhD National University of Singapore 1999
  • ME Wuhan University of Technology 1987
  • BS Wuhan University of Technology 1982

Biography
Dr. Li Hua received his B.Sc and M.Eng degrees in Engineering Mechanics from Wuhan University of Technology, P.R.C., in 1982 and 1987, respectively. He obtained his Ph.D degree in Mechanical Engineering from the National University of Singapore in 1999. From 2000 to 2001, Dr. Li was a Postdoctoral Associate at the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign. At the end of 2005, he was a Visiting Scientist on invitation at the Department of Chemical and Biomolecular Engineering in Johns Hopkins University. From 2001 to 2006, he was a Research Scientist in the A*STAR Institute of High Performance Computing. Dr Li joined NTU as an Assistant Professor in June 2006 and he was promoted to Associate Professor in March 2013. He is currently in the School of Mechanical & Aerospace Engineering at NTU. His research interests include the multiphysics modelling of soft matters (smart hydrogel in BioMEMS and biological cell in microscale fields); development of highly efficient numerical computational methodology (meshless & multiscale algorithms); simulation of sustainable energy (building energy efficiency and fuel cell system); and structural dynamics (high-speed rotating shell and composite materials structure). He has sole-authored a monograph book entitled “Smart Hydrogel Modelling” published by Springer, co-authored two monograph books entitled “Meshless Methods and Their Numerical Properties” by CRC Press and “Rotating Shell Dynamics” by Elsevier, and 2 book chapters, one on MEMS simulation and the other on hydrogel drug delivery system modelling, and authored/co-authored over a hundred articles published in peer-reviewed international journals. He received the Silver Award in HPC Quest 2003 - The Blue Challenge presented by IBM & IHPC in 2003. He is also extensively funded by agencies, including the principal investigator of a computational BioMEMS project awarded under A*STAR’s strategic research programme in MEMS, and by industries, including SUN Microsystems (Oracle), Sony, Philips, DSO and JTC.

Research
  • Interest:
    Multiphysics modeling of soft matters – Smart hydrogel in BioMEMS & Biological cell in microscale fields, Development of highly efficient numerical computational methodology – Meshless & Multiscale algorithms, Simulation of sustainable energy – Building energy efficiency & Fuel cell system and Structural dynamics – High-speed rotating shell & Composite materials structure.
  • Projects:
    Multiphysics Modeling of Smart Hydrogel in BioMEMS
    So far the six multiphysics models have been developed theoretically for simulation of the fundamental mechanism and performance of the smart hydrogels responsive to the six kinds of external stimuli in environment solutions respectively. They include (1) solution pH, (2) externally applied electric field, (3) pH coupled with electric field, (4) temperature, (5) glucose/carbohydrates, and (6) salt concentration/ionic strength. All the six models are based on the laws of mass and momentum conservations, and include the effects of multiphases (the 3-D solid polymeric matrix network, interstitial fluid and ion species) simultaneously and chemo-electro-mechanical coupled multi-fields. Computational domains are defined as covering both the smart hydrogel and surrounding solution, in which the moving interfaces between the hydrogel and solution are modeled approximately and the boundary conditions are imposed on solution edges. The work has been extended to transient simulation of controlled drug release from micro-hydrogel particles.
    [Micro-Systems Laboratory, Biomedical & Sports]
    Multiphysics Modeling of Moving Deformable Cells in Microscale Hydrodynamic and/or Electric Fields
    A two-fluid model is developed for flow characteristics of cell suspending in a fluid, considering the interaction between cell and hydrodynamic field, identified by the membrane mechanical force, in which the cell membrane is treated as an incompressible and elastic shell with a uniform thickness and allowed to undergo the stretching and bending deformation; the interaction between the cell and electric field, identified by the dielectrophoresis (DEP) force due to the cell polarization through the Maxwell stress tensor (MST) approach; and the interaction between the two cells, identified by the intercellular interaction force behaving as a weak attractive force at far distance but a strong repulsive force at near distance through the Morse potential model.
    [Micro-Systems Laboratory, Biomedical & Sports]
    Development of High-Efficiency Numerical Computational Methods (Meshless and Multiscale Algorithms)
    So far the eight novel meshless methods have been developed in both strong- and weak-forms. They have been validated numerically and are able to very efficiently solve differential or integral equations approximately with controllable computational accuracy. Six of them are in the strong form, termed the random integral quadrature (RIQ) method, the random differential quadrature (RDQ) method, the Hermite-cloud method (MCM), the point weighted least-squares (PWLS) method, the hybrid meshless-differential order reduction (hM-DOR) method, and the meshless finite mixture (MFM) method. The other two are in the weak form, called the local Kriging (LoKriging) method, and the variation of local point interpolation method (vLPIM). They have been presented systematically in a monograph book, entitled Meshless Methods and Their Numerical Properties published by CRC PRESS in 2013, focusing on their numerical properties including the convergence, consistency, stability, and adaptivity. Their applications in MEMS modeling have been summarized and published in 2006 in the form of “Chapter: Techniques for Efficient Analytical and Simulation Methods in the Prototyping of MEMS Systems”, in “MEMS/NEMS Handbook: Techniques and Applications”, Cornelius T. Leondes (ed.), Kluwer Academic Publishers, Norwell, MA.
    [Computer Aided Engineering Laboratory, Mechanics]
    Simulation of Sustainable Energy for Building Energy Efficiency
    The present research work aims to analyze and optimize the thermal performance of ventilated roofs in tropical climate, and minimize the heat flux transferred across the roofs with different inclination angles and geometries, materials as well as ventilation modes, via (1) a field experiment and modeling analysis for the thermal performance of a flat roof subjected to the tropical climate in Singapore; (2) development of a novel model with experimental validation for the fast and accurate estimation of the heat flux transferred across the naturally-ventilated inclined roof with finite/infinite width-to-height ratios; and (3) the theoretical and experimental studies of the thermal performance of forced-ventilated roofs.
    [Energy Systems Laboratory, Thermo-Fluid & Energy]
    Simulation of Sustainable Energy for Fuel Cell System
    The present research work aims to develop various novel reduced models for the cell and stack equipped with parallel plain flow channels to significantly reduce computational cost with desired numerical accuracy, while capturing both the average properties and the variability of the dependent variables in the 3D model. The model reduction is performed based on full 3D cell model for conservation of mass, momentum, species, charge and energy, and is validated with experiments.
    [Fuel Cell Laboratory, Thermo-Fluid & Energy]
    Dynamics of High-Speed Rotating Shells of Composite Materials
    So far the dynamic characteristics of the three (cylindrical, conical and spherical) revolution rotating shells have been studied, especially focusing on the influences of Coriolis and centrifugal accelerations, rotating velocity, geometric and material properties, boundary conditions, initial stresses, and modal wave numbers.
    [Aerospace Structures Laboratory, Aerospace Engineering]

Research Staff and Students under supervision

Research Staff
Name Title Email
Hua Haobo Research Fellow HBHUA@ntu.edu.sg
Lyu Xujian Research Fellow XJLYU@ntu.edu.sg
Zhang Jun Research Fellow JUN.ZHANG@ntu.edu.sg
Zhou Xiaoli Research Associate XIAOLI@ntu.edu.sg

PhD Students
Name Project
Huynh Nam Khoa Development of A Visual Tool for Analysis of Overall Performance of HVAC System for Indoor Environment Control
Tong Shanshan Thermal Performance of Ventilated Roofs in Tropical Climate
Zhou Xiaoli Real-Time Control for Motional Inlets in HVAC System
Teng Long Advanced Control for Multi-input Multi-output Industrial Systems
Jiang Chaoyang Assessment and Visualization of HVAC System Design
Goh Kek Boon Development of a multiphysics model for simulation of enzyme-sensitive hydrogel
Wu Tao Development of Novel Models for Analysis of Soft Hydrophilic Materials in Aqueous Environment
Liu Qimin Investigation of fracture behavior of high-performance material placed in fluid subject to high temperature and high pressure
Hu Huanlong Application of Graphene-based materials as skirting for corneal inlay and artificial cornea

Master Students
Name Project
Hong Jiahua Dynamics of Non-Newtonian Two-phase Fluid Interface in Thermal Environment
Yang Songyuan Effect of Temperature on the Dynamics of Two-phase Fluid Interface

Selected Publications
  • Zhongjie He, Hua Li, and E. Birgersson, Correlating variability of modeling parameters with non-isothermal stack performance: Monte Carlo simulation of a portable 3D planar solid oxide fuel cell stack, Applied Energy, 136, 560–575, 2014.
  • Hua Li, Free vibration of a high-speed rotating truncated spherical shell, ASME Journal of Vibration and Acoustics, 135(3), 031006-(1~14), 2013.
  • Ting Ye, Hua Li and K.Y. Lam, Numerical design of microfluidic-microelectric hybrid chip for the separation of biological cells, Langmuir, 27(6), 3188–3197, 2011.
  • Ting Ye, Hua Li and K.Y. Lam, Motion, deformation and aggregation of two cells in a microchannel by dielectrophoresis, Electrophoresis, 32(22), 3147–3156, 2011.
  • Fukun Lai and Hua Li, Modeling of effect of initial fixed charge density on smart hydrogel response to ionic strength of environmental solution, Soft Matter, 6(2), 311–320, 2010.
  • Hua Li and Gang Ma, Modeling performance of a two-dimensional capsule in a microchannel flow: Long-term lateral migration, Physical Review E, 82(2), 026304-(1~14), 2010.
  • Hua Li and Fukun Lai, Multiphysics modeling of responsive characteristics of ionic-strength-sensitive hydrogel, Biomedical Microdevices, 12(3), 419–434, 2010.
  • Rongmo Luo, Hua Li and K.Y. Lam, Modeling the effect of environmental solution pH on the mechanical characteristics of glucose-sensitive hydrogels, Biomaterials, 30(4), 690-700, 2009.
  • Hua Li, Rongmo Luo, Erik Birgersson and K.Y. Lam, A chemo-electro-mechanical model for simulation of responsive deformation of glucose-sensitive hydrogels with the effect of enzyme catalysis, Journal of the Mechanics and Physics of Solids, 57(2), 369-382, 2009.
  • Hua Li, Kinetics of smart hydrogels responding to electric field: A transient deformation analysis, International Journal of Solids and Structures, 46(6), 1326-1333, 2009.

Teaching
  • Mechanics Of Materials
  • Work And Energy
  • Finite Element Method
  • Computing
  • Computational Methods In Engineering
  • Mechanical System Design And Analysis
  • Unsymmetric Bending
  • Principle Of Rigid Motion