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| 1 | Flow structures of gaseous jets injected into water for underwater propulsion显示文摘Gaseous jets injected into water are typically found in underwater propulsion,and the flow is essentially unsteady and turbulent.Additionally,the high water-to-gas density ratio can result in complicated flow structures;hence measuring the flow structures numerically and experimentally remains a challenge.To investigate the performance of the underwater propulsion,this paper uses detailed Navier-Stokes flow computations to elucidate the gas-water interactions under the framework of the volume of fluid(VOF) model.Furthermore,these computations take the fluid compressibility,viscosity,and energy transfer into consideration.This paper compares the numerical results and experimental data,showing that phenomena including expansion,bulge,necking/breaking,and back-attack are highlighted in the jet process.The resulting analysis indicates that the pressure difference on the rear and front surfaces of the propulsion system can generate an additional thrust.The strong and oscillatory thrust of the underwater propulsion system is caused by the intermittent pulses of the back pressure and the nozzle exit pressure.As a result,the total thrust in underwater propulsion is not only determined by the nozzle geometry but also by the flow structures and associated pressure distributions. | Jia-Ning Tang Ning-Fei Wang Wei Shyy | 2011 | Acta Mechanica Sinica2011，27，4： | 31 |
| 2 | Lattice Boltzmann modeling of transport phenomena in fuel cells and flow batteries显示文摘Fuel cells and flow batteries are promising technologies to address climate change and air pollution problems. An understanding of the complex multiscale and multiphysics transport phenomena occurring in these electrochemical systems requires powerful numerical tools. Over the past decades, the lattice Boltzmann(LB) method has attracted broad interest in the computational fluid dynamics and the numerical heat transfer communities, primarily due to its kinetic nature making it appropriate for modeling complex multiphase transport phenomena. More importantly, the LB method fits well with parallel computing due to its locality feature, which is required for large-scale engineering applications. In this article, we review the LB method for gas–liquid two-phase flows, coupled fluid flow and mass transport in porous media, and particulate flows. Examples of applications are provided in fuel cells and flow batteries. Further developments of the LB method are also outlined. | Ao Xu Wei Shyy Tianshou Zhao | 2017 | Acta Mechanica Sinica2017，33，3： | 12 |
| 3 | Modeling of turbulent,isothermal and cryogenic cavitation under attached conditions显示文摘当液体压力是比以一个本地热力学的国家的蒸汽压力低的时,成穴经常被触发。现在的文章考察向在等温、低温实验法的条件下面为成穴预言发展当模特儿和计算策略取得的最近的进步,与依附的洞上的一个重音。评论沿着平均 Reynolds 的 Navier 鈥揝t okes 考虑其他的成穴模型,很, lager 旋涡模拟骚乱来临保证计算工具能处理设计兴趣的流动。观察与当模特儿和试验性的信息联系的实质的无常,代理人建模策略被考察估计含意和各种各样的建模和材料参数的相对重要性。在在影响下面的静态、动态的压力之间的交换粘滞效果能在一个稳固的目标的有效形状上有显著影响,它能影响成穴结构。关于蒸发和冷凝作用动力学的热效果被检验使与低温实验法的成穴联系的液体物理清楚些。为技术建模的代理人在为敏感评价建模的上下文被加亮。关键词成穴 - 低温实验法的液体 - 热效果 - 骚乱模型 - | Chien-Chou Tseng Yingjie Wei GuoyuWang Wei Shyy | 2010 | Acta Mechanica Sinica2010，26，3： | 11 |
| 4 | Micro air vehicle-motivated computational biomechanics in bio-flights:aerodynamics,flight dynamics and maneuvering stability显示文摘Aiming at developing an effective tool to unveil key mechanisms in bio-flight as well as to provide guidelines for bio-inspired micro air vehicles(MAVs) design,we propose a comprehensive computational framework,which integrates aerodynamics,flight dynamics,vehicle stability and maneuverability.This framework consists of(1) a Navier-Stokes unsteady aerodynamic model;(2) a linear finite element model for structural dynamics;(3) a fluidstructure interaction(FSI) model for coupled flexible wing aerodynamics aeroelasticity;(4) a free-flying rigid body dynamic(RBD) model utilizing the Newtonian-Euler equations of 6DoF motion;and(5) flight simulator accounting for realistic wing-body morphology,flapping-wing and body kinematics,and a coupling model accounting for the nonlinear 6DoF flight dynamics and stability of insect flapping flight.Results are presented based on hovering aerodynamics with rigid and flexible wings of hawkmoth and fruitfly.The present approach can support systematic analyses of bio- and bio-inspired flight. | Hao Liu Toshiyuki Nakata Na Gao Masateru Maeda Hikaru Aono Wei Shyy | 2010 | Acta Mechanica Sinica2010，26，6： | 8 |
| 5 | Multiphase fluid dynamics and transport processes of low capillary number cavitating flows显示文摘To better understand the multiphase fluiddynamics and associated transport processes of cavitatingflows at the capillary number of 0.74 and 0.54,and to validatethe numerical results,a combined computational and exper-imental investigation of flows around a hydrofoil is stud-ied based on flow visualizations and time-resolved interfacemovement.The computational model is based on a mod-ified RNG k-ε model as turbulence closure,along with avapor-liquid mass transfer model for treating the cavitationprocess.Overall,favorable agreement between the numericaland experimental results is observed.It is shown that the cavi-tation structure depends on the interaction of the water-vapormixture and the vapor among the whole cavitation stage,the interface between the vapor and the two-phase mixtureexhibits substantial unsteadiness.And,the adverse motionof the interface relates to pressure and velocity fluctuationsinside the cavity.In particular,the velocity in the vapor regionis lower than that in the two-phase region. | Xiangbin Li Guoyu Wang Zhiyi Yu Wei Shyy | 2009 | Acta Mechanica Sinica2009，25，2： | 6 |
| 6 | Surrogate-based modeling and dimension reduction techniques for multi-scale mechanics problems显示文摘Successful modeling and/or design of engineering systems often requires one to address the impact of multiple 'design variables' on the prescribed outcome.There are often multiple,competing objectives based on which we assess the outcome of optimization.Since accurate,high fidelity models are typically time consuming and computationally expensive,comprehensive evaluations can be conducted only if an efficient framework is available.Furthermore,informed decisions of the model/hardware's overall performance rely on an adequate understanding of the global,not local,sensitivity of the individual design variables on the objectives.The surrogate-based approach,which involves approximating the objectives as continuous functions of design variables from limited data,offers a rational framework to reduce the number of important input variables,i.e.,the dimension of a design or modeling space.In this paper,we review the fundamental issues that arise in surrogate-based analysis and optimization,highlighting concepts,methods,techniques,as well as modeling implications for mechanics problems.To aid the discussions of the issues involved,we summarize recent efforts in investigating cryogenic cavitating flows,active flow control based on dielectric barrier discharge concepts,and lithium(Li)-ion batteries.It is also stressed that many multi-scale mechanics problems can naturally benefit from the surrogate approach for 'scale bridging.' | Wei Shyy Young-Chang Cho Wenbo Du Amit Gupta Chien-Chou Tseng Ann Marie Sastry | 2011 | Acta Mechanica Sinica2011，27，6： | 4 |
| 7 | A novel energy storage system incorporating electrically rechargeable liquid fuels as the storage medium显示文摘We propose a novel concept of energy storage that incorporates electrically rechargeable liquid fuels made of electroactive species, known as e-fuels, as the storage medium. This e-fuel energy storage system comprises an e-fuel charger and an e-fuel cell. The e-fuel charger electrically charges e-fuels, while the efuel cell subsequently generates electricity using charged e-fuels whenever and wherever on demand.The e-fuel energy storage system possesses all the advantages of conventional hydrogen storage systems,but unlike hydrogen, liquid e-fuels are as easy and safe to store and transport as gasoline. The potential efuel candidates have been identified to include inorganic electroactive materials, organic electroactive materials, and suspension of solid electroactive materials. In this work, we demonstrate an example efuel energy storage system for large-scale energy storage using inorganic e-fuels composed of V^(2+)/V^(3+) and VO_2^+/VO_2^+ redox couples, and compare the performance of the e-fuel energy storage system with that of existing technologies. Results show that our e-fuel charger achieves a charge efficiency of as high as~94%, while the e-fuel cell is capable of delivering a peak power density of 3.4 W cm^(-2), which is 1.7 times higher than that of hydrogen fuel cells. More excitingly, the e-fuel energy storage system exhibits a round-trip efficiency of 80.0% and an electrolyte utilization of 83.0% at an ultra-high discharge current density of 1,000 mA cm^(-2), which are 19.9% and 67.3% higher than those of conventional vanadium redox flow batteries. This unprecedented performance allows a 27.0% reduction in the capital cost of the e-fuel energy storage system compared with that of vanadium redox flow batteries. | Haoran Jiang Lei Wei Xinzhuang Fan Jianbo Xu Wei Shyy Tianshou Zhao | 2019 | Science Bulletin2019，64，4： | 2 |
| 8 | AMPK Phosphorylates and Inhibits SREBP Activity to Attenuate Hepatic Steatosis and Atherosclerosis in Diet-Induced Insulin-Resistant Mice显示文摘 | Yu Li Shanqin Xu Maria M. Mihaylova Bin Zheng Xiuyun Hou Bingbing Jiang Ogyi Park Zhijun Luo Etienne Lefai John Y.-J. Shyy Bin Gao Michel Wierzbicki Tony J. Verbeuren Reuben J. Shaw Richard A. Cohen Mengwei Zang | 2011 | Cell Metabolism2011，，4： | 2 |
| 9 | Outcomes of combination MRI-targeted and transperineal template biopsy in restaging low-risk prostate cancer for active surveillance显示文摘Objective:Active surveillance(AS)offers a strategy to reduce overtreatment and now is a widely accepted treatment option for low-risk prostate cancer.An ideal tool for risk-stratification would detect aggressive cancers and exclude such men from taking up AS in the first place.We evaluate if a combination of transperineal template biopsy with magnetic resonance imaging(MRI)-targeted biopsy identifies significant prostate cancer amongst men initially diagnosed with low-risk prostate cancer.Methods:This prospective,single-blinded study included men with low-risk prostate cancer(D’Amico’s Criteria)diagnosed on conventional transrectal ultrasound-guided biopsy.Patients first underwent multiparametric MRI of the prostate6 weeks after initial biopsy.Each suspicious lesion is mapped and assigned a Prostate Imaging Reporting and Data System(PIRADS)score.Template biopsy is first performed with the surgeon blinded to MRI findings followed by MRI-targeted biopsy using a robotic transperineal biopsy platform.Results:The age of the 19 men included is 65.4±4.9 years(mean±SD).Prostate specific antigen(PSA)at diagnosis and at the time of transperineal biopsy were comparable(7.3±1.7 ng/mL and 7.0±1.8 ng/mL,p Z 0.67),so were prostate volumes(34.2±8.9 mL and 32.1±13.4 mL,p Z 0.28).MRI-targeted biopsy had a higher percentage of cancer detection per core compared to template biopsy(11.7%vs.6.5%,p Z 0.02),this was more than 3 times superior for Gleason 7 disease(5.9%vs.1.6%,p<0.01).Four of 18(22.2%)patients with MRI lesions had significant disease with MRI-targeted biopsy alone.Three of 19 patients(15.8%)had significant disease with template biopsy alone.In combination,both techniques upclassified five patients(26.3%),all of whom underwent radical prostatectomy.Whole mount histology confirmed tumour location and grade.All six patients with PIRADS 5 lesions had cancer detected(66.6%significant disease).Conclusion:A combination of MRI-targeted and template biopsy may optimally risk-classify“low-risk”patients diagnosed on initial conventional transrectal ultrasonography(TRUS)prostate biopsy. | Kenneth Chen Kae Jack Tay Yan Mee Law Hakan Aydin Henry Ho Christopher Cheng John Shyi Peng Yuen | 2018 | Asian Journal of Urology2018，5，3： | 2 |
| 10 | Near wake vortex dynamics of a hovering hawkmoth显示文摘Numerical investigation of vortex dynamics innear wake of a hovering hawkmoth and hovering aerody-namics is conducted to support the development of abiology-inspired dynamic flight simulator for flapping wing-based micro air vehicles.Realistic wing-body morphologiesand kinematics are adopted in the numerical simulations.The computed results show 3D mechanisms of vortical flowstructures in hawkrnoth-like hovering.A horseshoe-shapedprimary vortex is observed to wrap around each wing duringthe early down- and upstroke; the horseshoe-shaped vortexsubsequently grows into a doughnut-shaped vortex ring withan intense jet-flow present in its core,forming a downwash.The doughnut-shaped vortex rings of the wing pair eventu-ally break up into two circular vortex tings as they propagatedownstream in the wake.The aerodynamic yawing and roll-ing torques are canceled out due to the symmetric wing kine-matics even though the aerodynamic pitching torque showssignificant variation with time.On the other hand,the time-varying the aerodynamics pitching torque could make thebody a longitudinal oscillation over one flapping cycle. | Hikaru Aono Wei Shyy Hao Liu | 2009 | Acta Mechanica Sinica2009，25，1： | 2 |
| 11 | Compact higher-order gas-kinetic schemes with spectral-like resolution for compressible flow simulations显示文摘In this paper,a class of compact higher-order gas-kinetic schemes(GKS)with spectrallike resolution will be presented.Based on the high-order gas evolution model,both the flux function and conservative flow variables in GKS can be evaluated explicitly from the time-accurate gas distribution function at a cell interface.As a result,inside each control volume both the cell-averaged flow variables and their cell-averaged gradients can be updated within each time step.The flow variable update and slope update are coming from the same physical solution at the cell interface.This strategy needs time accurate solution at a cell interface,which cannot be achieved by the Riemann problem based flow solvers,even though they can also provide the interface flux functions and interface flow variables.Instead,in order to update the slopes in the Riemann-solver based schemes,such as HWENO,there are additional governing equations for slopes or equivalent degrees of freedom inside each cell.In GKS,only a single time accurate gas evolution model is needed at the cell interface for updating cell averaged flow variables through interface fluxes and updating the cell averaged slopes through the interface flow variables.Based on both cell averaged values and their slopes,compact 6th-order and 8th-order linear and nonlinear reconstructions can be developed.As analyzed in this paper,the local linear compact reconstruction without limiter can achieve a spectral-like resolution at large wavenumber than the well-established compact scheme of Lele with globally coupled flow variables and their derivatives.For nonlinear gas dynamic evolution,in order to avoid spurious oscillation in discontinuous region,the above compact linear reconstruction from the symmetric stencil can be divided into sub-stencils and apply a biased nonlinear WENO-Z reconstruction.Consequently discontinuous solutions can be captured through the 6th-order and 8th-order compact WENO-type nonlinear reconstruction.In GKS,the time evolution solution of the gas distribution function at a cell interface is based on an integral solution of the kinetic model equation,which covers a physical process from an initial non-equilibrium state to a final equilibrium one.Since the initial non-equilibrium state is obtained based on the nonlinear WENO-Z reconstruction,and the equilibrium state is basically constructed from the linear symmetric reconstruction,the GKS evolution models unifies the nonlinear and linear reconstructions in a gas relaxation process in the determination of a time-dependent gas distribution function.This property gives GKS great advantages in capturing both discontinuous shock waves and the linear aero-acoustic waves in a single computation due to its dynamical adaptation of non-equilibrium and equilibrium states in different flow regions.This dynamically adaptive model helps to solve a long lasting problem in the development of high-order schemes about the choices of the linear and nonlinear reconstructions.Compared with discontinuous Galerkin(DG)scheme,the current compact GKS uses the same local and compact stencil,achieves the 6th-order and 8th-order accuracy,uses a much larger time step with CFL number≥0.3,has the robustness as a 2nd-order scheme,and gets accurate solutions in both shock and smooth regions without introducing trouble cell and additional limiting process.The nonlinear reconstruction in the compact GKS is solely based on the WENO-Z technique.At the same time,the current scheme solves the Navier-Stokes equations automatically due to combined inviscid and viscous flux terms from a single time evolution gas distribution function at a cell interface.Due to the use of multi-stage multi-derivative(MSMD)time-stepping technique,for achieving a 4th-order time accuracy,the current scheme uses only two stages instead of four in the traditional Runge-Kutta method.As a result,the current GKS becomes much more efficient than the corresponding same order DG method.A variety of numerical tests are presented to validate the compact 6th and 8th-order GKS.The current scheme presents a state-of-art numerical solutions under a wide range of flow conditions,i.e.,strong shock discontinuity,shear instability,aero-acoustic wave propagation,and NS solutions.It promotes the development of high-order scheme to a new level of maturity.The success of the current scheme crucially depends on the high-order gas evolution model,which cannot be achieved by any other approach once the 1st-order Riemann flux function is still used in the development of high-order numerical algorithms. | Fengxiang Zhao Xing Ji Wei Shyy Kun Xu | 2019 | Advances in Aerodynamics2019，1，1： | 2 |
| 12 | Surrogate-based analysis and optimization显示文摘 | Queipo N V Haftka R T Shyy W | 2005 | Progress in Aerospace Sciences2005，41，1： | 1 |
| 13 | Force Evalu- ation in the Lattice Boltzmann Method Involving Curved Geometry 显示文摘 | MEI Renwei YU Dazhi Shyy Wei Luo LS | 2002 | Phys Rev E2002，65，04： | 1 |
| 14 | Modeling of Fluid Dynamics and Heat Transfer Induced by Dielectric Barrier Plasma Actumor显示文摘 | JAYARAMAN B THAKUR S SHYY W | 2007 | Journal of Heat Transfer2007，129，4： | 1 |
| 15 | Improved treatment of the open boundary in the method of Lattice Boltzmann equation 显示文摘 | YU D MEI R SHYY W | 2005 | Progress in Computational Fluid Dynamics2005，5，12： | 1 |
| 16 | Checkerboard and minimum member size control in topolo- gy optimization显示文摘 | Zhou M Shyy Y K Thomas H L | 2001 | Structural and Multidisciplinary Optimization2001，21，2： | 1 |
| 17 | Modeling of Dielectric Barrier Dis-charge-induced Fluid Dynamics and Heat Transfer显示文摘 | Jayaraman B Shyy W | | 0，，7： | 1 |
| 18 | Flapping and flexible wings for biological and micro vehicles显示文摘 | Shyy W Berg M Ljungqvist D | | 0，，： | 1 |
| 19 | Insulin and heparin suppress super - oxide production in diabetic rat slomeruli stimulated with low - density lipoprotein显示文摘 | Hung CC Jinn YG Shyi JS | 2001 | Kindney Int2001，59，： | 1 |
| 20 | Modeling of Dielectric Barrier Dis-charge-induced Fluid Dynamics and Heat Transfer显示文摘 | Jayaraman B Shyy W | | 0，，： | 1 |
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