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OpenIFEM:A High Performance Modular Open-Source Software of the Immersed Finite Element Method for Fluid-Structure Interactions

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Computer Modeling in Engineering & Sciences 2019年第4期119卷 91-124页

作者： Jie Cheng Feimi Yu Lucy t.zhang Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic InstituteTroyNY12180USA

We present a high performance modularly-built open-source *** is a C++implementation of the modified immersed finite element method(mIFEM)to solve fluid-structure interaction(FSI)*** software is modularly built to perform multiple tasks including fluid dynamics(incompressible and slightly compressible fluid models),linear and nonlinear solid mechanics,and fully coupled fluid-structure *** of open-source software packages are restricted to certain discretization methods;some are under-tested,under-documented,and lack modularity as well as *** is designed and built to include a set of generic classes for users to adapt so that any fluid and solid solvers can be coupled through the FSI *** addition,the package utilizes well-developed and tested *** also comes with standard test cases that serve as software and algorithm *** software can be built on cross-platform,i.e.,Linux,Windows,and Mac OS,using *** parallelization is also implemented for high-performance computing for large-sized *** is documented using Doxygen and publicly available to download on *** is expected to benefit the future development of FSI algorithms and be applied to a variety of FSI applications.

关键词： Immersed finite element method open-source parallelization fluid-structure interaction adaptive mesh refinement

Hierarchical fractal structure of perfect single-layer graphene

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Frontiers of Mechanical Engineering 2013年第4期8卷 371-382页

作者： t.zhang K.Ding Research Center for Solid Mechanics Beihang University School of Engineering Brown University School of Instrument Science and Opto-electronic Engineering Beihang University

the atomic lattice structure of perfect singlelayer graphene that can actually be regarded as a kind of hierarchical fractal structure from the perspective of fractal geometry was studied for the first *** novel and special discoveries on hierarchical fractal structure and sets were unveiled upon examination of the regular crystal lattices of the single-layer *** interior fractaltype structure was discovered to be the fifth space-filling curve from physical *** efficient methods for calculating the fractal dimension of this fresh member was also *** outer boundary curve had a fractal dimension equal to one,and a multi-fractal structure from a naturally existing material was found for the first time.A series of strict self-similar hexagons comprised a rotating fractal *** hexagons slewed at a constant counterclockwise angle α of 19.1° when observed from one level to the next higher *** the perspective of fractal geometry,these pioneering discoveries added three new members to the existing regular fractal structures and sets.A fundamental example of a multi-fractal structure was also presented.

关键词： hierarchical fractal structure fractal dimension the fifth space-filling curve multi-fractal structure

Preface:Simulation of Fluid-Structure Interaction Problems

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Computer Modeling in Engineering & Sciences 2019年第4期119卷 1-3页

作者： Zhilin Li X.Sheldon Wang Lucy t.zhang Department of Mathematics 2108 SAS HallNC StateRaleighNC 27695USA McCoy School of Engineering Midwestern State University3410 Taft BoulevardWichita FallsTX 76308USA Department of Mechanical Aerospace&Nuclear EngineeringRensselaer Polytechnic Institute1108th St.TroyNY 12180USA

In recent years,there has been a major surge of interest in the development of simulation techniques and strategies for fluid-structure interaction(FSI)problems,mainly driven by a large spectrum of applications in phy... 详细信息

关键词： Structure Preface strategies

A prediction of in vivo mechanical stresses in blood vessels using thermal expansion method and its application to hypertension and vascular stenosis

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Acta Mechanica Sinica 2018年第6期34卷 1156-1166页

作者： Shaoxiong Yang Lucy t.zhang Cheng Hua Yunqiao Liu Jingdong tang Xiaobo Gong Zonglai Jiang Shaoxiong Yan91·Lucy t.Zhan92 3·Cheng Hua4·Yunqiao Liul·Jingdong Tan95·Xiaobo Gon916.Zonglai Jian971Key Laboratory of Hydrodynamics(Ministry of Education)Department of Engineering MechanicsSchool of NavalArchitectureOcean and Civil EngineeringShanghai JiaoTong UniversityShanghai200240China Department of Mechanical Aerospace and NuclearEngineeringRensselaer Polytechnic InstituteTroyNY12180.USA School of Mechanical Engineering Tianjin University ofScience and TechnologyTianjin300222China Department of Aeronautics and Astronautics FudanUniversityShanghai200433China Vascular Surgery Department Shanghai Pudong HospitalFudan Affiliated Pudong Medical CenterShanghai200120China Collaborative Innovation Center for Advanced Ship and DeepSea Exploration School of Naval ArchitectureOcean andCivil EngineeringShanghai Jiao Tong UniversityShanghai200240China Institute of Mechanobiology and Biomedical Engineering School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China

Mechanical stimuli play critical roles in cardiovascular diseases,in which in vivo stresses in blood vessels present a great challenge to *** on the structural-thermal coupled finite element method,we propose a thermal expansion method to estimate stresses in multi-layer blood vessels under healthy and pathological *** proposed method provides a relatively simple and convenient means to predict reliable in vivo mechanical stresses with accurate residual *** method is first verified with the opening-up process and the pressure-radius responses for single and multi-layer vessel *** is then applied to study the stress variation in a human carotid artery at different hypertension stages and in a plaque of vascular *** results show that specific or optimal residual stresses exist for different blood pressures,which helps form a homogeneous stress distribution across vessel *** elastic shear stress is identified on the shoulder of the plaque,which contributes to the tearing effect in plaque *** present study indicates that the proposed numerical method is a capable and efficient in vivo stress evaluation of patient-specific blood vessels for clinical purposes.

关键词： Cardiovascular disease In vivo stress Multi-layer vessel structure Hypertension Stenosed vessel

Ability to detect and locate gross errors on DEM matching algorithm

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International Journal of Digital Earth 2010年第1期3卷 72-82页

作者： t.zhang M.Cen Z.Ren R.Yang Y.Feng J.Zhu Department of Surveying Engineering School of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China College of Earth Sciences Chengdu University of TechnologyChengdu 610051China

Digital elevation model(DEM)matching techniques have been extended to DEM deformation detection by substituting a robust estimator for the least squares estimator,in which terrain changes are treated as gross ***,all existing methods only emphasise their deformation detecting ability,and neglect another important aspect:only when the gross error can be detected and located,can this system be *** paper employs the gross error judgement matrix as a tool to make an in-depth analysis of this *** theoretical analyses and experimental results show that observations in the DEM matching algorithm in real applications have the ability to detect and locate gross ***,treating the terrain changes as gross errors is theoretically feasible,allowing real DEM deformations to be detected by employing a surface matching technique.

关键词： DEM matching gross error detection gross error location gross error judgement matrix least z-different algorithm deformation detection robust estimator

Shear-accelerated crystallization of glass-forming metallic liquids in high-pressure die casting

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Journal of Materials Science & technology 2022年第22期117卷 146-157页

作者： L.H.Liu W.J.Gao X.S.Huang t.zhang Z.Y.Liu C.Yang W.W.zhang W.R.Li L.Li P.J.Li National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou510640China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Institute of Eontech New Materials Co. Ltd.Dongguan523662China Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China

As one of the most important forming technologies for industrial bulk metallic glass (BMG) parts withcomplex shapes, high-pressure die casting (HPDC) can fill a die cavity with a glass-forming metallic liquidin milliseconds. However, to our knowledge, the correlation between flow and crystallization behavior inthe HPDC process has never been established. In this study, we report on the solidification behavior ofZr_(55)Cu_(30)Ni_(5)Al_(10) glass forming liquid under various flow rates. Surprisingly, the resulting alloys display adecreasing content of amorphous phase with increase of flow rate, i.e. increase of cooling rate, suggestingthat crystallization kinetics of glass-forming metallic liquids in the HPDC process is strongly dependenton the flow field. Analysis reveals that the accelerated crystallization behavior is mainly ascribed to therapid increase in viscosity with a decreasing temperature as well as to the huge shear effect in the glassforming liquid at the end stage of the filling process when the temperature is close to the glass-transitionpoint;this results in a transition from diffusion- to advection-dominated transport. the current investigation suggests that flow-related crystallization must be considered to assess the intrinsic glass-formingability of BMGs produced via HPDC. the obtained results will not only improve the understanding ofcrystallization dynamics but also promote the high-quality production and large-scale application of BMGparts.

关键词： Crystallization Shear Supercooled liquid High pressure die casting

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Quantized Conductance of Majorana Zero Mode in the Vortex of the topological Superconductor(Li_(0.84)Fe_(0.16))OHFeSe

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Chinese Physics Letters 2019年第5期36卷 90-97页

作者： C.Chen Q.Liu t.Z.zhang D.Li P.P.Shen X.L.Dong Z.-X.Zhao t.zhang D.L.Feng State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 Science and technology on Surface Physics and Chemistry Laboratory Mianyang 621908 National Laboratory of Superconductivity Institute of PhysicsChinese Academy of SciencesBeijing 100190 Hefei National Laboratory for Physical Science at Microscale CAS Center for Excellence in Quantum Information and Quantum Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026

the Major ana zero mode(MZM), which manifests as an exotic neutral excitation in superconductors, is the building block of topological quantum computing. It has recently been found in the vortices of several iron-based superconductors as a zero-bias conductance peak in tunneling spectroscopy. In particular, a clean and robust MZM has been observed in the cores of free vortices in(Li_(0.84)Fe_(0.16))OHFeSe. Here using scanning tunneling spectroscopy, we demonstrate that Major ana-induced resonant Andreev reflection occurs between the StM tip and this zero-bias bound state,and consequently, the conductance at zero bias is quantized as 2e^2/h. Our results present a hallmark signature of the MZM in the vortex of an intrinsic topological superconductor, together with its intriguing behavior.

关键词： OHFeSe Quantized Conductance of Majorana Zero Mode in the Vortex of the topological Superconductor MZM Li StM Fe

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Recent progresses on designing and manufacturing of bulk refractory alloys with high performances based on controlling interfaces

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Journal of Materials Science & technology 2020年第17期52卷 29-62页

作者： t.zhang H.W.Deng Z.M.Xie R.Liu J.F.Yang C.S.Liu X.P.Wang Q.F.Fang Y.Xiong School of Physics and Electronic Engineering Guangzhou UniversityGuangZhou 510006China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China State Key Laboratory of Environment Friendly Energy Materials West South University of Sciences and TechnologyMianYang 621010China

Refractory alloys such as tungsten and molybdenum based alloys with high strength,thermal/electrical conductivity,low coefficient of thermal expansion and excellent creep resistances are highly desirable for applications in nuclear facilities,critical components in aerospace and defense ***,the serious embrittlement limits the engineering usability of some refractory alloys.A lot of research results indicate that the performances of refractory alloys are closely related to the physical/chemical status,such as the interface dimension,interface type,interface composition of their grain boundaries(GBs),phase boundaries(PBs)and other interface *** paper reviewed the recent progress of simulations and experiments on interface design strategies that achieve high performance refractory *** strategies include GB interface purifying/strengthening,PB interface strengthening and PB/GB synergistic *** details are provided on the design/fabrication strategy such as GB interface controlling,PB interface controlling and synergistic control of multi-scaled *** corresponding performances such as the mechanical property,thermal conductivity,thermal load resistance,thermal stability,irradiation resistance,and oxidation resistance are reviewed in the aspect to the effect of *** addition,the relationships between these interfaces and material properties are ***,future developments and potential new research directions for refractory alloys are proposed.

关键词： Interface controlling Designing and manufacturing Refractory alloys Structure and performance

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Experimental investigation of axial tensile and fatigue behaviors of HtS round strands

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Superconductivity 2023年第4期8卷 69-78页

作者： X.Q.Lai J.X.Zuo X.B.Hu t.zhang J.D.Liu P.Y.Li Southwestern Institute of Physics(SWIP) P.O.Box 432Chengdu 610041PR China Southwestern Institute of Physics ChengduSichuanPR China

For the development of high‐temperature superconducting(HtS)magnet systems of future fusion devices,a novel HtS round strand based on a stacking structure was designed and manufactured using second generation(2G)HtS *** mechanical loads during operation can result in irreversible degradation of the *** axial tension and fatigue loads need particular ***,it is important to investigate the electromechanical behavior of the round strand under various axial tension and cyclic *** this paper,the axial tensile and fatigue tests were conducted at 77 K,self‐*** 95%critical current(I_(c))retention as the criterion,the results of the tensile tests revealed that the average tensile stress and strain were as high as 344 MPa and 0.47%,*** characteristics were also investigated as a function of axial tensile *** significant performance degradation was observed up to 100,000 loading cycles with stress amplitudes ranging from 20 MPa to 200 *** degradation occurs after 16,000 loading cycles with 380 MPa as the maximum ***,the microscopic defects of the round strand samples due to fabrication imperfections and mechanical loading were investigated using metallographic microscope and scanning electron *** results presented in this paper are useful for comprehending and improving the mechanical behaviors of the strand in high‐field and large‐scale fusion magnet systems.

关键词： High‐temperature superconducting High‐field magnet Round strands Axial tensile and fatigue Microscopic defects