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2000 Vol. 30, No. 1

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ADVANCES IN THE FUNDAMENTAL ASPECTS OF TURBULENCE: ENERGY TRANSFER,INTERACTING SCALES, AND SELFPRESERVATION IN ISOTROPIC DECAY
2000, 30(1): . doi: 10.6052/1000-0992-2000-1-J1998-012
Abstract(2516) PDF(1655)
Abstract:
The fundamental aspects of isotropic turbulence are reviewed in reviewed in order to gain a betterinsight into the physical processes of turbulence. After first reviewing the Kolmogorov energyspectrum and the energy cascade, the Kolmogorov hypothesis of local isotropy is discussed in depth.Then, the detailed physical processes involving energy transfer and interacting scales in isotropicturbulence, including triad interactions, are reviewed. The inertial range and self-similarity are alsodiscussed along wi...
FRONTIER OF HEAT TRANSFER──MICROSCALE HEAT TRANSFER
2000, 30(1): 1-6. doi: 10.6052/1000-0992-2000-1-J1998-001
Abstract(2327) PDF(1898)
Abstract:
The engineering background of the study of microscale heat transfer has been the cooL ing of microelectronic devices since 1980's and flow and heat transfer in MEMS (Micro- Electron Mechanical System) since 1990's. Microscale heat transfer is characterized by some special phenomena at micro length/time scale differing from that in macro scale. The reasons for that are twofold. One is the invalidity of continuum assumption; the other is the variation of the relative importance of various kinds of forces. Th...
A GLOBAL REVIEW FOR THE IMPACT DYNAMIC RESEARCH OF FLEXIBLE MULTIBODY SYSTEMS
2000, 30(1): 7-14. doi: 10.6052/1000-0992-2000-1-J1998-002
Abstract(2662) PDF(1220)
Abstract:
Some basic problems in impact dynamic research of flexible multi-body systems, which include the description of the dynamic equations of flexible multi-body systems, the simplification handling on the impact modelling, the impact due to joint clearance, numerical algorithm, experimental study and the vibration control considering the impact effects etc., are analyzed thoroughly in this paper. According to the present state and the difficulties in this research field, the main tasks and the development dire...
FLEXIBLE MULTIBODY DYNAMICS WITH COUPLED RIGID AND DEFORMATION MOTIONS
2000, 30(1): 15-20. doi: 10.6052/1000-0992-2000-1-J1998-003
Abstract(2544) PDF(1991)
Abstract:
The paper first illustrates that the analysis and optimization of dynamics and control for the complex mechanical systems will have the further requirements to the field of dynamics of flexible multibody systems. In view of the recent developments in the dynamics of flexible multibody systems, it is pointed out that the research on the dynamics with coupled rigid and deformation motions is a new stage. Some research targets are given at the end of this paper.
ADVANCES IN STRUCTURAL RELIABILITY STUDIES
2000, 30(1): 21-28. doi: 10.6052/1000-0992-2000-1-J1998-004
Abstract(2088) PDF(2082)
Abstract:
This paper summarizes three models in the structural reliability research: random model, fuzzy model and non-probabilistic model. It emphasises the imporatnce of the nonprobabilistic model and its relations with other two reliability models. Finally the tendency of the structural reliability development is discussed.
A RELIABILITY-BASED MULTI-LEVEL OPTIMIZATION METHOD FOR LARGE-SCALE STRUCTURE
2000, 30(1): 29-36. doi: 10.6052/1000-0992-2000-1-J1998-005
Abstract(1780) PDF(1521)
Abstract:
Based on Aulti-level optimization theory,a reliability-based optimum strategy is presented to solve the large-scale structure problem. The main idea is that the optimum distributions of structural reliability design index and weight design index are involved in the optimization Process from the conceptual design. A large-scale structure is decomposed into a multi-level substructure system, in which the reliability-based optimum solution of the lowest-level sub-structures can be obtained by the present met...
ADVANCES IN THE STUDIES ON DELAMINATIONS BUCKLING AND GROWTH OF AXIAL-COMPRESSION LAMINATE
2000, 30(1): 37-46. doi: 10.6052/1000-0992-2000-1-J1998-006
Abstract(1647) PDF(1087)
Abstract:
Deiaminations and their further growth can reduce strength of laminates. This paper introduces the general concepts and classification of delaminations briefly. The investigative survey of delaminations is introduced through one-dimensional delaminations, two-delamina tions and delaminations in cylindrical shells. It is pointed out that the bending-stretching coupling and transverse shear have great influence on buckling load and characteristics of post-buckling of the delaminational structure. The buckling...
SOME RECENT ADVANCES IN BEM SOLUTION OF TIME-DEPENDENT PROBLEMS WITH MOVING BOUNDARIES
2000, 30(1): 47-54. doi: 10.6052/1000-0992-2000-1-J1998-007
Abstract(1617) PDF(1403)
Abstract:
For the numerical modelling of complicated nonlinear problems, BEM model shows to be superior to the domain solution methods. Especially, for time-dependent problem (for which a time-marching scheme is needed) and for moving boundary (which means changeable solution domain and boundary where the regeneration of network is needed), BEM could reduce the storage requirement and CPU time considerably. In this paper, some principal difficulties, such as the linearization of the differential operator, the treatme...
2000, 30(1): 54-54. doi: 10.6052/1000-0992-2000-1-J1998-251
Abstract(1298) PDF(792)
Abstract:
MESHLESS METHOD FOR SOLID MECHANICS
2000, 30(1): 55-65. doi: 10.6052/1000-0992-2000-1-J1998-008
Abstract(2439) PDF(1673)
Abstract:
Meshless approximations based on kernels function, moving least-squares, and partitions of unity are examined. Methods for constructing discontinuous approximations and approximations with discontinuous derivatives are also described. Next, some issues in implementation are reviewed f discretization (collocation and Galerkin), quadrature methods, and so on. At last, the paper concludes with some sample calculations.
GAS TRANSFER AT WATER SURFACES
2000, 30(1): 66-76. doi: 10.6052/1000-0992-2000-1-J1998-009
Abstract(2258) PDF(677)
Abstract:
The issue of gas transfer at air-water interfaces has received world wide concern due to its relevance in the budget of climate modifying gases. Research advances made in recent years on the problems are surveyed in the present article. Particular attention was given to some new findings concerning the coherent structure near liquid surface and its relationship with the gas transfer taking place there, which shed new light on the mechanisms of gas transfer at sheared surface. Regarding the gas transfer proc...
ADVANCES IN NUMERICAL MODELING OF NOx FORMATION IN TURBULENT COMBUSTION
2000, 30(1): 77-82. doi: 10.6052/1000-0992-2000-1-J1998-010
Abstract(1455) PDF(962)
Abstract:
As a method of optimum design in reducing pollutant emission of combustion, the numerical modeling of NOx formation in turbulent combustion plays more and more important role. In this paper, based on recent results reported by different investigators, the current status of numerical modeling of NOx formation in turbulent combustion is reviewed, and future research trends are discussed.
AN ASSESSMENT OF TIME MARCHING METHOD IN CALCULATING INTERNAL FLOW FIELDS OF TURBOMACHINERY
2000, 30(1): 83-94. doi: 10.6052/1000-0992-2000-1-J1998-011
Abstract(2049) PDF(1407)
Abstract:
The objective of this paper is to review and assess time marching method used for the analysis and design of turbomachinery. There are two classes of methods for solving the time-dependent equations:explicit and implicit. In these methods, the time derivatives in the Euler/Navier-Stokes equations are retained, thus making the equations hyperbolic in nature. Very efficient techniques have been developed to solve these hyperbolic equations for the internal flow fields of turbomachinetry. The emphasis of thi...
2000, 30(1): 145-148. doi: 10.6052/1000-0992-2000-1-J1998-247
Abstract(1423) PDF(824)
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2000, 30(1): 149-149. doi: 10.6052/1000-0992-2000-1-J1998-248
Abstract(1264) PDF(804)
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2000, 30(1): 150-154. doi: 10.6052/1000-0992-2000-1-J1998-013
Abstract(1304) PDF(891)
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2000, 30(1): 155-155. doi: 10.6052/1000-0992-2000-1-J1998-249
Abstract(1491) PDF(724)
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2000, 30(1): 156-157. doi: 10.6052/1000-0992-2000-1-J1998-250
Abstract(1132) PDF(676)
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