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Demonstration of the refined three-dimensional structure of mesoscale eddies and computational error estimates via lagrangian analysis

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Acta Oceanologica Sinica 2020年第7期39卷 146-164页

作者： Heqing Yin Haijin Dai Weimin Zhang Xueyan Zhang Pinqiang Wang College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Laboratory of Software Engineering for Complex Systems Changsha 410073China

In previous studies,lagrangian analyses were used to assess large-scale ocean circulation,and the lagrangian coherent structure could also reveal the evolution of the two-dimensional structure of the mesoscale ***,few studies have demonstrated the three-dimensional structure of the mesoscale eddies via lagrangian *** with previous studies,which investigated the eddy structure via a Eulerian view,we used a lagrangian view to provide a different perspective to study the eddy *** idealized cyclonic mesoscale eddy is built up over a seamount,and it presents downwelling inside the eddy and upwelling alongside the eddy formed within a closed circulation *** structure is difficult to display via a Eulerian ***,the trajectories of particles can well demonstrate the full cycle:the fluid sank and rotated inside the eddies,converged to the upwelling zone of the bottom layer and returned to the surface through *** also applied a lagrangian analysis to a realistic *** a significant phenomenon in the South China Sea,the dipole structure of the anticyclonic eddy(AE)/cyclonic eddy(CE)pair off of central Vietnam has been well studied but mainly at the sea *** a lagrangian analysis,we illustrate the three-dimensional structure of the eddy pair:the fluid sank(rose)and rotated inside the AE(CE).More importantly,the trajectories of the particles suggested that there was no fluid exchange between the two eddies since the strong boundary jet separates them from each *** the conclusions above have been verified and are supported by the computational error *** a selected time step and integral period,the computational errors always present small values,although they increase with strong divergent and vertical diffusive flow.

关键词： mesoscale eddy lagrangian analysis three-dimensional structure

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lagrangian coherent structure analysis on transport of Acetes chinensis along coast of Lianyungang,China

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Journal of Oceanology and Limnology 2024年第1期42卷 345-359页

作者： Kexin WANG Xueqing ZHANG Qi LOU Xusheng XIANG Ying XIONG College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Environment and Ecology Ministry of Education of ChinaOcean University of ChinaQingdao 266100China Jiangsu Marine Fisheries Research Institute Nantong 226007China

Spatial heterogeneity or“patchiness”of plankton distributions in the ocean has always been an attractive and challenging scientific issue to *** focused on the accumulation and dynamic mechanism of the Acetes chinensis in the Lianyungang nearshore licensed fishing *** lagrangian frame approaches including the lagrangian coherent structures theory,lagrangian residual current,and lagrangian particle-tracking model were applied to find the transport pathways and aggregation characteristics of Acetes *** exist some material transport pathways for Acetes chinensis passing through the licensed fishing area,and Acetes chinensis is easy to accumulate in the licensed fishing *** main mechanism forming this distribution pattern is the local circulation induced by the nonlinear interaction of topography and tidal *** the lagrangian coherent structure analysis and the particle trajectory tracking indicate that Acetes chinensis in the licensed fishing area come from the nearshore *** work contributed to the adjustment of licensed fishing area and the efficient utilization of fishery resources.

关键词： plankton accumulation hydrodynamic model lagrangian particle-tracking model lagrangian analysis

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Dynamic Testing Technique Based on Multi-channel Photonic Doppler Velocimetry for Investigating the Dynamic Behavior of Materials

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Acta Mechanica Solida Sinica 2019年第6期32卷 725-736页

作者： Yuanyuan Ding Yonggang Wang Zheng Zhang Huawei Lai Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China

In the present paper,more attention is paid to develop a new optical measurement approach of split-Hopkinson pressure bar(SHPB)and wave propagation inverse analysis(WPIA)by using multi-channel photonic Doppler velocimetry(PDV).Based on the particle velocities measured by PDV,the dynamic stress-strain curve of material is obtained in SHPB *** strain is determined by the radial particle velocity of specimen,and the stress is determined by the free surface particle velocity of the transmit ted *** results obtained by the new method coincide with those obtained by the conventional strain gauge *** new method is non-intrusive and insensitive to electrical noise,making it significantly more reliable than strain *** the oblique incidence of laser beam,a series of particle velocity wave propagation signals for long rod specimen are measured *** on the measurements of particle velocity profile,the dynamic constitutive response of polymethyl methacrylate(PMMA)is det ermined by WPIA *** comparison bet ween the dynamic st ress-s train curve and the quasi-static one indicates that the strain-rate effect must be taken into account for PMMA.

关键词： Dynamic mechanical behavior Photonic Doppler velocimetry Split-Hopkinson pressure bar lagrangian analysis

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SHOCK INITIATION OF EXPLOSIVES INVESTIGATED WITH SMALL PARTITION EXPERIMENT AND NUMERICAL SIMULATION

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Acta Mechanica Solida Sinica 2013年第4期26卷 353-361页

作者： Weijun Tao Shi Huan Fenglei Huang Guoping Jiang Earthquake Engineering Research Test Center of Guangzhou University State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

In order to investigate the shock ignition of high energy solid explosives by shock waves,we carry out lagrangian experiments with 2-D lagrangian technique which uses composite manganin-constantan （CMC）.The effects of the shock sensitivity of pressed solid high explosives,TNT,and the effect of the lateral rarefaction wave were *** on the measured pressure histories and the radial displacements,we formulate the Ignition and Growth reactive flow models for the pressed *** shock initiation process simulated by Ignition and Growth model agreed well with experimental *** pressed TNT model can be applied to shock initiation scenarios which are highly unpredictable and have not been or cannot be tested experimentally.

关键词： shock waves explosive lagrangian analysis state equation rarefaction wave

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DEVELOPMENT OF EXPERIMENTAL METHODS FOR IMPACT TESTING BY COMBINING HOPKINSON PRESSURE BAR WITH OTHER TECHNIQUES

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Acta Mechanica Solida Sinica 2014年第4期27卷 331-344页

作者： Lili Wang Shisheng Hu Liming Yang Zijian Sun Jue Zhu Huawei Lai Yuanyuan Ding Mechanics and Material Science Research Center Ningbo University Department of Modern Mechanics University of Science & Technology of China Huafeng Faculty Ningbo Polytechnic Department of Municipal Engineering Zhejiang University of Water Resources and Electric Power

The split Hopkinson pressure bar（SHPB） technique and the wave propagation inverse analysis（WPIA） technique are both extensively used to experimentally investigate the impact behavior of materials, although neither of them alone provides a fully satisfactory analysis. In the present paper, attention is given to new experimental techniques by incorporating a damagemodified constitutive model into the SHPB technique and combining the Hopkinson pressure bar（HPB） technique with WPIA. First, to distinguish the response due to dynamic constitutive behavior and the response due to dynamic damage evolution, the SHPB method incorporating a damage-modified constitutive model is developed, including an explicit damage-modified Zhu–Wang–Tang model and an implicit damage-modified constitutive model. Second, when the SHPB results become invalid, a method of combining new Lagrange inverse analyses with the HPB technique is developed, including cases of the HPB arranged in front of a long specimen and behind the specimen. As examples of these new methods, typical results are given for nonlinear viscoelastic polymers and concretes considering damage evolution, a super-elastic Ti–Ni alloy with phase transformation and an aluminum foam with shock waves propagating within it.

关键词： Hopkinson pressure bar SHPB lagrangian analysis high strain rate rate-dependent constitutive relation damage evolution

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Experimental Study on the Dynamic Mechanical Properties of Reinforced Concrete under Shock Loading

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Acta Mechanica Solida Sinica 2016年第1期29卷 22-30页

作者： Haifeng Liu Jie Fu Jianguo Ning Department of Civil and Hydraulic Engineering Ningxia University State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

A simple experimental method was introduced to study the mechanical properties of reinforced concrete under shock loading. The one-stage light gas gun was used to test the me- chanical properties of reinforced concrete with different reinforcement ratios under various impact velocities. Three Mn-Cu piezoresistive pressure gauges embedded in the target were used to record the voltage-time signals, from which the stress-strain curves of reinforced concrete were obtained using lagrangian analysis. Experimental results indicated that the load-bearing capacities of re- inforced concrete increased greatly with the impact velocity and the reinforcement ratio. The peak stress of the shock wave decreased exponentially with the propagation distance.

关键词： reinforced concrete shock loading lagrangian analysis dynamic mechanical properties

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