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Numerical simulations of Atlantic meridional overturning circulation(AMOC)from OMIP experiments and its sensitivity to surface forcing

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Journal of Oceanology and Limnology 2024年第2期42卷 454-467页

作者： xiaowei wang Yongqiang YU State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Atlantic meridional overturning circulation(AMOC)plays an important role in transporting heat meridionally in the Earth’s climate system and is also a key metrical tool to verify oceanic general circulation *** OMIP(Ocean Model Intercomparison Project phase 1 and 2)simulations with LICOM3(version 3 of the LASG/IAP Climate System Ocean Model)developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics(IAP),are compared in this *** simulations well reproduce the fundamental characteristics of the AMOC,but the OMIP1 simulation shows a significantly stronger AMOC than the OMIP2 *** the LICOM3 configurations are identical between these two experiments,any differences between them must be attributed to the surface forcing *** analysis suggests that sea surface salinity(SSS)differences should be mainly responsible for the enhanced AMOC in the OMIP1 simulation,but sea surface temperature(SST)also play an unignorable role in modulating *** the North Atlantic,where deep convection occurs,the SSS in OMIP1 is more saline than that in *** find that in the major region of deep convection,the change of SSS has more significant effect on density than the change of *** a result,the SSS was more saline than that in OMIP2,leading to stronger deep convection and subsequently intensify the *** conduct a series of numerical experiments with LICOM3,and the results confirmed that the changes in SSS have more significant effect on the strength of AMOC than the changes in SST.

关键词： oceanic general circulation model(OGCM) Atlantic meridional overturning(AMOC) surface forcing deep convection

Effect of Interstitial Hydrogen on Cohesive Strength of Al Grain Boundary with Mg Segregation

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Journal of Materials Science & Technology 2006年第1期22卷 135-138页

作者： Xiaoguang LIU xiaowei wang Jingyang wang Hongyan ZHANG Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China International Centre for Materials Physics Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China Dept. of MIME University of Toledo Toledo OH 43606 USA

The effect of interstitial hydrogen on the cohesion of the Al ∑ =11（113） grain boundary （GB） is investigated based on the thermodynamic model of Rice-wang using the first-principles density tunction calculation. I he results indicate that interstitial H behaves as an embrittler from ＂strengthening energy＂ analysis. The reduced GB cohesion due to the presence of H at the GB is attributed to the low affinity between H and Al, and the weakened bonding of Al atomic pairs perpendicular to GB plane.

关键词： Hydrogen Grain boundary Al-Mg alloys

Toward a Confucian Notion of Human Dignity

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Frontiers of Philosophy in China 2020年第1期15卷 7-28页

作者： wang xiaowei School of Philosophy Renmin University of ChinaBeijing 100872China

This essay discusses the possibility of conceptualizing a Confucian notion of human *** discussions on this topic have been either historical or reconstructive,the former discussing mainly how Confucianism considers dignity and the latter exploring the possibility of conceptualizing a Confucian human dignity as an alternative to Kant’s *** essay focuses on mainly the latter ***,I critically evaluate professor Ni Peimin’s celebrated attempt at reconstructing Confucian dignity in the context of Kant^Menschenwiirde,arguing that Ni9s work offers us novel and original insights on human dignity but fails to be coherent in several *** the other hand,Kant^Menschenwiirde may well lack motivation in particular circumstances,and gives no credit to moral *** upon this criticism,I further Ni’s discussion of the“four hearts”and propose a revised version of Confucian dignity.

关键词： human dignity Confucianism Menschenwiirde four hearts

Numerical study of high-pressure GO_2/GH_2 combustion of a single-element injector

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Science China(Technological Sciences) 2012年第10期55卷 2757-2768页

作者： wang xiaowei CAI GuoBiao HUO HongFa School of Astronautics Beihang UniversityBeijing 100191China School of Aerospace Engineering Georgia Institute of TechnologyAtlanta30332USA

A single-element shear-coaxial combustor using gaseous hydrogen(GH2) and oxygen(GO2) was designed and *** wall temperature was *** combustion flowfield of this GH2 /GO2 single-element combustor was modeled by RANS(Reynolds Averaged Navier-Stokes) and LES(Large Eddy Simulation) methods *** impact of using various turbulence and turbulent combustion models was investigated to obtain the model combination which best represented the experimental data in the RANS *** flamelet model was used in the LES modeling and the validity of its application to the GH2 /GO2 combustion in the combustor was carefully *** combustor wall heat flux distributions of both RANS and LES results show good agreement with the experimental *** experimental wall temperature distribution can be clearly explained through analyzing the inner flowfield *** results indicate that both RANS and LES used in this paper can give good predictions of the development of the whole flowfield and the combustion completion *** can resolve large-scale flow motions in the combustor and accurately predict the influence of the wall heat loss on the combustion efficiency.

关键词： Large-Eddy Simulation Reynolds Averaged Navier-Stokes equations turbulent combustion rocket numerical simulation

Parallelization of pseudo-particle modeling and its application in simulating gas-solid fluidization

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Particuology 2009年第4期7卷 317-323页

作者： Jianxin Lu Jiayuan Zhang xiaowei wang Limin wang Wei Ge Graduate School of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

Pseudo-Particle Modeling （PPM） is a particle method proposed by Ge and Li in 1996 [Ge, W., ＆ Li, J. （1996）. Pseudo-particle approach to hydrodynamics of particle-fluid systems, in M. Kwauk ＆ J. Li （Eds.）, Proceedings of the 5th international conference on drculating fluidized bed （pp. 260-265）. Beijing： Science Press] and has been used to explore the microscopic mechanism in complex particle-fluid systems. But as a particle method, high computational cost remains a main obstacle for its large-scale application; therefore, parallel implementation of this method is highly desirable. Parallelization of two-dimensional PPM was carried out by spatial decomposition in this paper. The time costs of the major functions in the program were analyzed and the program was then optimized for higher efficiency by dynamic load balancing and resetting of particle arrays. Finally, simulation on a gas-solid fluidized bed with 102,400 solid particles and 1.8 × 10^7 pseudo-particles was performed successfully with this code, indicating its scalability in future applications.

关键词： Parallelization Pseudo-particle modeling Gas-solid fluidization Dynamic load balancing

Enrichments of methanotrophic–heterotrophic cultures with high poly-β-hydroxybutyrate(PHB) accumulation capacities

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Journal of Environmental Sciences 2018年第3期30卷 133-143页

作者： Tingting Zhang xiaowei wang Jiti Zhou Yu Zhang Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and Technology Dalian University of Technology

Methanotrophic–heterotrophic communities were selectively enriched from sewage sludge to obtain a mixed culture with high levels of poly-β-hydroxybutyrate（PHB）accumulation capacity from *** was used as the carbon source,N2as sole nitrogen source,and oxygen and Cu content were *** proved essential for PHB *** cultures enriched with Cu could accumulate high content of PHB（43.2%–45.9%）,while only small amounts of PHB were accumulated by cultures enriched without Cu（11.9%–17.5%）.Batch assays revealed that communities grown with Cu and a higher O2content synthesized more PHB,which had a wider optimal CH4：O2range and produced a high PHB content（48.7%）even though in the presence of *** all methanotrophic–heterotrophic communities,both methanotrophic and heterotrophic populations showed the ability to accumulate *** methane was added as the sole carbon source,heterotrophs dominated with abundances between 77.2%and 85.6%.All methanotrophs detected belonged to type II genera,which formed stable communities with heterotrophs of different PHB production capacities.

关键词： Methanotroph Activated sludge PHB N2-fixation Methane monooxygenase

GPS/VISNAV integrated relative navigation and attitude determination system for ultra-close spacecraft formation flying

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Journal of Systems Engineering and Electronics 2011年第2期22卷 283-291页

作者： Xiaoliang wang xiaowei Shao Deren Gong Dengping Duan Institute of Aerospace Science & Technology Shanghai Jiaotong University Shanghai 200240 P. R. China

For the improvement of accuracy and better fault-tolerant performance, a global position system （GPS）/vision navigation （VISNAV） integrated relative navigation and attitude determination approach is presented for ultra-close spacecraft formation flying. Onboard GPS and VISNAV system are adopted and a federal Kalman filter architecture is used for the total navigation system design. Simulation results indicate that the integrated system can provide a total improvement of relative navigation and attitude estimation performance in accuracy and fault-tolerance.

关键词： control and navigation relative navigation federalKalman filter spacecraft formation flying global position system(GPS) vision navigation (VISNAV).

Coupled effects of methane monooxygenase and nitrogen source on growth and poly-β-hydroxybutyrate(PHB)production of Methylosinus trichosporium OB3b

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Journal of Environmental Sciences 2017年第2期29卷 49-57页

作者： Tingting Zhang Jiti Zhou xiaowei wang Yu Zhang Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Sdence and TechnologyDalian University of TechnologyDalian 115024China

The coupled effects of nitrogen source and methane monooxygenase（MMO） on the growth and poly-β-hydroxybutyrate（PHB） accumulation capacity of methanotrophs were *** ammonia-supplied methanotrophs expressing soluble MMO（s MMO） grew at the highest rate, while N2-fixing bacteria expressing particulate MMO（p MMO） grew at the lowest rate. Further study showed that more hydroxylamine and nitrite was formed by ammonia-supplied bacteria containing p MMO, which might cause their slightly lower growth rate. The highest PHB content（51.0%） was obtained under nitrogen-limiting conditions with the inoculation of nitrate-supplied bacteria containing p MMO. Ammoniasupplied bacteria also accumulated a higher content of PHB（45.2%） with the expression of p MMO, while N2-fixing bacteria containing p MMO only showed low PHB production capacity（32.1%）. The maximal PHB contents of bacteria expressing s MMO were low, with no significant change under different nitrogen source conditions. The low MMO activity,low cell growth rate and low PHB production capacity of methanotrophs continuously cultivated with N2 with the expression of p MMO were greatly improved in the cyclic NO3-N2 cultivation regime, indicating that long-term deficiency of nitrogen sources was detrimental to the activity of methanotrophs expressing pMMO.

关键词： Methane Methanotroph PHB Nitrogen source Methane monooxygenase

Validation of EMMS-based drag model using lattice Boltzmann simulations on GPUs

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Particuology 2011年第4期9卷 365-373页

作者： Yun Zhang Wei Ge xiaowei wang Chaohe Yang State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266555 China The EMMS Croup State Key Laboratory of Multi-phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

lnterphase momentum transport in heterogeneous gas-solid systems with multi-scale structure is of great importance in process engineering. In this article, lattice Boltzmann simulations are performed on graphics processing units （GPUs）, the computational power of which exceeds that of CPUs by more than one order of magnitude, to investigate incompressible Newtonian flow in idealized multi-scale particle-fluid systems. The structure consists of a periodic array of clusters, each constructed by a bundle of cylinders. Fixed pressure boundary condition is implemented by applying a constant body force to the flow through the medium. The bounce-back scheme is adopted on the fluid-solid interfaces, which ensures the no-slip boundary condition. The structure is studied under a wide range of particle diameters and packing fractions, and the drag coefficient of the structure is found to be a function of voidages and fractions of the clusters, besides the traditional Reynolds number and the solid volume fractions. Parameters reflecting multi-scale characters are, therefore, demonstrated to be necessary in quantifying the drag force of heterogeneous gas-solid system. The numerical results in the range 0.1 〈 Re 〈 10 and 0 〈 Ф 〈 0.25 are compared with Wen and Yu＇s correlation, Gibilaro equation, EMMS-based drag model, the Beetstra correlation and the Benyahia correlation, and good agreement is found between the simulations and the EMMS-based drag model for heterogeneous systems.

关键词： EMMS Drag model Lattice Boltzmann method GPU