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An Improved Dynamic Core for a Non-hydrostatic Model System on the Yin-Yang Grid

Advances in Atmospheric Sciences 2015年第5期32卷 648-658页

作者： li Xiaohan PENG Xindong li xingliang State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Center of Numerical Weather Prediction China Meteorological Administration

A 3D dynamic core of the non-hydrostatic model GRAPES（Global/Regional Assimilation and Prediction System） is developed on the Yin-Yang grid to address the polar problem and to enhance the computational efficiency. Three-dimensional Coriolis forcing is introduced to the new core, and full representation of the Coriolis forcing makes it straightforward to share code between the Yin and Yang subdomains. Similar to that in the original GRAPES model, a semi-implicit semi-Lagrangian scheme is adopted for temporal integration and advection with additional arrangement for cross-boundary transport. Under a non-centered second-order temporal and spatial discretization, the dry nonhydrostatic frame is summarized as the solution of an elliptical problem. The resulting Helmholtz equation is solved with the Generalized Conjugate Residual solver in cooperation with the classic Schwarz method. Even though the coefficients of the equation are quite different from those in the original model, the computational procedure of the new core is just the same. The bi-cubic Lagrangian interpolation serves to provide Dirichlet-type boundary conditions with data transfer between the subdomains. The dry core is evaluated with several benchmark test cases, and all the tests display reasonable numerical stability and computing performance. Persistency of the balanced flow and development of both the mountain-induced Rossby wave and Rossby–Haurwitz wave confirms the appropriate installation of the 3D Coriolis terms in the semi-implicit semi-Lagrangian dynamic core on the Yin-Yang grid.

关键词： Yin-Yang grid semi-implicit semi-Lagrangian nonhydrostatic dynamic core

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Improvement of the Semi-Lagrangian Advection Scheme in the GRAPES Model:Theoretical Analysis and Idealized Tests

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Advances in Atmospheric Sciences 2014年第3期31卷 693-704页

作者： HUANG Bo CHEN Dehui li xingliang li Chao Chinese Academy of Meteorological Sciences Numerical Weather Prediction Center China Meteorological Administration University of Chinese Academy of Sciences

ABSTRACT The Global/Regional Assimilation and PrEdiction System （GRAPES） is the newgeneration numerical weather predic- tion （NWP） system developed by the China Meteorological Administration. It is a fully compressible non-hydrostatical global/regional unified model that uses a traditional semi-Lagrangian advection scheme with cubic Lagrangian interpola tion （referred to as the SL_CL scheme）. The SL_CL scheme has been used in many operational NWP models, but there are still some deficiencies, such as the damping effects due to the interpolation and the relatively low accuracy. Based on Reich＇s semi-Lagrangian advection scheme （referred to as the R2007 scheme）, the Re_R2007 scheme that uses the low- and high-order B-spline function for interpolation at the departure point, is developed in this paper. One- and two-dimensional idealized tests in the rectangular coordinate system with uniform grid cells were conducted to compare the Re..R2007 scheme and the SL_CL scheme. The numerical results showed that：（1） the damping effects were remarkably reduced with the Re_R2007 scheme; and （2） the normalized errors of the Re_R2007 scheme were about 7.5 and 3 times smaller than those of the SL_CL scheme in one- and two-dimensional tests, respectively, indicating the higher accuracy of the Re..R2007 scheme. Furthermore, two solid-body rotation tests were conducted in the latitude-longitude spherical coordinate system with non uniform grid cells, which also verified the Re_R2007 scheme＇s advantages. Finally, in comparison with other global advection schemes, the Re_R2007 scheme was competitive in terms of accuracy and flow independence. An encouraging possibility for the application of the Re_R2007 scheme to the GRAPES model is provided.

关键词： numerical models semi-Lagrangian method advection scheme numerical accuracy spline interpolation

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Crystal Structure Stability of Simulated Sr1-1.5xYxTiO3(x=0-0.12)Waste Forms

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 89-93页

作者：牟婉君 YU Qianhong li xingliang WEI Hongyuan 蹇源 Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction *** effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYxTiO3（x=0-0.12） were *** and single-phase perovskite-type Sr1-1.5xYxTiO3（x0.08） solid solutions were obtained at 1 400 ℃ for 6 *** perovskite-type SrTiO3 and pyrochlore-phase Y2Ti2O7 coexisted for x = 0.08-0.12,leading to an unstable and unfavourable solid solution structure for long-term immobilization of the *** X-ray diffraction patterns for Rietveld refinement analysis confirmed the formation of a Sr1-1.5xYxTiO3（x = 0-0.12） continuous solid *** and bending vibrations were assigned in the infrared *** SrTiO3 grain size increased with Y *** leaching behavior of Y^3＋ from the waste forms of Sr1-1.5xYxTiO3 was controlled by its structural change.

关键词： perovskite-type SrTiO3 phase transition temperature leaching behavior

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A Positivity-preserving Conservative Semi-Lagrangian Multi-moment Global Transport Model on the Cubed Sphere

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Advances in Atmospheric Sciences 2021年第9期38卷 1460-1473页

作者： Jie TANG Chungang CHEN Xueshun SHEN Feng XIAO xingliang li National Meteorological Center/Center of Numerical Weather Predication China Meteorological AdministrationBeijing 100081China State Key Laboratory for Strength and Vibration of Mechanical Structures&School of Aerospace Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo 152-8850Japan

A positivity-preserving conservative semi-Lagrangian transport model by multi-moment finite volume method has been developed on the cubed-sphere *** kinds of moments(i.e.,point values(PV moment) at cell interfaces and volume integrated average(VIA moment) value) are defined within a single *** PV moment is updated by a conventional semi-Lagrangian method,while the VIA moment is cast by the flux form formulation to assure the exact numerical *** from the spatial approximation used in the CSL2(conservative semi-Lagrangian scheme with second order polynomial function) scheme,a monotonic rational function which can effectively remove non-physical oscillations is reconstructed within a single cell by the PV moments and VIA *** achieve exactly positive-definite preserving,two kinds of corrections are made on the original conservative semi-Lagrangian with rational function(CSLR)*** resulting scheme is inherently conservative,non-negative,and allows a Courant number larger than ***,the spatial reconstruction can be performed within a single cell,which is very efficient and economical for practical *** addition,a dimension-splitting approach coupled with multi-moment finite volume scheme is adopted on cubed-sphere geometry,which benefitsthe implementation of the 1 D CSLR solver with large Courant *** proposed model is evaluated by several widely used benchmark tests on cubed-sphere *** results show that the proposed transport model can effectively remove nonphysical oscillations and preserve the numerical nonnegativity,and it has the potential to transport the tracers accurately in a real atmospheric model.

关键词： global transport model cubed-sphere grid multi-moment method single-cell-based scheme conservative semi-Lagrangian method

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An Adaptive Nonhydrostatic Atmospheric Dynamical Core Using a Multi-Moment Constrained Finite Volume Method

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Advances in Atmospheric Sciences 2022年第3期39卷 487-501页

作者： Pei HUANG Chungang CHEN xingliang li Xueshun SHEN Feng XIAO State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an 710049China Center of Numerical Weather Prediction China Meteorological AdministrationBeijing 100081China Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo 226-8502Japan

An adaptive 2 D nonhydrostatic dynamical core is proposed by using the multi-moment constrained finite-volume(MCV) scheme and the Berger-Oliger adaptive mesh refinement(AMR) algorithm. The MCV scheme takes several pointwise values within each computational cell as the predicted variables to build high-order schemes based on single-cell reconstruction. Two types of moments, such as the volume-integrated average(VIA) and point value(PV), are defined as constraint conditions to derive the updating formulations of the unknowns, and the constraint condition on VIA guarantees the rigorous conservation of the proposed model. In this study, the MCV scheme is implemented on a height-based, terrainfollowing grid with variable resolution to solve the nonhydrostatic governing equations of atmospheric dynamics. The AMR grid of Berger-Oliger consists of several groups of blocks with different resolutions, where the MCV model developed on a fixed structured mesh can be used directly. Numerical formulations are designed to implement the coarsefine interpolation and the flux correction for properly exchanging the solution information among different blocks. Widely used benchmark tests are carried out to evaluate the proposed model. The numerical experiments on uniform and AMR grids indicate that the adaptive model has promising potential for improving computational efficiency without losing accuracy.

关键词： adaptive mesh refinement multi-moment constrained finite-volume method nonhydrostatic model dynamical core high-order methods

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Hydrothermal Synthesis of WO3 Nanowires in the Presence of Guanidine Sulfate and Its Photocatalytic Activity

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Journal of Wuhan University of Technology(Materials Science) 2016年第4期31卷 731-735页

作者：牟婉君 yu qianhong li xingliang wei hongyuan 蹇源 Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

WO3 nanowires were fabricated by a hydrothermal method,which proceeded at 170 ℃ for 48 h in a solution containing C2H10N6H2SO4 as a dispersant and Na2WO4 as a starting *** nanowires exhibit a well crystallized one-dimensional structure with 20 nm in diameter and several microns in *** physicochemical properties of WO3 were compared using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive X-ray spectroscopy（EDX） and UV-vis spectroscopy（UV-Vis）.The photoactivity of the as-perpared WO3 nanowires was evaluated through the photodegradation of methylene blue（MB） in aqueous *** experimental results demonstrate that addition of C2H10N6H2SO4 salt in the WO3 nanowires synthesis process can enhance its photocatalytic activity obviously.

关键词： hydrothermal photocatalytic dispersive crystallized tungsten starting length hexagonal methylene nanotubes

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Preparation of Tungsten Film and Its Tribological Properties under Boundary Lubrication Conditions

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China Petroleum Processing & Petrochemical Technology 2014年第3期16卷 84-91页

作者： li xingliang Yue Wen Wang Song li Guolong Zhao Shiqian Aviation Key Laboratory of Science and Technology on Precision Manufacturing Technology Beijing Precision Engineering Institute for Aircraft Industry School of Engineering and Technology China University of Geosciences (Beijing) Xi'an Research Institute of China Coal Technology & Engineering Group Corp.

Tungsten film(W film) is deposited by using the ion beam assisted deposition(IBAD) on the 316 L substrate surface in this experiment. The micro structure and nano-hardness of the film are investigated by scanning electron microscopy(SEM) and nano-indentation tester. The tribological behavior of W film under lubrication by oil with ZDDP and MoDTC is evaluated by a SRV test machine. The tribo-film formed on the worn surfaces is investigated by X-ray photoelectron spectroscopy(XPS) to find out the tribological mechanisms between the W film and the two additional additives. The result shows that the W film lubricated by ZDDP and MoDTC-blended base oil has synergistic effects on the friction reduction property, while the anti-wear property is mainly caused by the hard surface of W film.

关键词： IBAD W film lubricant additive tribological properties.

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A 3D Nonhydrostatic Compressible Atmospheric Dynamic Core by Multi-moment Constrained Finite Volume Method

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Advances in Atmospheric Sciences 2019年第10期36卷 1129-1142页

作者： Qingchang QIN Xueshun SHEN Chungang CHEN Feng XIAO Yongjiu DAI xingliang li College of Global Change and Earth System Science Beijing Normal University Beijing 100875 China Center of Numerical Weather Predication China Meteorological Administration Beijing 100081 China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an 710049 China Department of Mechanical Engineering Tokyo Institute of Technology Tokyo 226-8502 Japan School of Atmospheric Sciences Sun Yat-Sen University Guangzhou 510275 China Beijing Meteorological Observatory Beijing 100089 China

A 3D compressible nonhydrostatic dynamic core based on a three-point multi-moment constrained finite-volume (MCV) method is developed by extending the previous 2D nonhydrostatic atmospheric dynamics to 3D on a terrainfollowing grid. The MCV algorithm defines two types of moments: the point-wise value (PV) and the volume-integrated average (VIA). The unknowns (PV values) are defined at the solution points within each cell and are updated through the time evolution formulations derived from the governing equations. Rigorous numerical conservation is ensured by a constraint on the VIA moment through the flux form formulation. The 3D atmospheric dynamic core reported in this paper is based on a three-point MCV method and has some advantages in comparison with other existing methods, such as uniform third-order accuracy, a compact stencil, and algorithmic simplicity. To check the performance of the 3D nonhydrostatic dynamic core, various benchmark test cases are performed. All the numerical results show that the present dynamic core is very competitive when compared to other existing advanced models, and thus lays the foundation for further developing global atmospheric models in the near future.

关键词： multi-moment constrained finite-volume method nonhydrostatic dynamic core topography height-based terrain-following coordinate

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Complexation between uranyl(Ⅵ)and CMPO in a hydroxyl-functionalized ionic liquid:An extraction,spectrophotography,and calorimetry study

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Chinese Chemical Letters 2022年第7期33卷 3451-3455页

作者： Baihua Chen Jun liu Hongyuan Wei Yuchuan Yang xingliang li Shuming Peng Yanqiu Yang Institute of Nuclear Physics and Chemistry CAEPMianyang 621900China

The extraction complexes of uranyl(Ⅵ)in HNO_(3)to a hydroxyl-functionalized ionic liquid(IL)phase,HOEtmimNTf2bearing CMPO,were *** possibly successive extraction complexes,UO_(2)L^(2+)(L=CMPO),UO2L_(2)^(2+) and UO_(2)L_(3)^(2+),were detected based on variable U/L ***(Ⅵ)prefers to be extracted as complex UO_(2)L_(3)^(2+),combining with the ions from HOEtmimNTf_(2) to construct a solid material through *** thermodynamics of complexes,UO_(2)L_(j)^(2+)(j=1-3),were studied by spectrophotometry and *** the formation reactions are principally driven by entropy,although a small part of the driving force of complexes UO_(2)L_(2)^(2+)and UO_(2)L_(3)^(2+) comes from *** on the thermodynamic properties for complex UO_(2)L_(3)^(2+),we provide a possible coordination mode in HOEtmim NTf_(2):the first CMPO molecule coordinates with UO_(2)^(2+) in a bidentate fashion while the others do in a monodentate *** results offer a thermodynamic insight into the formation behaviors of the uranyl(Ⅵ)/CMPO complexes involving the special IL HOEtmimNTf_(2),which is of significance to advance the novel IL extraction strategy.

关键词： Uranyl(Ⅵ) CMPO Ionic liquid Solvent extraction Complexation Thermodynamics

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Preparation of uranium targets by electro-deposition method

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Nuclear Science and Techniques 2010年第3期21卷 161-164页

作者： HE Jiaheng CHEN Qiping ZHONG Wenbin li xingliang WANG Jing DANG Yufeng liU Guopin Institute of Nuclear Physics and Chemistry . China Academy of Engineering Physics Mianyang 621900 China

In this paper,uranium targets are prepared by *** uranium dioxide films are electrodeposited into stainless steel plates using uranyl nitrate in ammonium oxalate *** results show that the deposition efficiency of the uranium depends on many parameters,such as pH value,supporting electrolyte, current density,and cell *** uranium films were characterized by infrared spectrum,scanning electron microscope,and X-ray *** uranium films,with a yield of 98%,are in the thickness of about 6 mg·cm^(-2).

关键词：电沉积法铀靶制备扫描电子显微镜支持电解质不锈钢板沉积效率单元设计

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