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Two-scale modeling of granular materials: A FEM-FEM approach

Yun-Zhu CAI, Yu-Ching WU

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 304-315 doi: 10.1007/s11709-013-0213-y

Abstract: In the present paper, a homogenization-based two-scale FEM-FEM model is developed to simulate compactionsThe granular structure consisting of two-dimensional grains is modeled by the microscopic finite elementmethod at the small-scale level, and the homogenized viscous assembly is analyzed by the macroscopicfinite element method at large-scale level.The two-scale FEM-FEM model is developed in which each particle is treated individually with the appropriate

Keywords： homogenization     two-scale     representative volume element     compaction     granular assembly     finite element method    

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Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particleturbulence model

ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 202-206 doi: 10.1007/s11708-007-0026-6

Abstract: A two-scale second-order moment particle turbulence model is developed, based on the concept of particlelarge-scale fluctuation due to turbulence and particle small-scale fluctuation due to collision.The model is employed to simulate gas-particle flows in a sudden-expansion chamber.second-order moment two-phase turbulence model.It is shown that the two-scale model is with higher calculating accuracy than the single-scale model.

Keywords： gas-particle     single-scale second-order     large-scale fluctuation     second-order     sudden-expansion    

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Large-scale model test study on the water pressure resistance of construction joints of karst tunnel

Frontiers of Structural and Civil Engineering   Pages 1249-1263 doi: 10.1007/s11709-023-0974-x

Abstract: Model tests and numerical calculations were adopted based on the New Yuanliangshan tunnel project toA large-scale model test was designed and conducted, innovatively transforming the external water pressureon the water pressure resistance of the construction joint were analyzed, and the reliability of the modelpressure resistance of the construction joint determined via numerical calculations is similar to the modeltest results, indicating that the model test results have high accuracy and reliability.

Keywords： karst tunnel     lining construction joint     water pressure resistance     large-scale model test     numerical    

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Extended two-fluid model applied to analysis of bubbly flow in multiphase rotodynamic pump impeller

Zhiyi YU, Guoyu WANG, Shuliang CAO

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1,   Pages 53-59 doi: 10.1007/s11465-009-0006-0

Abstract: This paper presents an extended two-fluid model based on the Navier-Stokes equations and the standardturbulence model, to simulate the three-dimensional air-water bubbly flow in turbo machinery.The discrete equations are solved using a developed two-phase semi-implicit method for pressure-linkedSimulation is then carried out for the pure liquid flow and air-water two-phase flow with the inlet gasComparison with experimental results shows the reliability and commonality of the numerical model.

Keywords： two-fluid model     multiphase rotodynamic pump     SIMPLEC algorithm     numerical simulation    

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Remediation of 2,4-dichlorophenol-contaminated groundwater using nano-sized CaO in a two-dimensionalscale tank

Frontiers of Environmental Science & Engineering 2020, Volume 15, Issue 5, doi: 10.1007/s11783-020-1381-3

Abstract:

• Nano CaO2 is evaluated as a remediation agent for 2,4-DCP contaminated groundwater.

Keywords： Calcium peroxide     2     4-DCP     Reaction zone     Fenton reaction    

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Investigation on the integral output power model of a large-scale wind farm

BAO Nengsheng, MA Xiuqian, NI Weidou

Frontiers in Energy 2007, Volume 1, Issue 1,   Pages 67-78 doi: 10.1007/s11708-007-0006-x

Abstract: The integral output power model of a large-scale wind farm is needed when estimating the wind farm sThe actual wind speed power model and calculation method of a wind farm made up of many wind turbineconsidering the multi-effects among the wind turbine units and certain assumptions, the incoming wind flow modelThe calculation algorithms and steps of the integral output power model of a large-scale wind farm areThe characteristics of a large-scale wind farm are also discussed.

Keywords： power model     actual     energy     large-scale     practical measurement    

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Modified landfill gas generation rate model of first-order kinetics and two-stage reaction

Jiajun CHEN , Hao WANG , Na ZHANG ,

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 3,   Pages 313-319 doi: 10.1007/s11783-009-0025-4

Abstract: The first-order kinetics and two-stage reaction (FKTSR) model of the LFG generation rate includes mechanismsof the nutrient balance for biochemical reaction in two main stages.The model calibration was then calculated by using the experimental data.The results suggested that the new model was in line with the experimental data.The new model is better able to explain the mechanisms involved in LFG generation.

Keywords： landfill gas (LFG)     generation rate model     first-order kinetics     two-stage reaction     outflow function    

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Sustainability performance analysis of environment innovation systems using a two-stage network DEA model

Frontiers of Engineering Management   Pages 425-438 doi: 10.1007/s42524-022-0205-5

Abstract: A two-stage data envelopment analysis (DEA) model is developed in this study to analyze the efficiency

Keywords： envelopment analysis     environmental efficiency     environmental innovation system     shared resources     two-stage    

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Dynamic Coordinated Management Model of Programme in Large-Scale Construction Company

Feng Guo,Yi-qi Chen,Yi-qing Cai

Frontiers of Engineering Management 2015, Volume 2, Issue 3,   Pages 287-292 doi: 10.15302/J-FEM-2015041

Abstract: Large-scale construction companies develop rapidly when facing more and more opportunities and challengestheory to programme management according to the need of changing the existing management mode in large-scaleconstruction companies, then puts forward the dynamic coordinated management model composed of the dynamic

Keywords： large-scale construction company     programme     dynamic coordinated management     model    

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A full-scale integrated-bioreactor with two zones treating odours from sludge thickening tank and dewatering

Jianwei Liu, Kaixiong Yang, Lin Li, Jingying Zhang

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 4, doi: 10.1007/s11783-017-0932-8

Abstract: A full-scale integrated-bioreactor consisting of a suspended zone and an immobilized zone was employedThe removal efficiencies of H S and NH differed between the two zones.

Keywords： Biological deodorization     Microbial characteristics     Ammonia     Hydrogen sulfide     Wastewater treatment plant    

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Developing a new model for simultaneous scheduling of two grand projects based on game theory and solvingthe model with Benders decomposition

Loghman PIRI, Vahidreza GHEZAVATI, Ashkan HAFEZALKOTOB

Frontiers of Engineering Management 2022, Volume 9, Issue 1,   Pages 117-134 doi: 10.1007/s42524-020-0115-3

Abstract: In this study, a mixed-integer programming model consisting of game theory and project scheduling isIn this model, two contractors in successive periods are entered into a step-by-step competition by theThis model can act dynamically in all circumstances during project implementation.Then, the results of our model are compared with those of the conventional models.The projects’ duration in our model is reduced by 22.2%.

Keywords： project scheduling     resource leveling between projects     constrained resources     game theory     Benders decomposition    

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A two-dimensional numerical model for eutrophication in Baiyangdian Lake

Xudong WANG, Shushen ZHANG, Suling LIU, Jingwen CHEN

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 815-824 doi: 10.1007/s11783-011-0383-6

Abstract: An eutrophication eco-dynamics model including the effects of reed resistance on flow was coupled withThe model simulates water quality constituents associated with eutrophication in the lake, includingThe values calculated by the calibrated model agree well with field data, including ammonia nitrogen,Deviations between model-simulated and observed values are discussed.As an ideal tool for environmental management of the lake, this model can be used to predict its water

Keywords： eutrophication     eco-dynamics     hydrodynamics     improved Water Quality Analysis Simulation Program (WASP) model    

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Large Scale Infrastructure Projects: The Art of Project or Change Management?

Geert Letens,Kurt Verweire,Peter De Prins

Frontiers of Engineering Management 2016, Volume 3, Issue 3,   Pages 197-202 doi: 10.15302/J-FEM-2016033

Abstract: of managing projects in the construction industry in general and an inevitable challenge for large scaleReflections on the application of this model in the construction industry and in large scale infrastructure

Keywords： large scale project management     organization development and change     batteries of change model    

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A multi-scale model for CO

G. X. WANG, X. R. WEI, V. RUDOLPH, C. T. WEI, Y. QIN

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1,   Pages 20-25 doi: 10.1007/s11705-009-0138-0

Abstract: This paper presents a multi-scale model to simulate the multicomponent gas diffusion and flow in bulkThe model is developed based on a bi-dispersed structure model by assuming that coal consists of microporousThe bi-disperse diffusion theory and the Maxwell-Stefan approach were incorporated in the model, providingIn the model, the counter diffusion process is numerically coupled with the flow of the mixture gasesThe model was validated by both experimental data from literature and our CO flush tests, and shows

Keywords： multi-scale model     gas transport     coal     coalbed methane     CO2 sequestration    

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Management and Practice of Large-Scale Modern Coal Enterprises

An Wang

Frontiers of Engineering Management 2014, Volume 1, Issue 1,   Pages 13-17 doi: 10.15302/J-FEM-2014004

Abstract: The construction of modernized mines based on "four orientations", that is, orientations of scale productionshifting to the West of China, will be exposed to new options and development in the layout, structure, model

Keywords： coal industry     sustainable development     the four-orientation model    

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Title Author Date Type Operation

Two-scale modeling of granular materials: A FEM-FEM approach

Yun-Zhu CAI, Yu-Ching WU

Journal Article

Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particleturbulence model

ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing

Journal Article

Large-scale model test study on the water pressure resistance of construction joints of karst tunnel

Journal Article

Extended two-fluid model applied to analysis of bubbly flow in multiphase rotodynamic pump impeller

Zhiyi YU, Guoyu WANG, Shuliang CAO

Journal Article

Remediation of 2,4-dichlorophenol-contaminated groundwater using nano-sized CaO in a two-dimensionalscale tank

Journal Article

Investigation on the integral output power model of a large-scale wind farm

BAO Nengsheng, MA Xiuqian, NI Weidou

Journal Article

Modified landfill gas generation rate model of first-order kinetics and two-stage reaction

Jiajun CHEN , Hao WANG , Na ZHANG ,

Journal Article

Sustainability performance analysis of environment innovation systems using a two-stage network DEA model

Journal Article

Dynamic Coordinated Management Model of Programme in Large-Scale Construction Company

Feng Guo,Yi-qi Chen,Yi-qing Cai

Journal Article

A full-scale integrated-bioreactor with two zones treating odours from sludge thickening tank and dewatering

Jianwei Liu, Kaixiong Yang, Lin Li, Jingying Zhang

Journal Article

Developing a new model for simultaneous scheduling of two grand projects based on game theory and solvingthe model with Benders decomposition

Loghman PIRI, Vahidreza GHEZAVATI, Ashkan HAFEZALKOTOB

Journal Article

A two-dimensional numerical model for eutrophication in Baiyangdian Lake

Xudong WANG, Shushen ZHANG, Suling LIU, Jingwen CHEN

Journal Article

Large Scale Infrastructure Projects: The Art of Project or Change Management?

Geert Letens,Kurt Verweire,Peter De Prins

Journal Article

A multi-scale model for CO

G. X. WANG, X. R. WEI, V. RUDOLPH, C. T. WEI, Y. QIN

Journal Article

Management and Practice of Large-Scale Modern Coal Enterprises

An Wang

Journal Article