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Numerical simulation of biodiesel fuel combustion and emission characteristics in a direct injection

Yi REN, Ehab ABU-RAMADAN, Xianguo LI,

Frontiers in Energy 2010, Volume 4, Issue 2,   Pages 252-261 doi: 10.1007/s11708-010-0036-7

Abstract: physical and chemical properties of biodiesel fuels on the combustion process and pollutants formation in Direct) engine are investigated numerically by using multi-dimensional Computational Fluid Dynamics (CFD) simulation

Keywords： biodiesel     diesel engine     CFD simulation     combustion     pollutant formation    

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GIS-based numerical simulation of Amamioshima debris flow in Japan

Jian WU, Guangqi CHEN, Lu ZHENG, Yingbin ZHANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 206-214 doi: 10.1007/s11709-013-0198-6

Abstract: Then the simulation results can be displayed by GIS and easily used to form the hazard maps.Finally, the numerical model coupled with GIS is applied to simulate the debris flow occurred on Oct.The simulation reproduces the movement, erosion and deposition.

Keywords： debris flow     numerical simulation     GIS     movement     erosion     deposition    

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Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers

Dongqiang LEI, Yucong REN, Zhifeng WANG

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 1048-1059 doi: 10.1007/s11708-020-0670-7

Abstract: A 2-D heat transfer model is established by using the direct simulation Monte Carlo method for rarefiedThe numerical results conform to the experimental results, and show the temperature of the glass envelope

Keywords： parabolic trough receiver     vacuum annulus     rarefied gas     DSMC (direct simulation Monte Carlo)     heat loss    

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Vortex-induced vibration of stay cable under profile velocity using CFD numerical simulation method

Wenli CHEN, Hui LI,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 4,   Pages 357-363 doi: 10.1007/s11709-009-0060-z

Abstract: A stay cable with the inclined angle of 30° is used as the numerical model.infinitely long cable under a uniform flow in water (i.e., without consideration of profile) obtained by directnumerical simulation.

Keywords： stay cable     fluid-structure interaction     numerical simulation     vortex-induced vibration    

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Analysis of Coherent Structures in a Turbulent Boundary Layer With Pressure Gradients

Lu Lipeng,Li Zhaorui

Strategic Study of CAE 2002, Volume 4, Issue 11,   Pages 50-56

Abstract:

By using the method of direct numerical simulation, the coherent structures in the wall region of

Keywords： coherent structures     turbulent boundary layer     pressure gradients     direct numerical simulation (DNS)    

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Numerical simulation of benzene transport in shoreline groundwater affected by tides under different

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 5, doi: 10.1007/s11783-022-1540-9

Abstract:

● An approach for assessing the transport of benzene on the beach was proposed.

Keywords： Numerical simulation     Benzene     Transport and fate     Shoreline     Groundwater     Tide    

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Numerical simulation of multi-body floating piers to investigate pontoon stability

Mostafa Shahrabi, Khosrow Bargi

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 325-331 doi: 10.1007/s11709-013-0209-7

Abstract: For numerical simulation, three types of piers are used: passenger piers, light-cargo piers and semi-heavy-cargo

Keywords： coastal structures     numerical simulation     floating pier     rigid pontoons     stability    

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The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient

Zhang Qiang,Lu Lipeng

Strategic Study of CAE 2003, Volume 5, Issue 11,   Pages 47-50

Abstract:

The evolution of coherent structures in the wall region of a turbulent boundary layer under adverse pressure gradients was studied by using DNS method. The motions of the second and the fourth quadrant were analyzed. The results show that to the shear stress, the contribution of sweep motions is stronger than that of ejections under adverse pressure gradient. And the sweeps contribute to the transport of shear-stress and kinetic energy of turbulence more strongly than the ejections under adverse pressure gradient.

Keywords： coherent structures     turbulent boundary layer     adverse pressure gradients     direct numerical simulation    

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Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation

Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 284-295 doi: 10.1007/s11708-019-0613-3

Abstract: At different direct normal irradiance (DNI), any single optimal result may not be suitable enough forThis study constructed a 3-D numerical model of cylindrical cavity receiver with DNI variation.The simulation results show that for a particular DNI in the range of 400 W/m to 800 W/m , there exists

Keywords： cylindrical cavity receiver     3-D numerical simulation     geometric optimization     direct normal irradiation    

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Migration of ammonium nitrogen in ion-absorbed rare earth soils during and post mining: a column study and numericalsimulation analysis

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 8, doi: 10.1007/s11783-023-1702-4

Abstract:

● Column experiments with an inclined slope were applied to simulate NH4–N transport.

Keywords： Ion-absorbed rare earth     Ammonium nitrogen transport     HYDRUS-2D     Numerical simulation    

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Stable expression and control parameters in the numerical simulation of unsaturated flow

Zhiyuan ZHANG; Xu LI; Yongkang WU; Xiaokang LI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12,   Pages 1501-1514 doi: 10.1007/s11709-022-0893-2

Abstract: This study evaluated the numerical stability of two different forms of the Richards’ equation.hydraulic conductivity, initial condition, and air-entry pressure have a higher sensitivity to the simulationMoreover, their correctness needs to be guaranteed first in numerical simulations.The research findings can provide a helpful reference for improving the reliability of numerical simulations

Keywords： Richards’ equation     sensitivity analysis     unsaturated soil     hydraulic diffusivity     seepage simulation    

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Numerical investigation of the chemical and electrochemical characteristics of planar solid oxide fuelcell with direct internal reforming

Yuzhang WANG, Shilie WENG, Yiwu WENG

Frontiers in Energy 2011, Volume 5, Issue 2,   Pages 195-206 doi: 10.1007/s11708-011-0148-8

Abstract: A fully three-dimensional mathematical model of a planar solid oxide fuel cell (SOFC) with complete direct

Keywords： planar solid oxide fuel cell (SOFC)     direct internal reforming     chemical reaction     methane     electrochemical    

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Three-dimensional numerical simulation of the basic pulse tube refrigerator

DING Wenjing, GONG Liang, HE Yaling, TAO Wenquan

Frontiers in Energy 2008, Volume 2, Issue 1,   Pages 48-53 doi: 10.1007/s11708-008-0008-3

Abstract: A three-dimensional physical and numerical model of the basic pulse tube refrigerator (PTR) was developed

Keywords： refrigeration mechanism     three-dimensional     compressible     numerical     understanding    

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Numerical study of ignition mechanism of n-heptane direct injection compression-ignition engine

Xiaoping GUO, Zhanjie WANG,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 432-439 doi: 10.1007/s11708-009-0050-9

Abstract: A detailed chemical dynamical mechanism of oxidation of n-heptane was implemented into kiva-3 code to study the ignition mechanism of a high-temperature, high-pressure, three-dimensional-space, transient turbulent, non-homogeneous, mono-component fuel in the engine. By testing the quantity of the heat released by the chemical reaction within the cylinder cell, the elementary reaction showing an obvious increase in the cell temperature was defined as ignition reaction and the corresponding cell as ignition position. The main pathway of the ignition reaction was studied by using the reverse deducing method. The result shows that the ignition in the engine can be divided into low-temperature ignition and high-temperature ignition, both of which follow the same rule in releasing heat, called the impulse heat releasing feature. Low-temperature ignition reaction, whose ignition reaction is c5h9o1-4=ch3cho+c3h5-a, follows the oxidation mechanism, while high-temperature ignition reaction, whose ignition reaction is c2h3o1-2=ch3co, follows the decomposition mechanism. No matter which ignition it is in, the chemical reaction that restrains the ignition reaction from lasting is the deoxidization reaction of alkylperoxy radicals.

Keywords： compression-ignition engine     ignition mechanism     elementary reaction     n-heptane    

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Method of internal 3D flow field numerical simulation for hydrodynamic torque converter

SHANG Tao, ZHAO Dingxuan, ZHANG Yuankun, GUO Xiangen, SHI Xiangzhong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 1,   Pages 86-90 doi: 10.1007/s11465-008-0012-7

Abstract: performance of a hydrodynamic torque converter and thoroughly understand the trait of inside flow, a numericalsimulation method of internal 3D flow for the three-element centrifugal hydrodynamic torque converter

Keywords： velocity distribution     calculation     numerical simulation     three-element centrifugal     converter    

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Title Author Date Type Operation

Numerical simulation of biodiesel fuel combustion and emission characteristics in a direct injection

Yi REN, Ehab ABU-RAMADAN, Xianguo LI,

Journal Article

GIS-based numerical simulation of Amamioshima debris flow in Japan

Jian WU, Guangqi CHEN, Lu ZHENG, Yingbin ZHANG

Journal Article

Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers

Dongqiang LEI, Yucong REN, Zhifeng WANG

Journal Article

Vortex-induced vibration of stay cable under profile velocity using CFD numerical simulation method

Wenli CHEN, Hui LI,

Journal Article

Analysis of Coherent Structures in a Turbulent Boundary Layer With Pressure Gradients

Lu Lipeng,Li Zhaorui

Journal Article

Numerical simulation of benzene transport in shoreline groundwater affected by tides under different

Journal Article

Numerical simulation of multi-body floating piers to investigate pontoon stability

Mostafa Shahrabi, Khosrow Bargi

Journal Article

The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient

Zhang Qiang,Lu Lipeng

Journal Article

Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation

Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO

Journal Article

Migration of ammonium nitrogen in ion-absorbed rare earth soils during and post mining: a column study and numericalsimulation analysis

Journal Article

Stable expression and control parameters in the numerical simulation of unsaturated flow

Zhiyuan ZHANG; Xu LI; Yongkang WU; Xiaokang LI

Journal Article

Numerical investigation of the chemical and electrochemical characteristics of planar solid oxide fuelcell with direct internal reforming

Yuzhang WANG, Shilie WENG, Yiwu WENG

Journal Article

Three-dimensional numerical simulation of the basic pulse tube refrigerator

DING Wenjing, GONG Liang, HE Yaling, TAO Wenquan

Journal Article

Numerical study of ignition mechanism of n-heptane direct injection compression-ignition engine

Xiaoping GUO, Zhanjie WANG,

Journal Article

Method of internal 3D flow field numerical simulation for hydrodynamic torque converter

SHANG Tao, ZHAO Dingxuan, ZHANG Yuankun, GUO Xiangen, SHI Xiangzhong

Journal Article