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Verification of Tire Hydroplaning Phenomenon Using Coupled FSI Simulation by CFD and FEM 被引量:1
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作者 Hyun Chul Jung Mi Dum Jung +1 位作者 Kyoung Moon Jeong Kyunghoon Lee 《Open Journal of Applied Sciences》 2020年第7期417-431,共15页
<span style="font-family:Verdana;">Hydroplaning phenomenon is one of the major factors that must be considered to ensure safe driving on wet road surfaces. In this paper, the approach to numerical simu... <span style="font-family:Verdana;">Hydroplaning phenomenon is one of the major factors that must be considered to ensure safe driving on wet road surfaces. In this paper, the approach to numerical simulation of the physical hydroplaning characteristics using patterned tire is described. A detailed 3-D patterned tire model is constructed by in-house modeling program and the water flow is considered as incompressible. The complex tire material compositions are effectively modeled using composites, and rubber properties generalize the Mooney-Rivlin model. The finite element method (FEM) and the advanced finite volume method (FVM) are used for structural and for fluid-tire interaction analysis, respectively. Performance prediction of hydroplaning via coupling of computational fluid dynamics (CFD) and FEM has delivered a detailed insight into the local mechanisms and root causes of hydroplaning. Numerical examples were verified by comparing the experimental test results and it is confirmed to indicate similar correlation tendency and high reliability. The effect of driving velocity, pattern groove size, and pattern direction on hydroplaning phenomenon of tire is discussed and logical results were obtained.</span> 展开更多
关键词 TIRE HYDROPLANING Finite Element Method Computational Fluid Dynamic Fluid Structure Interaction
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SIMULATION, ANALYSIS AND OPTIMIZATION OF CONTAINER TERMINALS PROCESSES
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作者 AGOSTINO BRUZZONE FRANCESCO LONGO +2 位作者 LETIZIA NICOLETTI ELEONORA BOTTANI ROBERTO MONTANARI 《International Journal of Modeling, Simulation, and Scientific Computing》 EI 2012年第4期1-20,共20页
The freight logistics includes all the processes needed to supply industry,retailers and wholesalers and final customers with goods.Such processes generate a flow of goods that,in the global supply chain,mainly relies... The freight logistics includes all the processes needed to supply industry,retailers and wholesalers and final customers with goods.Such processes generate a flow of goods that,in the global supply chain,mainly relies on the activities carried out within worldwide container terminals.In this paper,the authors present a simulation model of a real container terminal.After some preliminary analyses,the simulation model is first used with Design of Experiments and Analysis of Variance to investigate the effects of different resources allocations(i.e.,number of forklifts and tractors)and some parameters(i.e.,inter-arrival times,container unloading time)on the container terminal performances in terms of total number of handled containers per day.Then,based on the results achieved through the Design of Experiments and Analysis of Variance,the simulation model is used with genetic algorithms to carry out a range allocation optimization on berth assignment to incoming ships and number of tractors serving each quay crane.The aim of the optimization is the minimization of the average time spent by each ship in the port area(decreasing,as consequence,costs and increasing service level provided to final customers). 展开更多
关键词 Container terminals supply chain node SIMULATION OPTIMIZATION genetic algorithms analysis of variance.
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Optical detection of quantum geometric tensor in intrinsic semiconductors
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作者 Zhi Li Shengli Zhang +5 位作者 Takami Tohyama Xiufeng Song Yu Gu Toshiaki Iitaka Haibin Su Haibo Zeng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2021年第10期82-87,共6页
Quantum geometric tensor, including a symmetric real part defined as quantum metric and an antisymmetric part defined as Berry curvature, is essential for understanding many phenomena. In this study, we investigated t... Quantum geometric tensor, including a symmetric real part defined as quantum metric and an antisymmetric part defined as Berry curvature, is essential for understanding many phenomena. In this study, we investigated the photogalvanic efect of semiconductors with time-reversal-invariant and spatial inversion symmetries using the quantum kinetic equation. We concluded that the integral of the symmetric(antisymmetric) part of quantum geometric tensor on the equal energy surface in momentum space, satisfying the resonance condition, is related to the generation rate of carriers in semiconductors under linearly(circularly) polarized light. Under additional bias voltage, the dc photocurrent is proportional to the bias voltage. Our study provided an alternative interpretation for the photogalvanic efect in the view of quantum geometric tensor. Additionally, it classified the intrinsic diference between linearly and circularly polarized optical fields. 展开更多
关键词 quantum geometry photovoltaic efect nonlinear optics
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