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Simulation of fluid-structure interaction in a microchannel using the lattice Boltzmann method and size-dependent beam element on a graphics processing unit

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Chinese Physics B 2014年第8期23卷 389-395页

作者： vahid esfahanian Esmaeil Dehdashti Amir Mehdi Dehrouye-Semnani Department of Mechanical Engineering University of Tehran

Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The bottom boundary of the microchannel is simulated by size-dependent beam elements for the finite element method （FEM） based on a modified cou- ple stress theory. The lattice Boltzmann method （LBM） using the D2Q13 LB model is coupled to the FEM in order to solve the fluid part of the FSI problem. Because of the fact that the LBM generally needs only nearest neighbor information, the algorithm is an ideal candidate for parallel computing. The simulations are carried out on graphics processing units （GPUs） using computed unified device architecture （CUDA）. In the present study, the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam displacement. The numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element.

关键词： fluid-structure interaction graphics processing unit lattice Boltzmann method size-dependentbeam element

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Wavelet-based power management for hybrid energy storage system

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 779-790页

作者： Masoud MASIH-TEHRANI Mohammad Reza HA’IRI YAZDI vahid esfahanian Masoud DAHMARDEH Hassan NEHZATI Vehicle Dynamical Systems Research Laboratory School of Automotive EngineeringIran University of Science and TechnologyTehranIran School of Mechanical Engineering College of EngineeringUniversity of TehranTehranIran School of Automotive Engineering Iran University of Science and TechnologyTehranIran Vehicle Fuel and Environment Research Institute University of TehranTehranIran

A wavelet-based power management system is proposed in this paper with a combination of the battery and ultracapacitor(UC)hybrid energy storage system(HESS).The wavelet filter serves as a frequency-based filter for distributing the power between the battery and *** order to determine the optimal level of wavelet decomposition as well as the optimal activation power of the wavelet controller,an optimization procedure is *** proposed frequency-based power management system moderates the usage of battery current,consequently improving its *** with the conventional threshold-based power management systems,the proposed system has the advantage of enhanced battery and UC power management.A LiFePO4 battery is considered and its life loss is *** a case study,an electric motorcycle is evaluated in the federal test procedure(FTP)driving *** with a conventional energy storage system(ESS)and a state of available power(SoP)management systems,the results show an improvement for the battery lifetime by 115%and 3%,*** number of battery replacements is increased,and the energy recovery is *** 10-year overall costs of the proposed HESS strategy using wavelet are1500 dollars lower,compared with the ESS.

关键词： Wavelet filter Hybrid energy storage system(HESS) Power management system Ultracapacitor(UC) Lithium life loss model Battery Energy storage cost

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Fluid-Structure Interaction in Microchannel Using Lattice Boltzmann Method and Size-Dependent Beam Element

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Advances in Applied Mathematics and Mechanics 2014年第3期6卷 345-358页

作者： V.esfahanian E.Dehdashti A.M.Dehrouyeh-Semnani School of Mechanical Engineering University of TehranTehran 14395-515Iran

Fluid-structure interaction(FSI)problems in microchannels play prominent roles in many engineering *** present study is an effort towards the simulation of flow in microchannel considering *** boundary of the microchannel is assumed to be rigid and the bottom boundary,which is modeled as a Bernoulli-Euler beam,is simulated by size-dependent beam elements for finite element method(FEM)based on a modified couple stress *** lattice Boltzmann method(LBM)using D2Q13 LB model is coupled to the FEM in order to solve fluid part of FSI *** the present study,the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam *** numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element.

关键词： Fluid-structure interaction microchannel lattice Boltzmann method size-dependent beam element

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