检索结果-南通市图书馆

Direct simulation on two-phase flows with two-way coupling velocity model

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2001年第2期 71-77页

作者：石兴林建忠 China China Hangzhou Institute of Applied Engineering Department of Mechanics Hangzhou 310012 Hangzhou 310027 State Key Laboratory of Fluid Power and Control Zhejiang University

Based on the idea that not only the fluid mechanism but also the movement of the particles affects the character of the multiphase flow, a new two-way coupling model is developed. Then it is applied to the numerical simulation of the vortex pairing in a mixing layer and it is found that the particles impede the process of vortex pairing and reduce the Reynolds stress; the particle with relative small Stokes number moves with the flow and the particle with relative large Stokes number moves towards the edge, but the centrifugal tendency is delayed as compared with the oneway coupling model.

关键词： two-way coupling two-phase flows mixing layer.

Numerical simulation of the electromagnetic torques of PMSM with two-way magneto-mechanical coupling and nonuniform spline clearance in electric submersible pumping wells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第6期21卷 4417-4426页

作者： Xin-Fu Liu Chun-Hua Liu Ying Zheng Ji-Fei Yu Wei Zhou Meng-Xiao Wang Peng Liu Yi-Fei Zhou Key Lab of Industrial Fluid Energy Conservation and Pollution Control(Ministry of Education) Qingdao University of Technology College of Mechanical and Electronic Engineering China University of Petroleum(East China) Department of Chemical and Biochemical Engineering Western University CNOOC Research Institute Ltd. CNOOC

Clearance-fit(side-fit) spline joints are a key component in a permanent magnet synchronous motor(PMSM) in electric submersible pumping wells. The nonuniform spline clearance affects the output performance of a PMSM. A concept for energy conservation is optimized in this study to improve the modeling accuracy of electromagnetic torque. However, most existing computation models are one-way model with a magneto-mechanical simulation. In this study, a more accurate two-way coupling method is presented for simulating the electromagnetic and mechanical characteristics of PMSM. Additionally,importance should be attached to this two-way magneto-mechanical coupling methodology in an actual simulation. The coupled power, electrical and magnetic energy, and electromagnetic torque equations are solved iteratively until convergence for PMSMs with a segmented rotor and a non-segmented *** optimal electromagnetic torque is obtained for different rotor configurations with the change of temperatures and rotational speeds. The results show that the output performance and electromagnetic torque of the PMSM are seriously affected by the effects of two-way magneto-mechanical coupling and nonuniform spline clearance. The proposed two-way coupling model gives more reasonable predictions than other one-way models do, because the power transfer between the electrical and magnetic energy can be modeled more accurately. The self-centralizing performance of clearance-fit splines and the sensitivity to the radial clearance magnitude lead to the reduction of the electromagnetic torque for the PMSM. Additionally, the electromagnetic torques decrease with the enhanced rotor temperatures and rotational speeds. The best rotor temperature and rotational speed are chosen through a comparison of the experimental results, and then the optimal electromagnetic torque is provided to ensure the output performance of the PMSM in electric submersible pumping wells.

关键词： Permanent magnet synchronous motor two-way coupling Magneto-mechanical coupling Nonuniform spline clearance Electromagnetic torque

two-way SIMULATIONS FROM REGCM2 coupling WITH SUCROS IN THE HUANG-HUAI-HAI-PLAIN IN EAST CHINA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta meteorologica Sinica 2003年第2期17卷 164-177页

作者：周林宋帅王汉杰 Meteorological College P.L.A.University of Science and Engineering Climate and Environmental Research Center

A two-way coupling simulation from the NCAR's regional climate model REGCM2 (called R-2 hereafter) and the SUCROS model for crop growth developed by the Wageningen Agricultural University,the Netherlands (both models,when in combination,denoted as R/S) are carried out on the interactions between crops and atmosphere in the Huang-Huai-Hai Plain in East China. Evidence suggests that the R/S simulations can depict pretty well the dynamic biology-based interactions between the factors,revealing reasonably both the day-to-day variations in leaf area index (LAI) and land surface physics therein,and particularly the improvement of the simulation, independently by use of the R-2,of summer precipitation and surface temperature in the research *** a result,the present research is of significance to the further understanding of the interaction between the climate system and the terrestrial ecological systems.

关键词： two-way coupling atmosphere-vegetation interactions regional climate simulation Huang-Huai-Hai Plain

Fluid-Structure Interaction Analysis of Flexible Plate with Partitioned coupling Method

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2019年第6期33卷 713-722页

作者： W.Z.,Lim R.Y.,Xiao Faculty of Computing Engineering and the Built EnvironmentBirmingham City UniversityBirminghamB47XGUnited Kingdom Department of Urban Engineering School of The Built Environment and ArchitectureLondon South Bank UniversityBorough RoadLondonSE10AAUnited Kingdom

The development and rapid usage of numerical codes for fluid-structure interaction(FSI) problems are of great relevance to researchers in many engineering fields such as civil engineering and ocean engineering. This multidisciplinary field known as FSI has been expanded to engineering fields such as offshore structures, tall slender structures and other flexible structures applications. The motivation of this paper is to investigate the numerical model of two-way coupling FSI partitioned flexible plate structure under fluid flow. The adopted partitioned method and approach utilized the advantage of the existing numerical algorithms in solving the two-way coupling fluid and structural interactions. The flexible plate was subjected to a fluid flow which causes large deformation on the fluid domain from the oscillation of the flexible plate. Both fluid and flexible plate are subjected to the interaction of load transfer within two physics by using the strong and weak coupling methods of MFS and Load Transfer Physics Environment, respectively. The oscillation and deformation results have been validated which demonstrate the reliability of both strong and weak method in resolving the two-way coupling problem in contribution of knowledge to the feasibility field study of ocean engineering and civil engineering.

关键词： fluid-structure interaction flexible plate structure two-way coupling partitioned method numerical simulation

A novel incompressible finite-difference lattice Boltzmann equation for particle-laden flow

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2005年第6期21卷 574-581页

作者： Sheng Chen Zhaohui Liu Baochang Shi Zhu He Chuguang Zheng State Key Laboratory of Coal Combustion Hua Zhong University of Science and Technology Wuhan 430074 China

In this paper, we propose a novel incompressible finite-difference lattice Boltzmann Equation （FDLBE）. Because source terms that reflect the interaction between phases can be accurately described, the new model is suitable for simulating two-way coupling incompressible multiphase flow The 2-D particle-laden flow over a backward-facing step is chosen as a test case to validate the present method. Favorable results are obtained and the present scheme is shown to have good prospects in practical applications.

关键词： Finite difference lattice Boltzmann equation two-way coupling Multiphase flow Incompressible

A Numerical Study on the Water Impact of the Rigid/Elastic Box-Like Structure

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2023年第2期37卷 333-342页

作者： YANG Jian SUN Zhao-chen LIANG Shu-xiu State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Recent damages to the box-like structures caused by wave slamming have made it necessary to study the impact problems of this kind of structure. This paper showed findings from numerical simulations of the rigid/elastic structures, aiming to gain insights into the characteristics of the problem. The results of the rigid cases showed the significance of air compressibility during the impact process, while the slamming phenomena became quite different without the effect. In the elastic cases, the trapped air made the structure vibrate at frequencies much smaller than its eigenfrequencies. Besides, the structural deformation made it easy for the trapped air to escape outwards, which weakened the air cushioning effect, especially at high impact velocities. The above analysis gives the results when the structural symmetry axis was vertical to the water(vertical impacts). In addition, the results were given when the axis was oblique to the water(oblique impacts). Compared with the vertical cases, the impact phenomena and structural response showed asymmetry. This work used the computational fluid dynamics(CFD) method to describe fluid motion and the finite element method(FEM) for the deformable structure. A two-way coupling approach was used to deal with the fluid-structure interaction in the elastic cases.

关键词： water impact fluid-structure interaction air compressibility box-like structures two-way coupling

Effect of Stokes number on energy modulation of the fluid in turbulent particle-laden channel flows

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2022年第3期34卷 510-521页

作者： Zhi-feng Wu Jian-zhao Wu Bo-fu Wang Zhi-ming Lu Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai200072China

The effect of Stokes number on the kinetic energy(KE)budget in particle-laden turbulent channel flows is examined by conducting two-way coupled direct numerical simulations using the Eulerian-Lagrangian *** friction Reynolds number of the single phase channel flow is Re_(τ)=180,the particle mass loading and volume fraction areφ_(m)=0.2,φ_(v)≈10−4,and the Stokes numbers range from St^(+)=14–*** statistics show that due to the presence of solid particles,the mean velocity is reduced in the vicinity of the wall but enhanced in the outer region,and the off-streamwise intensity of fluctuated velocity and the Reynolds stress are reduced in the whole *** analysis on the budgets of turbulent kinetic energy(TKE)finds that the presence of particles induces a significant reduction on both the production and dissipation *** increasing Stokes number St^(+),both the production and dissipation rates exhibit non-monotonical trends,i.e.,both initially decrease for St^(+)*** suggests that the particle-induced suppression on TKE production and dissipation is the strongest nearly at St^(+)=*** is also found that particles act as an additional sink/source term in the budgets of both mean-flow kinetic energy(MKE)and *** addition,we investigate the influence of St^(+)on the“zero point”which indicates the balance of exchanging energy between the particle and fluid *** is shown that with increasing St^(+),the“zero point”moves toward the wall,suggesting that the position of perfect following between particle and fluid is closer to the wall with larger St^(+).The present results reveal the Stokes number effects on the spatial transport mechanisms of MKE,TKE in turbulent channel flows laden with inertial particles.

关键词： Particle-laden flows two-way coupling Stokes numbers kinetic energy budgets

Numerical Simulation of Erosion-Corrosion in the Liquid-Solid two-Phase Flow

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2000年第4期8卷 347-355页

作者：张政程学文郑玉贵柯伟姚治铭 CollegeofChemicalEngineering BeijingUniversityofChemicalTechnologyBeijing100029China EnvironmentalProtectionResearchInstitute BeijingResearchInstituteofChemicalIndustryBeijing100013China InstituteofCorrosionandProtectionofMetals ChineseAcademySciencesShenyang110015China

Erosion-corrosion of liquid-solid two-phase flow occurring in a pipe with sudden expansion in cross-section is numerically simulated in this paper. The global model for erosion-corrosion process includes three main components: the liquid-solid two-phase flow model, erosion model and corrosion model. The Eulerian-Lagrangian approach is used to simulate liquid-solid two-phase flow, while the stochastic trajectory model was adopted to obtain properties of particle phase. two-way coupling effect between the fluid and the particle phase is considered in the model. The accuracy of the models is tested by the data in the reference. The comparison shows that the model is basically correct and feasible.

关键词： erosion-corrosion liquid-solid two-phase flow stochastic trajectory model two-way coupling

A high-efficiency aerothermoelastic analysis method

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第6期57卷 1111-1118页

作者： WAN ZhiQiang WANG YaoKun LIU YunZhen YANG Chao School of Aeronautic Science and Engineering Beihang University

In this paper,a high-efficiency aerothermoelastic analysis method based on unified hypersonic lifting surface theory is *** method adopts a two-way coupling form that couples the structure,aerodynamic force,and aerodynamic thermo and heat *** aerodynamic force is first calculated based on unified hypersonic lifting surface theory,and then the Eckert reference temperature method is used to solve the temperature field,where the transient heat conduction is solved using Fourier’s law,and the modal method is used for the aeroelastic ***,flutter is analyzed based on the p-k *** aerothermoelastic behavior of a typical hypersonic low-aspect ratio wing is then analyzed,and the results indicate the following:(1)the combined effects of the aerodynamic load and thermal load both deform the wing,which would increase if the flexibility,size,and flight time of the hypersonic aircraft increase;(2)the effect of heat accumulation should be noted,and therefore,the trajectory parameters should be considered in the design of hypersonic flight vehicles to avoid hazardous conditions,such as flutter.

关键词： aerothermoelastic two-way coupling unified hypersonic lifting surface theory piston theory flutter