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Numerical simulation research on multiphase flow of aviation centrifugal pump based on openfoam

Chinese Journal of Aeronautics 2024年第4期37卷 256-275页

作者： Xianwei LIU Jiangfeng FU Junjie YANG Dewen YIN Zhenhua ZHOU Huacong LI College of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Norinco Group Testing and Research Institute Huayin 714200China AECC Xi’an Engine Control Technology Co.Ltd. Xi’an 710077China AECC Guizhou Honglin Aero Engine Control Technology Co.Ltd. Guiyang 550009China

This paper aims to tackle the calculation efficiency problem raised in the cavitation-flow simulation of the aviation centrifugal pump due to the fading-away interface resulting from the dissipation of numerics used in the phase-change control equation for unstructured-grid multiphase flow,and due to the limitation of flow time-step in whole flow regimes,the control equation of vapor–liquid two-phase flow considering cavitation mass transport is established firstly,modifying the momentum equation by introducing the surface tension,and adding the artificial convective flow to the phase equation to solve the numerical dissipation ***,in consideration of the local time step principle and based on the multi-dimensional general limiter algorithm with explicit solutions under the openfoam platform,a solution method of steady-state VOF (Volume of Fluid) model considering cavitation two-phase change is constructed,and the feasibility of this method is verified by NACA hydrofoil and NASA flat plate ***,based on the platform developed,the cavitation performance of an aviation centrifugal pump inducer is *** research results show that the error of the calculated cavitation pressure distribution for NACA hydrofoil between the simulation test and the experimental-test is less than 5%,and the maximum error of calculated cavitation number at pump head dropping for NASA high-speed flat plate inducer between the simulation test and the experimental-test is 2.1%.The cavitation area observed in the simulation test is the same as that obtained in the high-speed photography *** on the openfoam simulation method,the position of pump head dropping of the fuel centrifugal pump can be accurately *** error of the calculated cavitation number at pump head dropping between the simulation test and the experimental test is about 3.7%,showing high calculation accuracy.

关键词： Aero engine Fuel centrifugal pump Multiphase flow openfoam Volume of fluid

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A numerical piston-type wave-maker toolbox for the open-source library openfoam

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Journal of Hydrodynamics 2019年第4期31卷 800-813页

作者： Dong-xu Wang Jia-wen Sun Jin-song Gui Zhe Ma De-zhi Ning Ke-zhao Fang Department of Ocean and Civil Engineering Dalian Ocean University Dalian 116023 China National Marine Environment Monitoring Center State Oceanic Administration Dalian 116023 China Deepwater Engineering Research Center Dalian University of Technology Dalian 116024 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

A novel numerical piston-type wave-maker toolbox for the openfoam is developed and demonstrated in this paper. This toolbox is implemented in C++ for improving the solutions of nonlinear wave problems in the field of hydrodynamics. As a toolbox that generates waves using the piston-type method only, it contains several frequently used functions, including the generation and the absorption of waves of various forms, an active absorption system and the porous media flow. Furthermore, to illustrate the operability of the toolbox, some validations and applications are presented, including the regular waves, the irregular waves, and the solitary waves. In each case, a satisfactory agreement is obtained in comparison with the published experimental or theoretical results,so this toolbox may be applied with a considerable confidence.

关键词： Piston-type wave-maker openfoam nonlinear wave hydrodynamics

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Impacts of uneven surface heating of an ideal street canyon on airflows and indoor ventilation:Numerical study using openfoam coupled with EnergyPlus

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Building Simulation 2022年第2期15卷 265-280页

作者： Yuya Xiong Hong Chen School of Architecture and Urban Planning Huazhong University of Science and TechnologyWuhanHubei430000China

In the daytime,building facades and ground surfaces are heated by solar radiation,and the resulting buoyancy can change the flow field inside street *** this study,the impacts of uneven and time-varying heating of surfaces inside an ideal urban street canyon(aspect ratio=1)on single-sided indoor natural ventilation are *** work introduces a methodology for a numerical approach based on the coupling between a computational fluid dynamics(CFD)model and an energy balance ***,EnergyPlus is employed to calculate the time-varying and uneven surface *** are performed at four typical study times(05:00,09:00,15:00,20:00)during a hot summer day(July 15)in Wuhan,***,the surface temperature results are transferred to openfoam for CFD *** inlet wind velocities(U_(ref))are *** results show that for a relatively strong ambient wind(U_(ref)=3 m/s),the buoyancy caused by surface heating does not significantly change the airflow structures and indoor ventilation compared with those in the isothermal ***,for a weak ambient wind(U_(ref)=0.5 m/s),the airflow structures inside the street canyon vary with the time of ***,the average air exchange rate(ACH)differs by-25.0% to 15.9%compared with that in the isothermal case,and the ACH of a single room increases by up to 2710%.The results indicate that the surface-heating-induced buoyancy is nonnegligible and should be carefully investigated,especially for weak ambient winds.

关键词： uneven surface temperature indoor ventilation urban canyon openfoam EnergyPlus

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Numerical Analysis of Unsteady Natural Convection Flow and Heat Transfer in the Existence of Lorentz Force in Suddenly Expanded Cavity Using openfoam

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Journal of Thermal Science 2020年第6期29卷 1513-1530页

作者： SINGH Ranjit J. GOHIL Trushar B. Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India

The present study reveals the significance of the magnetic field or Lorentz force on the unsteady natural convection flow and heat transfer in the suddenly expanded *** Lorentz force based magnetohydrodynamics(MHD)solver using electric potential formulation coupled with the energy equation by the means of Boussinesq approximation is developed in the open-source CFD tool *** unsteady flow is generated by the buoyancy force keeping the Rayleigh number(Ra)at 109,at the fixed Prandtl number(Pr)of *** effects of the magnetic field on the flow and heat transfer are explained for various orientations of magnetic field(Bx,B45,and By)in terms of Hartmann number(Ha=0,50,100,300 and 500).The increase in the magnetic field increases the strength of the Lorentz force,which regulates the flow pattern and suppresses down the unsteady nature of flow and heat transfer into the *** is perceived that the average Nusselt number decreases as the intensity of Bx and B45 magnetic field ***,for By magnetic field the average Nusselt number increases up to Ha of 100 as compared to the non-MHD case(Ha=0).The distribution of Lorentz force in the domain plays a significant role in the governing of the fluid flow and heat transfer.

关键词： openfoam Lorentz force Boussinesq approximation natural convection

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Numerical simulations of propeller cavitation flows based on openfoam

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Journal of Hydrodynamics 2020年第6期32卷 1071-1079页

作者： Min-sheng Zhao Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

In order to study the cavitation and hydrodynamic characteristics of propeller under uniform and non-uniform flows,numerical investigations are performed using interPhaseChangeDyMFoam in the open source computational fluid dynamics(CFD)software platform openfoam with Schnerr-Sauer cavitation *** simulation results can be used as a reference to evaluate the working ability of a propeller in case of actual navigation.A new grid encryption method is adopted in the research to better capture the existence of vortex cavitation at the propeller *** method of function input is carried out in the study to simulate the condition of non-uniform flow and reduce the calculation *** unsteady dynamics are predicted by the Reynolds-averaged Navier-Stokes(RANS)method with a modified shear stress transport(SST)k−ωturbulence *** numerical results of the propeller such as cavitation shape and pressure distribution under uniform and non-uniform flow are analyzed and compared with each other.

关键词： openfoam E779A propeller cavitation non uniform flow

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A Study on High Subsonic Airfoil Flows in Relatively High Reynolds Number by Using openfoam

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Journal of Thermal Science 2014年第2期23卷 133-137页

作者： Shinichiro NAKAO Masashi KASHITANI Takeshi Miyaguni Yutaka YAMAGUCHI Department of Mechanical Engineering Nagasaki Institute of Applied Science536 Aba-MachiNagasaki851-0193JAPAN Department of Aerospace Engineering National Defense Academy1-10-20 HashirimizuYokosuka239-8686JAPAN

In the present study,numerical calculations of the flow-field around the airfoil model are performed by using the openfoam in high subsonic *** airfoil model is NACA *** maximum thickness is 10 % of the chord *** SonicFOAM and the RhoCentralFOAM are selected as the solver in high subsonic *** grid point is 158,000 and the Mach numbers are 0.277 and 0.569 *** CFD data are compared with the experimental data performed by the cryogenic wind tunnel in the *** results are as *** numerical results of the pressure coefficient distribution on the model surface calculated by the SonicFOAM solver showed good agreement with the experimental data measured by the cryogenic wind *** the data calculated by the SonicFOAM have the capability for the quantitative comparison of the experimental data at low angle of attack.

关键词： openfoam High Subsonic Flows Cryogenic Wind Tunnel Airfoil

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Instability and sensitivity analysis of flows using openfoam~

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Chinese Journal of Aeronautics 2016年第2期29卷 316-325页

作者： Liu Qiong F. Gomez J.M. Perez V. Theofilis School of Aeronautics Universidad PolitOcnica de Madrid Plaza Cardinal Cisneros 3 Madrid E-28040 Spain Department of Mechanical and Aerospace Engineering Monash University Victoria 3800 Australia

The present contributions deal with the development and implementation of the direct and adjoint incompressible Navie-Stokes equations in a matrix-free time-stepping context making use of the open-source openfoam~ （open source field operation and manipulation） C ＋＋ tool- box. It is shown that a few minor modifications in the source code can enable these multi-purpose computational fluid dynamics （CFD） solvers to carry out global instability analysis of three- dimensional flows of engineering interest, exploiting all additional capabilities of such codes. The strength of this methodology is demonstrated through the analysis of an interesting selection of ooen and wall-bounded flows.

关键词： Adjoint-based analysis Computational fluid dynam-ics Flow instability openfoam Time-stepping method

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Study on the thermo-hydraulic behaviors of the new-pattern fuel assembly in lead-based fast reactors based on openfoam

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Nuclear Science and Techniques 2024年第10期35卷 250-263页

作者： Yun-Xiang Li Run-Sheng Yang Yue Li Xing-Kang Su Zi-Nan Huang Lu Meng Song Li Bin Xi You-Peng Zhang Lu Zhang Wei Jiang Institute of Modern Physics Fudan UniversityShanghai 200433China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

To improve the heat transfer efficiency of the coolant in lead-based fast reactors,this study optimized the configuration and rotational direction of the spacer wires in fuel assemblies to design a new-pattern fuel *** study conducted detailed comparisons between traditional and new pattern fuel assembly rod bundles utilizing the open-source computational fluid dynamics platform,*** results indicated that the new design may significantly reduce the pressure drop along the rod bundle,which is beneficial for lowering the pressure ***,this new design improved coolant mixing in the subchannels,which facilitated a more uniform temperature distribution and lower thermal gradients at the assembly *** factors collectively reduced the thermal fatigue and creep in nearby internal ***,the newpattern fuel assembly proposed in this study may have better heat transfer performance,thereby enhancing the Integrated Thermal-Hydraulic Factor by 48.2% compared to the traditional pattern.

关键词： Spacer wires Enhanced coolant mixing openfoam CFD simulations

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CFD-PBE simulation of a bubble column in openfoam

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1773-1784页

作者： Jingcai Cheng Qian Li Chao Yang Yongqiang Zhang Zaisha Mao CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China SINOPEC Research Institute of Petroleum Processing Beijing 100083China

A general CFD-PBE(computational fluid dynamics-population balance equation) solver for gas–liquid poly-dispersed flows of both low and high gas volume fractions is developed in openfoam(open-source field operation and manipulation) in this work. Implementation of this solver in openfoam is illustrated in detail. The PBE is solved with the cell average technique. The coupling between pressure and velocity is dealt with the transient PIMPLE algorithm, which is a merged PISO-SIMPLE(pressure implicit split operator-semi-implicit method for pressure-linked equations) algorithm. Results show generally good agreement with the published experimental data, whereas the modeling precision could be improved further with more sophisticated closure models for interfacial forces, the models for the bubble-induced turbulence and those for bubble coalescence and *** results also indicate that the PBE could be solved out the PIMPLE loop to save much computation time while still preserving the time information on variables. This is important for CFD-PBE modeling of many actual gas–liquid problems, which are commonly high-turbulent flows with intrinsic transient and 3 D characteristics.

关键词： Population balance equation (PBE) Multiphase Bubble column openfoam Computational fluid dynamics (CFD)

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Large eddy simulation of cavitating flows with dynamic adaptive mesh refinement using openfoam

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Journal of Hydrodynamics 2020年第2期32卷 398-409页

作者： Lin-min Li Dai-qing Hu Yu-cheng Liu Bi-tao Wang Chen Shi Jun-jie Shi Chang Xu College of Energy and Electrical Engineering Hohai UniversityNanjing211100China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China Anhui Jinzhai Pumped Storage Power Co. LtdLu’an237300China

Cavitating flows are dominated by large gradients of physical properties and quantities containing complicated interfacial structures and lots of multi-scale eddies that need to be accurately characterized using a high-resolution *** present work,within openfoam,proposes an effective modeling framework using the large eddy simulation(LES)approach along with the volume of fluid(VOF)method to simulate the two-phase flow system and applies the Schnerr-Sauer model to calculate the mass-transfer rate between water and *** adaptive mesh refinement(AMR)which is a powerful tool for allocating high-resolution grids only to the region of the greatest concern is adopted for improving the solution of interfacial *** effect of grid size is firstly investigated and the time-averaged quantities are verified against the experimental data,and then simulations of cavitating flows are successfully achieved to precisely characterize the features of cavitation with automatically and dynamically refining the *** the refinement only takes place in the interfacial region,high-precision simulations can be achieved with limited computational resources,and the method shows promising prospects for modeling of the multi-scale,time-critical and computationally intensive cavitating flows.

关键词： Cavitating flows large eddy simulation(LES) multi-scale adaptive mesh refinement(AMR) openfoam

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