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Development of a coupled supersonic inlet-fan Navier–Stokes simulation method

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Chinese Journal of Aeronautics 2018年第2期31卷 237-246页

作者： Qiushi LI Yongzhao LYU Tianyu PAN Da LI Ha'nan LU Yifang GONG National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeoing 100191 China School of Energy and Power Engineering Beihang University Beijing 100083 China Collaborative Innovation Center of Advanced Aero-Engine Beihang University Beijing 100083 China GL-Turbo Compressor Company Wuxi 214106 China

A coupled supersonic inlet-fan Navier–Stokes simulation method was developed by using COMSOL-CFD code. The flow turning, pressure rise and loss effects across blade rows of the fan and the inlet-fan interactions were taken into account as source terms of the governing equations without a blade geometry by a body force model. In this model, viscous effects in blade passages can also be calculated directly, which include the exchange of momentum between fluids and detailed viscous flow close to walls. NASA Rotor 37 compressor test rig was used to validate the ability of the body force model to estimate the real performance of blade rows. Calculated pressure ratio characteristics and the distribution of the total pressure, total temperature, and swirl angle in the span direction agreed well with experimental and numerical data. It is shown that the body force model is a promising approach for predicting the flow field of the turbomachinery. Then, coupled axisymmetric mixed compression supersonic inlet-fan simulations were conducted at Mach number 2.8 operating conditions. The analysis includes coupled steady-state performance, and effects of the fan on the inlet. The results indicate that the coupled simulation method is capable of simulating behavior of the supersonic inlet-fan system.

关键词： Body force model coupled simulation Rapid numerical method Supersonic inlet-fan Viscous flow

Collaborative optimization of linear vibrating screen screening efficiency and dynamic response stability based on coupled DEM-MBK simulation

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Particuology 2023年第7期78卷 49-61页

作者： Xuhui Xia Lingxiao Gou Zelin Zhang Lei Wang Yuyao Guo Weimin Jing Key Laboratory of Metallurgical Equipment and Control Technology Wuhan University of Science and TechnologyWuhan430081China

The dynamic response stability of the vibrating screen is an important factor affecting the screening effect and the structural performance of the vibrating *** this paper,to improve dynamic response stability and screening efficiency,we optimized the configuration of linear screening process parameters based on the co-optimization method with dual objectives via the virtual ***,a coupled DEM-MBK simulation model was established according to the dynamics of linear screen,and the dy-namic response law of the screen machine under material impact was ***,the quantitative index of dynamic response stability according to the time-domain characteristics of the centroid amplitude was *** trend and significance of three types of screening process pa-rameters,including excitation,damping and structure,on the screening efficiency and dynamic response stability were analyzed through virtual orthogonal ***,a parameter configuration scheme to achieve co-optimization was proposed based on the comprehensive balance *** virtual experiment results show that the screening efficiency and dynamic response stability of the proposed scheme are improved by 3.28%and 49.07%,respectively,compared with the empirical parameter ***,the co-optimization method can maintain high screening efficiency and dynamic response stability at the same time,which is beneficial to improve the service life of the screen surface and screen body.

关键词： Discrete element method Multi-rigid body kinematics coupled simulation Dynamic response stability Linear vibrating screen

simulation study of coupled particle cascade and finite element analysis for beam dump of DALS

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Radiation Detection Technology and Methods 2024年第2期8卷 1254-1263页

作者： Liming Huang Dejun E Kai Tao Changqi Liu Institute of Advanced Science Facilities ShenzhenGuangdongChina Dalian Institute of Chemical Physics Chinese Academy of SciencesDalianLiaoningChina

Purpose Charged particle cascade simulations,in conjunction with finite element thermal and mechanical calculations,are essential for addressing engineering challenges associated with the design of accelerator beam *** study aims to investigate the integration of the FLUKA Monte Carlo program and the COMSOL finite element program as indispensable tools in the development of advanced models for spatial energy deposition distributions,temperature assessments,and stress analysis within the DALS beam *** The paper delves into aspects of model development,data transfer,and practical applications,focusing on the successful coupling of FLUKA Monte Carlo simulations with COMSOL finite element *** of millions of elements were created and utilized to estimate spatial energy deposition distributions,assess temperatures,and analyze stresses within the critical absorber of the DALS beam *** study comprehensively analyzes the process from the impact of high-energy electron beam on the beam dump to the spatial distribution of energy deposition,providing input for subsequent thermal and structural *** The successful coupling of FLUKA and COMSOL enabled the calculation of spatial temperature distributions and structural analyses of the absorber within the DALS beam *** utilization of tens of millions of defined bins ensured seamless data transfer from the particle cascade simulation to finite element analysis,guaranteeing high resolution and accuracy in the *** results provide valuable insights into the thermal and mechanical behavior of the beam dump absorber,a critical safety component in accelerator *** The study demonstrates that the integration of FLUKA Monte Carlo simulations with COMSOL finite element analyses is a dependable and efficient tool for addressing real-world engineering challenges,particularly those related to the design of beam dumps in accelerator systems with charged particle ***

关键词： Particle cascade Finite element coupled simulation FLUKA COMSOL

Flight simulation from takeoff to yawing of eVTOL airplane with coaxial propellers by fluid-rigid body interaction

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Advances in Aerodynamics 2023年第1期5卷 29-43页

作者： Ritsuka Gomi Ayato Takii Masashi Yamakawa Shinichi Asao Seiichi Takeuchi Momoha Nishimura Department of Mechanical Engineering Kyoto Institute of TechnologyKyotoJapan Department of Mechanical Engineering College of Industrial TechnologyHyogoJapan

In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff and landing aircraft(eVTOL).The aircraft model has four pairs of coaxial propellers,and the computational domain is divided into three domains to move the aircraft and eight propeller domains to rotate the *** a result,we clarify the behavior and aerodynamic force of the aircraft when the input values are determined by the automatic *** results in the flow field also show that the downwash spreads in a crisscross pattern on the ground,the wind reaches different ranges on the ground depending on the flight altitude,and that the coaxial propeller causes an asymmetry in the velocity field during ***-quently,we conclude that this method is effective for the flight simulation of an eVTOL.

关键词： Computational fluid dynamics Moving grid coupled simulation Flying car eVTOL

simulation and analysis of the pneumatic recovery for side-cutting loss of combine harvesters with CFD-DEM coupling approach

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International Journal of Agricultural and Biological Engineering 2022年第2期15卷 117-126页

作者： Tao Jiang Min Zhang Zhuohuai Guan Senlin Mu Chongyou Wu Gang Wang Haitong Li Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Synergistic Innovation Center of Jiangsu Modern Agricultural Equipment and Technology Zhenjiang 212013JiangsuChina

A novel pneumatic recovery method was proposed to curb the problem of high losses caused by side-cutting in a rapeseed combine harvester *** influence of recovery method and material status changes on the recovery effect was studied via the CFD-DEM(computational fluid dynamic-discrete element method)coupling *** effect of airflow action on the recovery effect was compared and analyzed,and the composite pneumatic recovery method was *** addition,the influence of material status changes and material feeding rate on the recovery effect was explored,and the critical condition of material blockage in the recovery device was *** such,the relationship model between air velocity and recovery rate was constructed and the air distribution ratio of the flow field in the device under this condition was optimized,had verified the rationality of this pneumatic recovery method was verified by a series of field *** average rapeseed recovery rate of 92.95%was achieved with the application of the recovery device,and the total loss rate of the header reduced by 52.26%,which is of great significance in reducing the total loss rate of the combine harvesters and improving the operation performance of *** research results can provide a reference for the design of the header structure of a rape combine harvester.

关键词： rapeseed combine harvester side-cutting loss coupled simulation pneumatic recovery

Thermo-Hydraulic Characteristics of Non-Isothermal Batch Transportation Pipeline System with Different Inlet Oil Temperature

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Journal of Thermal Science 2023年第3期32卷 965-981页

作者： CHEN Zhimin YUAN Qing JIANG Weixin LI Zongze YU Bo School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China Faculty of Environment and Life Beijing University of TechnologyBeijing 100124China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The batch transportation process of several kinds of crude oil is accomplished by an entire coupled pipeline system,which exhibits complex thermo-hydraulic *** on the coupled characteristics among soil,pipelines and devices(including pumps,heating furnaces and valves),a coupled simulation model of batch transportation for the crude oil pipeline system is established,and a novel coupled simulation algorithm is *** simulation results are in good agreement with the field data of an actual crude oil pipeline *** addition,based on the numerical simulation,thermo-hydraulic characteristics of pipeline system are investigated,and some new thermo-hydraulic characteristics are *** the batch transportation process with constant flowrate,the change trends of temperature at the outlet of each pipeline segment are hysteretic and the change ranges of temperature become small along *** the adjustment of devices influences thermohydraulic characteristics to some *** the batch transportation process with variable flowrate,the complex thermo-hydraulic characteristics are exhibited,which are induced by the comprehensive influence of the changes of oil type,flowrate and absorbed/released *** with the transportation process with constant flowrate,the high-viscosity oil exhibits similar minimum temperature and lower maximum pressure in the transportation process with variable flowrate,which means that the higher transportation safety of pipeline system is *** study can provide a scientific reference for making the safer batch transportation scheme of crude oil pipeline system.

关键词： crude oil pipeline system batch transportation coupled simulation variable flowrate thermo-hydraulic characteristics

Multi-sensor information fusion based control for VAV systems using thermal comfort constraints

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Building simulation 2021年第4期14卷 1047-1062页

作者： Xu Zhu Taotao Shi Xinqiao Jin Zhimin Du School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

The conventional control methods of variable air volume (VAV) air conditioning systems usually assume that the indoor air is well mixed, and consider each building zone as one node with homogeneous temperature distribution. The average temperature is subsequently used as the controlled parameter in the VAV cascade control process, which might cause uneven temperature distribution and unsatisfactory thermal comfort. This paper presents a coupled simulation of computational fluid dynamics (CFD) and building energy simulation (BES) for the VAV system in an office building located in Shanghai for the purpose of simulating the building, the VAV control system, and indoor thermal environment simultaneously. An external interface is developed to integrate the CFD and BES models based on quasi-dynamic coupling approach. Based upon the developed co-simulation platform, the novel VAV control method is further proposed by fusing information from multiple sensors. By adding two temperature sensors to constrain the thermal comfort of the occupied zone, the supply air temperature setpoint of the VAV terminal unit can be reset in real time. The novel control method is embedded into the co-simulation platform and compared with the conventional VAV control approach. The results illustrate that the temperature distribution under the proposed method is more uniform. At most times of the typical test day, the air diffusion performance indexes (ADPIs) for the proposed method are above 80%, while the ADPIs for the conventional control method are between 60% and 80%. Due to multi-sensor information fusion, the proposed VAV control approach has better ability to ensure the indoor thermal comfort.

关键词： coupled simulation thermal comfort multi-sensor information fusion VAV control

Dynamic Analysis of a 10 MW Floating Offshore Wind Turbine Considering the Tower and Platform Flexibility

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Journal of Ocean University of China 2024年第2期23卷 358-370页

作者： GAO Shan ZHANG Lixian SHI Wei WANG Wenhua WANG Bin LI Xin Key Laboratory of Far-Shore Wind Power Technology of Zhejiang Province Hangzhou 311122China State Key Laboratory of Coastal and Offshore Engineering Deepwater Engineering Research CenterDalian University of TechnologyDalian 116024China Powerchina Huadong Engineering Corporation Limited Hangzhou 311122China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

Recently,semisubmersible floating offshore wind turbine technologies have received considerable *** the coupled simulation of semisubmersible floating offshore wind energy,the platform is usually considered a rigid model,which could affect the calculation accuracy of the dynamic *** dynamic responses of a TripleSpar floating offshore wind turbine equipped with a 10 MW offshore wind turbine are discussed *** simulation of a floating offshore wind turbine under regular waves,white noise waves,and combined wind-wave conditions is *** effects of the tower and platform flexibility on the motion and force responses of the TripleSpar semisubmersible floating offshore wind turbine are *** results show that the flexibility of the tower and platform can influence the dynamic responses of a TripleSpar semisubmersible floating offshore wind *** the flexibility of the tower and platform,the tower and platform pitch motions markedly increased compared with the fully rigid ***,the force responses,particularly for tower base loads,are considerably influenced by the flexibility of the tower and ***,the flexibility of the tower and platform for the coupled simulation of floating offshore wind turbines must be appropriately examined.

关键词： floating offshore wind turbine TripleSpar semisubmersible platform rigidity and flexibility platform coupled simulation