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Numerical Simulation of Radial Ultrasonic Assisted MIG Welding Arc

Journal of Shanghai Jiaotong university(Science) 2024年第2期29卷 330-338页

作者：洪蕾肖皓叶佳马国红 Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Provinc. School of Mechanical EngineeringNanchang UniversityNanchang 330031China Applied Materials Inc.Santa ClaraCA 95054-3299USA

The numerical simulation of arc was carried out for both conventional melt inert gas(MIG)welding and ultrasonic assisted melt inert gas(U-MIG)*** on the model established by fluent,the arc shape,temperature field,and potential distribution were *** study found that the shape of the arc changed when ultrasonic was added radially;the high-temperature area of the arc stretched,and the temperature peak *** as the current inc.eased,the inc.ease in temperature *** addition,under the same conditions,the potential of U-MIG decreased and the pressure on the workpiece *** verify the accuracy of the simulation results,welding experiments under identical conditions were carried out,and a high-speed camera was used to collect dynamic pictures of the *** simulation results were in a favorable agreement with the experimental results,which provided a certain reference value for ultrasonic assisted arc welding.

关键词： numerical simulation welding arc ultrasonic arc welding arc temperature

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COMPUTATIONAL FLUID DYNAMICS SIMULATION OF A FAST BREEDER REACTOR MELTDOWN

COMPUTATIONAL FLUID DYNAMICS SIMULATION OF A FAST BREEDER RE...

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第十三届国际核工程大会

作者： Nader Sanei Kurt Kugeler Wolfgang Timm Dave Schowalter Aachen Technical University Aachen Technical University fluent inc. fluent inc.

＜正＞ To ensure safety and containment during a meltdown of a fast breeder reactor core, a hypothetical case has been considered and simulated via computational fluid dynamics in which the entire core of a helium cooled fast breeder reactor （875 MWt） is melted down. A "core catcher concept" is suggested which should encapsulate the core melt. Its thermal performance can only be determined through a CFD-analysis. The device consists of a

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VERIFICATION OF SMOM AND QMOM POPULATION BALANCE MODELING IN CFD CODE USING ANALYTICAL SOLUTIONS FOR BATCH PARTICULATE PROCESSES

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China Particuology 2006年第5期4卷 243-249页

作者： Terry A.Ring Department of Chemical Engineering University of Utah Salt Lake City UT 84112Fluent Inc. 10 Cavendish Court Lebanon NH 03766

For many processes of industrial significance, due to the strong coupling between particle interactions and fluid dynamics, the population balance must be solved as part of a computational fluid dynamics （CFD） simulation. In this work, a CFD based population balance model is tested using a batch crystallization reactor. In this CFD model, the population balance is solved by the standard method of moments （SMOM） and the quadrature method of moments （QMOM）. The results of these simulations are compared to analytical solutions for the population balance in a batch tank where 1） nucleation, 2） growth, 3） aggregation, and 4） breakage are taking place separately. The results of these comparisons show that the first 6 moments of the population balance are accurately predicted for nucleation, growth, aggregation and breakage at all times.

关键词： population balance computational fluid dynamics particle process modeling

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COMPARISON OF ANALYTICAL SOLUTIONS FOR CMSMPR CRYSTALLIZER WITH QMOM POPULATION BALANCE MODELING IN fluent

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China Particuology 2005年第4期3卷 213-218页

作者： Bin Wan Terry A. Ring Kumar M. Dhanasekharan Jayanta Sanyal Department of Chemical Engineering University of Utah Salt Lake City UT 84112 fluent inc. 10 Cavendish CourtLebanon NH 03766

fluent version 6.2 computational fluid dynamics environment has been enhanced with a population balance capability that operates in conjunction with its multiphase calculations to predict the particle size distribution within the flow field. The population balance is solved by the quadrature method of moments （QMOM）. fluent＇s prediction capabilities are tested by using a 2-dimensional analogy of a constantly stirred tank reactor with a fluid flow compartment that mixes the fluid quickly and efficiently using wall movement and has a feed stream and a product stream. The results of these fluent simulations using QMOM population balance solver are compared to steady state analytical solutions for the population balance in a stirred tank where 1） growth, 2） aggregation, and 3） breakage, take place separately and 4） combined nucleation and growth and 5） combined nucleation, growth and aggregation take place. The results of these comparisons show that the moments of the population balance are accurately predicted for nucleation, growth, aggregation and breakage when the flow field is turbulent. With laminar flow the mixing is not ideal and as a result the steady state well mixed solutions are not accurately simulated.

关键词： population balance particle size distribution computational fluid dynamics crystallization modeling

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DPM dispersion inside a single straight entry using dynamic mesh model

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International Journal of Coal Science & Technology 2017年第3期4卷 234-244页

作者： Yi Zheng Ying Li Magesh Thiruvengadam Hai Lan Jerry C. Tien Missouri University of Science and Technology Rolla MOUSA Clean Air Power inc. Poway CA 92064 USA Monash University Clayton Campus Wellington RoadClayton VIC 3800 Australia

Three-dimensional simulations of diesel particulate matter （DPM） distribution inside a single straight entry for the Load-Haul-Dump loader （LHD）-truck loading and truck hauling operations were conducted by using ANSYS fluent computational fluid dynamics software. The loading operation was performed for a fixed period of 3 min. The dynamic mesh technique in fluent was used to study the impact of truck motion on DPM distribution. The resultant DPM distributions are presented for the cases when the truck were driving upstream and downstream of the loading face. Interesting phenomena were revealed in the study inc.uding the piston effect, layering of DPM in the roof region, and backflow of diesel exhaust against ventilation. The results from the simulation can be used to determine if the areas inside the face area and straight entry exceed the current U.S. regulatory requirement for DPM concentration （〉160 pg/m3）. This research can guide the selection of DPM reduction strategies and improve the working practices for the underground miners.

关键词： CFD · DPM · Dynamic meshing ·Piston effect · Backflow · Buoyancy effect · Layering of DPM

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Suppression of Vortex-Induced Vibration by Fairings on Marine Risers

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Journal of Ocean University of China 2020年第2期19卷 298-306页

作者： KANG Yongtian XIAO Wensheng WANG Quanbin ZHANG Dagang ZHAO Jun Department of Mechanical and Electronic Engineering China University of Petroleum(Huadong)Qingdao 266100China Research Institute of Petroleum Exploration&Development Beijing 100080China Qingdao DMAR Engineering inc. Qingdao 266100China Department of Offshore Oil and Gas Engineering College of Petroleum EngineeringXi’an Shiyou UniversityXi’an 710000China

Vortex-induced vibration is quite common during the operation of offshore risers or umbilical cables,commonly leading to serious damage to risers and reduced service ***-induced vibration of the offshore risers could be effectively suppressed by fairing *** this paper,a newly developed vortex-induced vibration fairing and large eddy simulation model of the fluent software were used for numerical analysis,experimental research and stimulating vortex-induced vibration at 0.1–2 ms^-*** data of the numerical model with fairing was compared and analyzed to study the vortex shedding frequency at different Reynolds numbers and changes in drag and lift *** displacement state of 12 in risers with and without fairing was experimentally tested using a five degree-of-freedom *** vortex-induced vibration effect of the fairing was tested at different *** result shows the drag reduction effect of the fairing is more obvious when the flow velocity is 0.4–1.2 ms^-1 and the maximum drag reduction reaches 55.6%when the flow velocity is 0.6 ms^-***,the drag reduction effect was obvious when the flow velocity was greater than 1.3 ms^-1 and less than *** result indicates that the developed 12 in fairing,with good potential in engineering applications,has good vortex-induced vibration-suppression effects.

关键词： vortex-induced vibration faring devices finite element analysis testing

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Simulating multiphase flow in a two-stage pusher centrifuge using computational fluid dynamics

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Frontiers of Chemical Science and Engineering 2012年第3期6卷 329-338页

作者： Chong PANG Wei TAN Endian SHA Yuanqing TAO Liyan LIU School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Zhejiang Qingji Ind.Co.Ltd.inc. Hangzhou 311401China

The design of two-stage pusher centrifuges have developed rapidly, but a good understanding of the theory behind their practice is a long-standing problem. To better understand centrifugal filter processes, the computational fluid dynamics （CFD） software program fluent has been used to model the three-dimensional geometry and to simulate multiphase flows based on Euler-Euler, moving mesh, dynamic mesh and porous media models. The simulation tangential velocities were a little smaller than those for rigid-body motion. In the stable flow region, the radial velocities were in good agreement with the theoretical data. Additionally, solid concentration distribution were obtained and also showed good agreement with the experimental data. These results show that this simulation method could be an effective tool to optimize the design of the two-stage pusher centrifuge.

关键词： two-stage pusher centrifuge multiphase flow,CFD dynamic mesh porous media

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