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AIAA Aerospace Sciences Meeting, 2018

作者： Kao, David L. Smith, Katherine L. Liu, Zhanping Division NASA Ames Research Center Moffett FieldCA94035 United States Dept. of Mathematics Old Dominion University NorfolkVA23529 United States Dept. of Modeling Simulation and Visualization Engineering Old Dominion University NorfolkVA23529 United States

ISBN: (数字)9781624105241

ISBN: (纸本)9781624105241

Blade tip vortices generated by a helicopter rotor blade are a major source of rotor noise and airframe vibration. The noise and vibration occur when a vortex passes close to, and interacts with, a rotor blade. Accurate prediction of Blade Vortex Interaction (BVI) remains a challenge for Computational Fluid Dynamics (CFD). Although considerable research has been devoted to BVI noise reduction and experimental techniques for measuring the blade tip vortices in a wind tunnel, there are only a handful of post-processing tools available for extracting vortex core lines from CFD simulation data. In order to obtain the vortex core radius, most of these tools require the user to manually select a vortex core to perform the calculation. Furthermore, none of these tools provide an ability to track the growth of a vortex core, which is a measure of how quickly the vortex diffuses over time. This paper introduces an automated approach for tracking the core growth of a blade tip vortex from CFD simulations of rotorcraft in hover. The proposed method enables effective quantification and visualization of blade tip vortices in helicopter rotor wakes. © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Vortex flow

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Modeling of Incident-Induced Capacity Loss for Hurricane Evacuation simulation

Modeling of Incident-Induced Capacity Loss for Hurricane Eva...

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International Conference on Intelligent Transportation

作者： Yuan Zhu Kaan Ozbay Kun Xie Hong Yang Transportation Institute of Inner Mongolia University Hohhot China New York University C2SMART Center (A Tier USDOT UTC) Brooklyn NY USA Department of Civil & Environmental Engineering Old Dominion University Norfolk VA USA Department of Modeling Simulation & Visualization Engineering Old Dominion University Norfolk VA USA

ISBN: (纸本)9781538670255

Modeling and simulation of hurricane evacuation is an important task in emergency planning and management. One typically ignored factor that affects the development of a reliable evacuation model is the uncertainty caused by the incident-induced capacity loss. Lately, the impact of incidents on evacuation has drawn increasingly attention among researchers and practitioners, but few of them thoroughly investigated it using the real data in the modeling and simulation context. This study aims to investigate the impact of various types of incidents on modeling and simulation of hurricane evacuation. Particularly, the incidents that occurred under actual hurricane conditions are examined and their impact on the capacity loss is modeled. The developed incident frequency and duration models are incorporated into the network assignment model to study traffic conditions under hurricane Sandy in New York. Results show that the consideration of incident-induced capacity loss can greatly change the outcome of the evacuation model. Our findings suggest the need to include a well calibrated and validated traffic incident generation module for modeling and simulating hurricane evacuation.

关键词： Hurricanes Data models Accidents Urban areas Roads Planning

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Numerical simulation of a walking beam slab reheating furnace

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Iron and Steel Technology 2017年第3期14卷 78-88页

作者： Tang, Guangwu Wu, Bin Bai, Dengqi Wang, Yufeng Bodnar, Rick Zhou, Chenn Center for Innovation Through Visualization and Simulation Purdue University Northwest HammondIN United States NIPSCO United States SSAB Americas R and D MuscatineIA United States

Comprehensive numerical modeling and validation were conducted on an industrial walking beam slab reheating furnace. A three-dimensional computational fluid dynamics (CFD) model was developed to simulate the flow characteristics, combustion process and multiscale heat transfer inside the reheating furnace. The operation process was modeled with specific slab walking speed and fuel variations. The model was validated with instrumented slab trials conducted at SSAB Mobile. The CFD model offers detailed descriptions of the complicated combustion and heat transfer processes. The furnace temperature was properly predicted based on actual operation boundary conditions, and the model was validated by the instrumented slab trials. The current model is capable of predicting the temperature distribution inside the entire reheating furnace and also the slab temperature profiles throughout the reheating process. The model provides reasonable predictions and can be used to identify potential production issues and to optimize the furnace operation.

关键词： Combustion

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Interaction+: Interaction enhancement for web-based visualizations 10

Interaction+: Interaction enhancement for web-based visualiz...

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10th IEEE Pacific visualization Symposium, PacificVis 2017

作者： Lu, Min Liang, Jie Zhang, Yu Li, Guozheng Chen, Siming Li, Zongru Yuan, Xiaoru Peking University China School of Engineer and Information Technology University of Technology Sydney Australia Beijing Engineering Research Center of Virtual Simulation and Visualization China

ISBN: (纸本)9781509057382

In this work, we present Interaction+, a tool that enhances the interactive capability of existing web-based visualizations. Different from the toolkits for authoring interactions during the visualization construction, Interaction+ takes existing visualizations as input, analyzes the visual objects, and provides users with a suite of interactions to facilitate the visual exploration, including selection, aggregation, arrangement, comparison, filtering, and annotation. Without accessing the underlying data or process how the visualization is constructed, Interaction+ is application-independent and can be employed in various visualizations on the web. We demonstrate its usage in two scenarios and evaluate its effectiveness with a qualitative user study. © 2017 IEEE.

关键词： visualization

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Visual Analysis for Wildlife Preserve based on Muti-systems

Visual Analysis for Wildlife Preserve based on Muti-systems

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2017 IEEE Conference on Visual Analytics Science and Technology, VAST 2017

作者： Lin, Lijing Lu, Min Li, Guozheng Lai, Chufan Jiang, Ruike Liu, Qiangqiang Yuan, Xiaoru Key Laboratory of Machine Perception Ministry of Education School of EECS Peking University China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University China

ISBN: (纸本)9781538631638

In the Grand Challenge of IEEE VAST Challenge 2017, we explore the systems in each mini-challenge, and combine the discoveries logically to provide a comprehensive story happened in the wildlife preserve. In this report, we present technical details for the systems, in order to discuss how to discover the events, and how to combine them to construct an overall picture considering the additional information, newsletter, in the Grand Challenge. © 2017 IEEE.

关键词： Trajectory Production facilities Chemicals Visual analytics Chemical sensors Sensors

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Investigation of Coherent Jet Penetration into Steel Bath in an Electric Arc Furnace

Investigation of Coherent Jet Penetration into Steel Bath in...

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The 7th International Conference on Modelling and simulation of Metallurgical Processes in Steelmaking

作者： TANG Guangwu CHEN Yuchao SILAEN K.Armin SPENCER Andrew KROTOV Yury ZHOU Q.Chenn Center for Innovation through Visualization and Simulation (CIVS) Purdue University Northwest

The Electric Arc Furnace(EAF) has played an important role in the steel making process. During the furnace refining stage, high speed coherent jets are used to increase the depth of oxygen jet penetration for better stirring in the liquid steel. A coherent jet is defined when the supersonic jet is shrouded by a flame envelope, which leads to a higher potential core length(the length which the axial jet velocity equals to the exit velocity at the nozzle). In this paper, the coherent jet penetration depth into the liquid steel in an EAF was investigated using Computational Fluid Dynamics(CFD). A multiphase flow CFD model was developed to simulate the phase interactions among coherent gas jet, liquid slag and steel. An Eulerian multiphase model was employed and coupled with Volume of Fluid(VOF) model to capture the details of interface behaviors. The coherent jet CFD model was developed separately with detailed consideration of compressible flow properties and combustion effects. The model was validated by comparing the coherent jet axial velocity profile with experimental measurements. The simulation results showed that the coherent jet core length can reach 60 times of supersonic jet port diameter. The coherent jet velocity profile was applied into the multiphase simulation based on a literature proposed mapping method. Based on the developed CFD model, the coherent jet penetration depth into the liquid steel was investigated.

关键词： low cycle fatigue microstructure hardness

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Hurricane Evacuation Modeling Using Behavior Models and Scenario-Driven Agent-based simulations

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Procedia Computer Science 2018年 130卷 836-843页

作者： Yuan Zhu Kun Xie Kaan Ozbay Hong Yang New York University C2SMART Center (A Tier USDOT UTC) 6 Metrotech Center Brooklyn NY 11201 USA Old Dominion University Department of Modeling Simulation & Visualization Engineering 4700 Elkhorn Ave Norfolk VA 23529 USA University of Canterbury Department of Civil and Natural Resources Engineering 20 Kirkwood Ave Christchurch 8041 New Zealand

Transportation modeling and simulation play an important role in the planning and management of emergency evacuation. It is often indispensable for the preparedness and timely response to extreme events occurring in highly populated areas. Reliable and robust agent-based evacuation models are of great importance to support evacuation decision making. Nevertheless, these models rely on numerous hypothetical causal relationships between the evacuation behavior and a variety of factors including socio-economic characteristics and storm intensity. Understanding the impacts of these factors on evacuation behaviors (e.g., destination and route choices) is crucial in preparing optimal evacuation plans. This paper aims to contribute to the literature by integrating well-calibrated behavior models with an agent-based evacuation simulation model in the context of hurricane evacuation. Specifically, discrete choice models were developed to estimate the evacuation behaviors based on large-scale survey data in Northern New Jersey. Monte-Carlo Markov Chain (MCMC) sampling method was used to estimate evacuation propensity and destination choices for the whole population. Finally, evacuation of over a million residents in the study area was simulated using agent-based simulation built in MATSim. The agent-based modeling framework proposed in this paper provides an integrated methodology for evacuation simulation with specific consideration of agents’ behaviors. The simulation results need to be further validated and verified using real-world evacuation data.

关键词： Hurricane evacuation demand modeling agent-based simulation MATSim

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Evaluation of Burden Descent Model for Burden Distribution in Blast Furnace

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Journal of Iron and Steel Research International 2016年第8期23卷 765-771页

作者： Ping ZHOU Peng-yu SHI Yan-po SONG Kai-le TANG Dong FU Chenn Q.ZHOU School of Energy Science and Engineering Central South University Center for Innovation through Visualization and Simulation Purdue University Calumet

Mathematical models for burden descending process have been applied to obtain whole burden structures in blast furnace,whereas the accuracy of those burden descent models has not been sufficiently *** evaluation method based on timeline burden profiles was established to quantitatively evaluate the error between experimental and modeled burden *** existing burden descent models were utilized to describe the burden structure of a 1/20 scaled warm blast *** modeling conditions including initial burden profile,descending volumes in each time interval,and normalized descending velocity distribution were determined via special image processing *** burden structures were evaluated combined with the published experimental *** is found that all the models caught the main profile of the burden ***,the improved nonuniform descent model（Model IV）shows the highest level of precision especially when burden descends with unstable velocity distribution ***,the traditional nonuniform descent model（Model III）may also be desirable to model the burden descending process when the burden descending velocity presents a linear ***,the uniform descent model（Model I）might be the first option for roughly predicting burden structure.

关键词： burden descending descent normalized utilized scaled sufficiently modeled desirable quantitatively

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Evaluation of flow behavior in copper electro-refining cell with different inlet arrangements

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Transactions of Nonferrous Metals Society of China 2017年第10期27卷 2282-2290页

作者： Ping ZHOU Hai-bo MA Zi-wei XIE Hong-jie YAN Chenn Q. ZHOU School of Energy Science and Engineering Central South University Changsha 410083 China Center for Innovation through Visualization and Simulation Purdue University Northwest 2200 169th Street Hammond IN 46323 USA

The arrangement of electrolyte inlet in the copper electro-refining(ER)cell has a great influence on the local flow field,which affects the distribution of electrical current density in *** order to understand the complicated phenomena ofelectrolyte flow behavior in vertical counter electrodes in full-scale copper ER cell,the three-dimensional computational fluiddynamics(CFD)models with four different arrangements of electrolyte inlets,i.e.,single inlet(SI),central bottom inlets(CBI),topside interlaced inlets(TII),and bottom side interlaced inlets(BII),were established to simulate the flow *** resultshave revealed that the parallel injection devices help to improve the electrolyte velocity between electrodes,and while the relativerange of electrolyte velocity in CBI exceeds that of TII and BII,which is more than4times,indicating its severer unequal ***,the average velocity of electrolyte in BII is4times larger than that of SI due to its higher ***,one of the efficient ways to supply fresh copper solution rapidly and uniformly into the inter-electrode space is toadapt the arrangement of *** utilizing such an arrangement,the electro-refining under high electrical current density is possible,and the productivity can be increased in sequence.

关键词： copper electro-refining electrolyte inlet arrangement flow uniformity computational fluid dynamics

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Investigation of the effects of bubble initial diameter and gas flow rate on the performance of a steel ladle with bottom plug

Investigation of the effects of bubble initial diameter and ...

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AISTech 2017 Iron and Steel Technology Conference

作者： Liang, Mingyi Shao, Huinan Wang, Yifan Tang, Guangwu Silaen, Armin K. Voss, Anna Oltmann, Helmut Pitts, April Pretorius, Eugene Zhou, Chenn Q. Center for Innovation through Visualization and Simulation Purdue University Northwest 2200 169th Street HammondIN46323 United States Nucor Steel 3401 Process Dr NW DecaturAL35601 United States

ISBN: (纸本)9781935117643

Stirring of liquid metal with inert gas through stir plugs in the bottom of the ladle is widely implemented at ladle treatment stations. To ensure the high-quality steel is produced, a range of stirring conditions from hard stirring for mixing and sulfur removal, to gentle stirring for inclusion removal is required. In this paper, an iso-thermal and unsteady three-dimensional computational fluid dynamics (CFD) technique is used to study the bubble movement and flow pattern inside the ladle and investigate optimal mixing conditions. Multiphase flow characteristics are simulated using the VOF-Lagrangian method, where VOF method is used to track the liquid steel and liquid slag and Lagrangian method is used to track the argon bubbles. The effects of bubble initial diameter and gas flow rates on the flow characteristics have also been investigated. When comparing the slag eye size obtained in real plant conditions with CFD simulation, good agreement has been observed. © 2017 by AIST.

关键词： Ladles

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