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Topological rearrangements and flow simulation of dry ordered foams 干有序泡沫的拓扑重排及流动模拟
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2014-10-01 DOI: 10.1142/S1793962314410074
J. Ortiz, H. Belich, M. Orlando, R. E. Lagos
Flow through a narrow bent channel may induce topological rearrangements in a two-dimensional monodispersed dry liquid foam. We use the Cellular Potts Model to simulate a foam under a variable driving force in order to investigate the strain-rate response from these rearrangements. We observe a set of foams' behaviors ranging from elastic, viscoelastic to fluid regime. Bubble's topological rearrangements are localized and their cumulative rearrangements change linearly with time, thus nonavalanches critical behavior is found. The strain-rate affects the rate of topological rearrangements, its dependence on the drag force is nonlinear, obeying a Herschel–Bulkley-like relationship below the foam's flow point.
在二维单分散干液泡沫中,通过狭窄弯曲通道的流动可引起拓扑重排。为了研究这些重排的应变率响应,我们使用细胞波模型模拟了一个可变驱动力下的泡沫。我们观察了泡沫从弹性、粘弹性到流体状态的一系列行为。气泡的拓扑重排是局部的,其累积重排随时间线性变化,从而发现了非雪崩临界行为。应变速率影响拓扑重排速率,其对阻力的依赖是非线性的,在泡沫的流点以下服从herschel - bulkley关系。
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引用次数: 1
Two-dimensional decaying turbulence in confined geometries 受限几何中的二维衰减湍流
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2014-10-01 DOI: 10.1142/S1793962314410086
G. Tóth, G. Házi
Several interesting phenomena have been observed simulating two-dimensional decaying turbulence in bounded domains. In this paper, an overview is given about our observations obtained by simulating freely decaying turbulence in different regular polygon shaped containers with no-slip walls. For these simulations the lattice Boltzmann method has been used as a numerical approach. The initial Reynolds number based on the container dimension was in the order of 10,000. The initial condition was the same in each simulation, therefore, we were able to compare the effect of geometrical constraints on the evolution of relevant physical quantities such as the kinetic energy and the enstrophy.
一些有趣的现象已经观察到模拟二维衰减湍流在有界域。本文综述了我们在不同正多边形无滑移容器内模拟自由衰减湍流的观察结果。对于这些模拟,晶格玻尔兹曼方法被用作数值方法。基于容器尺寸的初始雷诺数约为10,000。每次模拟的初始条件都是相同的,因此,我们能够比较几何约束对相关物理量(如动能和熵)演化的影响。
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引用次数: 2
AN EFFECTIVE WAY TO CONTROL CONGESTION FOR RTI WITH HYBRID ARCHITECTURE 基于混合架构的rti拥塞控制的一种有效方法
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2014-03-01 DOI: 10.1142/S1793962313400072
Xiao Bin, Sun Hongbo, Xiao Tian-yuan
Congestions brought by data explosion may suffer system performance or even cause fatal errors in large-scale simulation systems. This paper analyzes the reasons of generating congestion with queuing theory, and proposes a novel congestion control approach for RTI with hybrid architecture, including framework, sampling policy, queue length predicting, and congestion control algorithm. The framework promotes the usage of federate resources, and improves the performance of HLA simulation systems by dynamically distributing loads on RTIG and LRCs (Local RTI Components). At last, experimental results say that the proposed approach is a flexible, simple and efficient way to control congestion in RTI with hybrid architecture.
在大规模仿真系统中,数据爆炸带来的拥塞可能会影响系统性能,甚至造成致命错误。本文利用排队理论分析了拥塞产生的原因,提出了一种新的基于混合架构的RTI拥塞控制方法,包括框架、采样策略、队列长度预测和拥塞控制算法。该框架通过在RTIG和lrc (Local RTI Components)上动态分配负载,促进了联邦资源的利用,提高了HLA仿真系统的性能。实验结果表明,该方法是一种灵活、简单、有效的混合架构RTI拥塞控制方法。
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引用次数: 0
Extended knowledge attributed Petri Nets 扩展知识属性Petri网
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2014-02-25 DOI: 10.1142/S1793962313500281
Attila Fűr
Choosing the best way for describing physical reality has always been standing in focus of research. Several methodologies have been developed based on classical mathematics, or statistics and also new disciplines — such as soft-computing techniques — appeared. Petri Nets as one of the most naturalistic modeling methodologies are well suited to describe complex process in general. However in some fields of modeling the describing power of basic Petri Nets proved not to be robust enough, therefore several extensions were made to the original concept. Colored tokens (Colored Petri Nets), stochastic delayed streaming of mobile entities (Stochastic Petri Nets), object oriented architecture (Object Oriented Petri Nets), numerical (Numerical Petri Nets) and linguistic attributes (Fuzzy Petri Nets) broaden the range of capabilities. In some fields of problem solving, usage of static and mobile knowledge bases is needed: e.g., flexible manufacturing systems, or intelligent traffic simulation. These problems to be investigated involved new conceptual developments of Petri Nets and led to the introduction of Knowledge Attributed Petri Nets. At the same time distributed control in simulation appeared, intelligent agents supported the connection of mobile knowledge bases and static inference engines in an effective way. The mentioned extensions brought general support in model synthesis, but some unsolved questions remained related to the implementation of intelligent mobile entities. This paper highlights a new level of AI controlled simulation introducing the Extended Knowledge Attributed Petri Nets that offer the capability of easy implementation of mobile inference engines and knowledge base, providing general mobile AI in Petri Nets.
选择描述物理现实的最佳方式一直是研究的焦点。在经典数学或统计学的基础上开发了几种方法,同时也出现了新的学科,如软计算技术。Petri网作为最自然的建模方法之一,非常适合于描述复杂过程。然而,在一些建模领域,基本Petri网的描述能力被证明不够强大,因此对原始概念进行了一些扩展。彩色标记(彩色Petri网),移动实体的随机延迟流(随机Petri网),面向对象的体系结构(面向对象的Petri网),数值(数值Petri网)和语言属性(模糊Petri网)扩大了功能的范围。在解决问题的某些领域,需要使用静态和移动知识库:例如,柔性制造系统或智能交通模拟。这些有待研究的问题涉及到Petri网的新概念发展,并导致了知识属性Petri网的引入。同时仿真中的分布式控制出现,智能代理有效地支持移动知识库与静态推理引擎的连接。上述扩展为模型综合提供了一般支持,但在智能移动实体的实现方面仍存在一些未解决的问题。本文重点介绍了人工智能控制仿真的一个新水平,引入了扩展知识属性Petri网,它提供了易于实现移动推理引擎和知识库的能力,在Petri网中提供了通用的移动人工智能。
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引用次数: 0
A COMPONENT-BASED MODELING AND SIMULATION SUPPORTING ENVIRONMENT 基于组件的建模和仿真支持环境
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2013-09-12 DOI: 10.1142/S1793962313420063
Teng Da, Song Xiao
Simulation modelers, engineers and managers are faced with new challenges at large-scale complex simulation application development. To reduce the difficulty of developing such simulation applications, the simulation environment is required to be extensible, reusable and composable. In order to promote the reusability from coarse-grained federate to fine-grained components, this paper proposes a modeling and simulation environment which consists of component-based architecture, modeling methods, and simulation services to support and simplify the process of complex simulation application construction. Moreover, a standard process and simulation tools are developed to ensure the rapid and effective development of simulation applications.
在大规模复杂仿真应用开发中,仿真建模者、工程师和管理者面临着新的挑战。为了降低开发此类仿真应用程序的难度,要求仿真环境具有可扩展性、可重用性和可组合性。为了促进从粗粒度联邦到细粒度组件的可重用性,本文提出了一种由基于组件的体系结构、建模方法和仿真服务组成的建模仿真环境,以支持和简化复杂仿真应用的构建过程。此外,还制定了标准流程和仿真工具,以确保仿真应用的快速有效开发。
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引用次数: 1
REAL TIME RECONSTRUCTION OF FLUID IN VIDEO 视频中流体的实时重建
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2013-09-12 DOI: 10.1142/S1793962313420014
Hongyan Quan, M. Yu, Xiao Song, Yan Gao
This paper puts forward a new method of realtime reconstruction of fluid in natural scene. It takes the measure of combination of image analysis and LBM (Lattice Boltzmann Methods). First, employs LK (Lucas–Kanade) method to calculate the dense optical flow, and then takes LBM to obtain the joint force of central particles for the initial result. After backfilling the velocity vectors field, it adopts the K-means cluster to obtain several classes, in each class, it takes advantage of the Rayleigh distribution to fit the height field of fluid. Finally, the reconstruction result of fluid is obtained. In addition, it demonstrates the results of the height field of fluid in the experiment. Further experiments shows that it is a valid method of fluid reconstruction with real time and can be used in the study of natural landscape fluid with efficiency and feasibility.
提出了一种实时重建自然场景中流体的新方法。该方法采用图像分析与晶格玻尔兹曼方法相结合的方法。首先采用LK (Lucas-Kanade)方法计算密集光流,然后采用LBM方法得到中心粒子的合力作为初始结果。对速度矢量场进行回填后,采用K-means聚类得到若干类,在每一类中利用瑞利分布拟合流体高度场。最后,得到流体的重构结果。并对实验中流体高度场的计算结果进行了验证。进一步的实验表明,该方法是一种有效的流体实时重构方法,可用于自然景观流体的研究,具有较高的效率和可行性。
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引用次数: 2
VOLUME SEGMENTATION BY POST-PROCESSING DATA FROM SIMULATION OF SOLIDIFICATION IN THE METAL CASTING PROCESS 金属铸造过程中凝固模拟数据的后处理分割
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2013-08-13 DOI: 10.1142/S1793962313410055
Elizabeth Jacob, M. Manoj, R. Sasikumar
In the process of interpreting simulation results, new post-processing techniques are developed. This work presents a post-processing method that analyzes the solidification pattern formed by simulation of the solidification process of molten metal in a mold to produce shaped castings. Simulations generally involve numerical solutions of differential equations which are discretized by dividing the three-dimensional computational domain into small finite volume elements using a 3D grid. The locations of the grid points and values of the solidification time at these locations are used to divide the spatial data into 3D sections such that starting from a hotspot location within the section that has high solidification time, there is a gradient outwards with lower values of solidification time. Each section is assumed to be fed by one or more feeders that must freeze only after the section has solidified completely. The volume of a feeder can be determined from the volume of the section it is supposed to feed. The volume and surface area of sections are determined approximately to calculate feeder size and dimensions. The post-processing algorithm is a simulation-based quantitative approach to feeder design which in conventional foundry practice has been more of an art than science. It is also general enough for use in other 3D segmentation applications.
在对模拟结果进行解释的过程中,开发了新的后处理技术。本文提出了一种后处理方法,通过模拟熔融金属在模具中的凝固过程来分析成型铸件的凝固模式。模拟通常涉及微分方程的数值解,这些方程是通过使用三维网格将三维计算域划分为小的有限体积单元而离散的。利用网格点的位置和这些位置的凝固时间值将空间数据划分为三维区域,从凝固时间高的区域内的热点位置开始,向外有一个梯度,凝固时间值较低。假定每一段由一个或多个进料器进料,只有在该段完全凝固后,这些进料器才必须冻结。喂料器的体积可以根据它所要喂料的截面的体积来确定。通过近似确定截面的体积和表面积来计算给料机尺寸和尺寸。后处理算法是一种基于仿真的定量喂料机设计方法,在传统的铸造实践中,它更多的是一门艺术而不是科学。它也足以用于其他3D分割应用程序。
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引用次数: 1
VISUALIZATION OF TURBULENT REACTIVE JET BY USING DIRECT NUMERICAL SIMULATION 直接数值模拟湍流反应射流的可视化
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2013-08-13 DOI: 10.1142/S1793962313410018
Tomoaki Watanabe, Y. Sakai, K. Nagata, O. Terashima, H. Suzuki, T. Hayase, Yasumasa Ito
Direct numerical simulation (DNS) of turbulent planar jet with a second-order chemical reaction (A + B → R) is performed to investigate the processes of mixing and chemical reactions in spatially developing turbulent free shear flows. Reactant A is premixed into the jet flow, and reactant B is premixed into the ambient flow. DNS is performed at three different Damkohler numbers (Da = 0.1,1, and 10). Damkohler number is a ratio of a time scale of a flow to that of chemical reactions, and in this study, the large Da means a fast chemical reaction, and the small Da means a slow chemical reaction. The visualization of velocity field shows that the jet flow is developed by entraining the ambient fluid. The visualization of concentration of reactant A shows that concentration of reactant A for Da = 1 and 10 becomes very small in the downstream region because the chemical reaction consumes the reactants and reactant A is diffused with the jet development. By comparison of the profiles of chemical reaction rate and concentration of product R, it is found that product R for Da = 10 is produced by the chemical reaction at the interface between the jet and the ambient fluids and is diffused into the jet flow, whereas product R for Da = 0.1 is produced in the jet flow after reactants A and B are well mixed.
采用直接数值模拟(DNS)方法研究了空间发展的自由剪切湍流流场的混合和化学反应过程,并对具有二阶化学反应(a + B→R)的平面湍流射流进行了数值模拟。反应物A预混到射流中,反应物B预混到环境流中。DNS以三个不同的Damkohler数(Da = 0.1、1和10)执行。Damkohler数是流动的时间尺度与化学反应的时间尺度之比,在本研究中,大Da表示快的化学反应,小Da表示慢的化学反应。速度场的可视化表明,射流是通过夹带周围流体形成的。反应物A浓度的可视化显示,Da = 1和10时,反应物A的浓度在下游区域变得非常小,这是由于化学反应消耗反应物,反应物A随着射流发展而扩散。通过对比生成物R的化学反应速率和浓度曲线可以发现,Da = 10时的生成物R是在射流与周围流体的界面处发生化学反应并扩散到射流中,而Da = 0.1时的生成物R是在反应物A和反应物B充分混合后在射流中产生的。
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引用次数: 14
DESIGN AND IMPLEMENTATION OF REAL-TIME PHYSICS SIMULATION ENGINE FOR e-ENTERTAINMENT 电子娱乐实时物理模拟引擎的设计与实现
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2013-08-13 DOI: 10.1142/S1793962313400023
M. Bae, Young J. Kim
We present our recent research results regarding the designing and implementation of real-time physics simulation engines, which aim at developing physics-inspired e-entertainment such as computer games, mobile applications, interactive TV and other smart media in Korea. Our real-time physics engine consists of three functional components: rigid body dynamics simulation, deformable body simulation, and data-driven physics simulation. The core simulation techniques to realize these simulation components include real-time collision detection and response, large-scale model simulation, and character model control. In this paper, we highlight these features and demonstrate their performances. We also showcase some of the gaming applications that we have integrated our physics engine into.
我们介绍了我们最近关于实时物理模拟引擎的设计和实现的研究成果,旨在开发韩国的物理启发的电子娱乐,如电脑游戏,移动应用程序,互动电视和其他智能媒体。我们的实时物理引擎由三个功能组件组成:刚体动力学仿真、可变形体仿真和数据驱动物理仿真。实现这些仿真组件的核心仿真技术包括实时碰撞检测与响应、大规模模型仿真和人物模型控制。在本文中,我们突出了这些特征并展示了它们的性能。我们还展示了一些整合了物理引擎的游戏应用。
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引用次数: 0
A VASUALIZATION FOR THE DYNAMIC BEHAVIORS OF THE MIXTURE OF WATER MASS FOR NORTHWESTERN PACIFIC NEAR JAPAN 日本附近西北太平洋混合水团动力特性的数值模拟
IF 1.2 Q3 COMPUTER SCIENCE, THEORY & METHODS Pub Date : 2013-08-13 DOI: 10.1142/S179396231341002X
Kun Zhao, S. Nakada, Naohisa Sakamoto, K. Koyamada, C. Bajaj, Y. Ishikawa, T. Awaji, T. In, S. Saitoh
Recent studies are focusing on the distribution of water mass because the mixture region of water mass is highly related to the rich fishing grounds [Yasuda I., Watanabe Y., Fish. Oceanogr.3(3):172–181, 1994]. Due to the large data size and time-varying property, efficient exploration and visualization of the ocean data is always extremely challenging. To extract the dynamic behaviors of the water mass and its mixture from a large-scale simulated ocean dataset, we developed an efficient visualization system by applying our volume compression method and our volume rendering method. This system allows us to investigate the time-varying distributions of ocean physical properties, additionally from the user's perspective and requirements. In the experiments, we show the generality and expressiveness by applying our system for single- and multi-property visualizations to find some significant ocean water mass. Consequently, we could obtain a clear visualization result to show the dynamic behaviors of the mixture of water mass for simulation data regarding a location in the northwestern Pacific near Japan.
最近的研究集中在水团的分布上,因为水团的混合区域与丰富的渔场高度相关[Yasuda I., Watanabe Y., Fish.]。Oceanogr.3(3): 172 - 181, 1994)。由于数据量大、时变特性,海洋数据的高效勘探和可视化一直是一个极具挑战性的问题。为了从大型模拟海洋数据集中提取水体及其混合物的动态行为,我们采用体积压缩方法和体积渲染方法开发了一个高效的可视化系统。该系统使我们能够从用户的角度和要求研究海洋物理性质的时变分布。在实验中,我们通过应用我们的系统进行单属性和多属性的可视化来发现一些重要的海水质量,从而显示了系统的通用性和表现力。因此,我们可以获得一个清晰的可视化结果,以显示在西北太平洋附近的一个位置的模拟数据的混合水团的动态行为。
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引用次数: 3
期刊
International Journal of Modeling Simulation and Scientific Computing
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