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排序方式: 共有552条查询结果,搜索用时 62 毫秒
1.
G. Ghiasi N.A.K. Doan N. Swaminathan B. Yenerdag Y. Minamoto M. Tanahashi 《International Journal of Hydrogen Energy》2018,43(16):8105-8115
Direct numerical simulation (DNS) data of freely propagating turbulent premixed flame of stoichiometric hydrogen air mixture inside a closed vessel is analysed to study a sub-grid combustion closure based on unstrained flamelet approach. This modeling framework needs closures for the sub-grid scale (SGS) reaction rate and scalar dissipation rate. The results show that the closure models for these two SGS quantities work quite well. The dissipation rate closure involves a scale dependent parameter, , which is related to the flame curvature induced effects. The reactivity of reactant mixture increases with time in isochoric combustion because the mixture temperature and pressure increase with time. This also influences the parameter and thus the dynamic evaluation of this parameter is investigated using the DNS data. 相似文献
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《Digital Communications & Networks》2018,4(4):235-243
DNS-based server redirecting is considered the most popular means of deploying CDNs. However, with the increasing use of remote DNS, DNS-based CDNs face a great challenge in performance degradation. To address this issue, encouraging progress has been made in both industry and research communities. In this article, state-of-art solutions for the remote DNS problem are discussed at first. Next, privacy concerns about DNS-based CDNs, including client location as well as redirection privacy, are identified and a representative solution is summarized. Finally, the solution is compared to those in prior works under different measures, and a discussion on DNS-based CDN applications is provided. A model is also established to deepen the understanding of CDN performance. We believe that this survey will shed light on the application of DNS-based CDNs, and it is expected to provide design guidelines to CDN service providers. 相似文献
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多进程技术是目前大型软件开发中降低复杂性的有效途径.针对BIND10服务器软件的开发提出一种基于安全socket的多进程通讯方法,其中包括一种多进程通信协议(MPCP),通讯接口CI和消息路由进程MRouter的设计.CI使用SSL协议来保障通信的安全性,MRouter使用消息寻址转发机制实现进程之间的点对点和点对多点通信.目前该设计已经在BIND10软件项目中应用并实现,能够完成各个进程模块的实时通讯、支持分布式部署、保证容错性和健壮性、便于扩展功能的实现等. 相似文献
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倪叶青 《计算机光盘软件与应用》2010,(11)
随着三大运营商的整合和国内电信业的发展,多链路的情况的出现,如何实现各链路的最优请求访问一直是困扰大家的一个难题,本文从实际工作经验出发,阐述了利用ISCBIND实现利用DNS对各链路请求实现智能DNS解析,以达到从最优链路访问的应用,并列举了一个获取ISP网段的脚本应用. 相似文献
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DNS欺骗攻击是攻击者常用的手法,它具有隐蔽性强、打击面广、攻击效果明显的特点。分析在以太网中利用对网络数据监听,来截获DNS报文,进而伪造DNS报文进行DNS欺骗的技术,并给出基于WinPcap的实现。 相似文献
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Large-Eddy Simulations (LES) and Direct Numerical Simulation (DNS) are applied to the analysis of a swirl burner operated with a lean methane–air mixture and experimentally studied by Meier et al. [19]. LES is performed for various mesh refinements, to study unsteady and coherent large-scale behavior and to validate the simulation tool from measurements, while DNS enables to gain insight into the flame structure and dynamics. The DNS features a 2.6 billion cells unstructured-mesh and a resolution of less than 100 microns, which is sufficient to capture all the turbulent scales and the major species of the flame brush; the unresolved species are taken into account thanks to a tabulated chemistry approach. In a second part of the paper, the DNS is filtered at several filter widths to estimate the prediction capabilities of modeling based on premixed flamelet and presumed probability density functions. The similarities and differences between spatially-filtered laminar and turbulent flames are discussed and a new sub-grid scale closure for premixed turbulent combustion is proposed, which preserves spectral properties of sub-filter flame length scales. All these simulations are performed with a solver specifically tailored for large-scale computations on massively parallel machines. 相似文献