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Calculation grid and turbulence model for numerical simulating pressure fluctuations in high-speed train tunnel 被引量:3
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作者 JI Peng WANG Tian-tian WU Fan 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第10期2870-2877,共8页
Calculation grid and turbulence model for numerical simulating pressure fluctuations in a high-speed train tunnel are studied through the comparison analysis of numerical simulation and moving model test.Compared the ... Calculation grid and turbulence model for numerical simulating pressure fluctuations in a high-speed train tunnel are studied through the comparison analysis of numerical simulation and moving model test.Compared the waveforms and peak-peak values of pressure fluctuations between numerical simulation and moving model test,the structured grid and the SST k-ωturbulence model are selected for numerical simulating the process of high-speed train passing through the tunnel.The largest value of pressure wave amplitudes of numerical simulation and moving model test meet each other.And the locations of the largest value of the initial compression and expansion wave amplitude of numerical simulation are in agreement with that of moving model test.The calculated pressure at the measurement point fully conforms to the propagation law of compression and expansion waves in the tunnel. 展开更多
关键词 high-speed train calculation grid turbulence model TUNNEL pressure fluctuations
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Model for Anticipating Failures by Omission in Calculation Grids 被引量:1
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作者 Ramadane Adamou Yougouda Marcellin Nkenlifack +1 位作者 Vivient Corneille Kamla Laurent Bitjoka 《Open Journal of Optimization》 2021年第3期71-87,共17页
Computer grids are infrastructures in which heterogeneous and distributed resources offer very high computing or storage performance. If they offer extreme computing performance, they are also subject to the appearanc... Computer grids are infrastructures in which heterogeneous and distributed resources offer very high computing or storage performance. If they offer extreme computing performance, they are also subject to the appearance of many failures related to this type of architecture. While performing tasks, if the response time of a node in the system incomprehensibly exceeds the requirements of the specifications, the node experiences an omission failure. The task running in the failed node will be unavailable until the node resumes normal activity. Waiting not being a possible solution, many fault tolerance methods have been proposed. Despite this large number of fault tolerance methods on offer, computer grids are still prone to many failures by omission. In this work, a numerical study of the failures by omission which occur in the calculation grids during the execution of the tasks was carried out and a model allowing anticipating its failures was proposed with the formalism PDEVS (Parallel Discret EVent system Specification). 展开更多
关键词 calculation grids Fault Tolerance Failures by Omissions PDEVS DEVS MODELING Simulation DEVSJAVA
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