Designing Route Algorithm for WiMAX Centralized Scheduling Mesh Topology to Prevent Interference

The numerical simulation of horizontal axis wind turbines (HAWT) has been analysed using computational fluid dynamics (CFD) with the aim of obtaining reliable but at the same time affordable wind turbine simulations, while significantly reducing required overall resources (time, computational power, user skills), for example in an optimization perspective. Starting from mesh generation, time required to extract preliminary aerodynamic predictions of a wind turbine blade has been shortened by means of some simplifications, i.e.: fully unstructured mesh topology, reduced grid size, incompressible flow assumption, use of wall functions, commercial available CFD package employment. Ansys Fluent software package has been employed to solve Reynolds Averaged Navier Stokes (RANS) equations, and results obtained have been compared against NREL Phase VI campaign data. The whole CFD process (pre-processing, processing, postprocessing) has been analysed and the chosen final settings are the result of a trade-off between numerical accuracy and required resources. Besides the introduced simplifications, numerical predictions of shaft torque, forces and flow distribution are in good agreement with experimental data and as accurate as those calcuted by other more sophisticated works.

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Simulation Of A Local Area Network Protocol Using Spread Spectrum Techniques Built On A Mesh Topology

10.1109/issta.1990.657764 ◽

2005 ◽

Author(s):

T. Mastichiadis

Keyword(s):

Spread Spectrum ◽

Local Area Network ◽

Local Area ◽

Network Protocol ◽

Area Network ◽

Mesh Topology

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Pitfalls for Accurate Steady-State Port Flow Simulations

Volume 11: Transportation Systems ◽

10.1115/imece2012-87534 ◽

2012 ◽

Cited By ~ 1

Author(s):

Xiaofeng Yang ◽

Zhaohui Chen ◽

Tang-Wei Kuo

Keyword(s):

Steady State ◽

Mass Flow Rate ◽

Mass Flow ◽

Flow Rate ◽

Measured Data ◽

Steady State Flow ◽

Bench Tests ◽

Flow Simulations ◽

Mesh Topology ◽

State Flow

Steady-state port flow simulations were carried out with a commercial three dimensional (3D) Computational Fluid Dynamics (CFD) code using Cartesian mesh with cut cells to study the prediction accuracy. The accuracy is assessed by comparing predicted and measured mass-flow rate and swirl and tumble torques at various valve lifts using different boundary condition setup and mesh topology relative to port orientation. The measured data is taken from standard steady-state flow bench tests of a production intake port. The predicted mass-flow rates agree to within 1% with the measured data between the intermediate and high valve lifts. At low valve lifts, slight over prediction in mass-flow rate can be observed. The predicted swirl and tumble torques are within 25% of the flow bench measurements. Several meshing parameters were examined in this study. These include: inlet plenum shape and outlet plenum/extension size, embedded sphere with varying minimum mesh size, finer meshes on port and valve surface, orientation of valve and port centerline relative to the mesh lines. For all model orientations examined, only the mesh topology with the valve axis aligned closely with the mesh lines can capture the mass-flow rate drop for very high valve lifts due to flow separation. This study further demonstrated that it is possible to perform 3D CFD flow analyses to adequately simulate steady-state flow bench tests.

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Study of Wireless Sensor Network Route Based on Improved Ant Colony Algorithm

International Journal of Online Engineering (iJOE) ◽

10.3991/ijoe.v12i10.6196 ◽

2016 ◽

Vol 12 (10) ◽

pp. 86 ◽

Cited By ~ 1

Author(s):

Jingyi Bo ◽

Yubin Wang ◽

Na Xu

Keyword(s):

Wireless Sensor Network ◽

Sensor Network ◽

Ant Colony Algorithm ◽

Low Cost ◽

Ant Colony ◽

Wireless Sensor ◽

Font Size ◽

Energy Equilibrium ◽

Route Algorithm ◽

Selection Of

<span style="font-family: 'Times New Roman',serif; font-size: 10pt; -ms-layout-grid-mode: line; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">Combining the characteristics of wireless sensor network, the ant colony algorithm is applied to a wireless sensor network, and a wireless sensor network route algorithm based on energy equilibrium is proposed in this paper. This algorithm takes the energy factor into the consideration of selection of route based on probability and enhanced calculation of information so as to find out the optimal route from the source node to the target node with low cost and balanced energy, and it prolongs the life cycle of the whole network</span><span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: SimSun; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">.</span>

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Peer-To-Peer Multimedia And Information Sharing In Social Networking Web Sites

10.32920/ryerson.14657298 ◽

2021 ◽

Author(s):

Shahin Talaei

Keyword(s):

Social Networking ◽

Information Sharing ◽

Web Sites ◽

Information Transfer ◽

Overlay Networks ◽

Performance Testing ◽

Peer To Peer ◽

Network Simulator ◽

Mesh Topology ◽

Multimedia Distribution

This thesis examines the performance for multimedia distribution and information sharing of social-networking web sites, with a focus on user networks in Facebook. We used real user network data from Facebook together with a synthetic Facebook network in the performance-testing experiments. We tested performance for multimedia distribution and information sharing using three different types of overlay networks: Facebook; structured peer-to-peer (ring topology); and unstructured peer-to-peer (mesh topology). The experiments used Network Simulator 2 (Ns-2) to simulate the network topologies. The results show that structured Peer-to-Peer has the best performance in terms of information transfer, and Facebook has the best performance in regards to average throughput. This thesis shows the strengths and weaknesses of online social networking while sharing information and multimedia content.

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