Estimating the Life Time Span of Aswan High Dam Reservoir Using Numerical Simulation of Nubia Lake

2017 ◽  
pp. 35-55 ◽  
Author(s):  
Abdelazim M. Negm ◽  
Tarek Abdel-Aziz ◽  
Mohamed Nassar ◽  
Ismail Fathy
Keyword(s):  
Numerical Simulation ◽  
Life Time ◽  
Time Span ◽  
Dam Reservoir ◽  
Aswan High Dam

scholarly journals Performance Analysis of Q-Leach Algorithm in WSN

2020 ◽  
Vol 5 (10) ◽  
pp. 1-4
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Routing Protocol ◽  
Data Transmission ◽  
Short Range ◽  
Sensor Node ◽  
Life Time ◽  
Time Span ◽  
Sensor Nodes ◽  
Wireless Sensor

Sensor nodes are exceedingly energy compelled instrument, since it is battery operated instruments. In wsn network, every node is liable to the data transmission through the wireless mode [1]. Wireless sensor networks (WSN) is made of a huge no. of small nodes with confined functionality. The essential theme of the wireless sensor network is energy helpless and the WSN is collection of sensor. Every sensor terminal is liable to sensing, store and information clan and send it forwards into sink. The communication within the node is done via wireless network [3].Energy efficiency is the main concentration of a desining the better routing protocol. LEACH is a protocol. This is appropriate for short range network, since imagine that whole sensor node is capable of communication with inter alia and efficient to access sink node, which is not always correct for a big network. Hence, coverage is a problem which we attempt to resolve [6]. The main focus within wireless sensor networks is to increase the network life-time span as much as possible, so that resources can be utilizes efficiently and optimally. Various approaches which are based on the clustering are very much optimal in functionality. Life-time of the network is always connected with sensor node’s energy implemented at distant regions for stable and defect bearable observation [10].

Numerical Simulation of Uplift Pressure and Relief Drains at a Dam Reservoir

2017 ◽  
Vol 23 (2) ◽  
pp. 79-96 ◽  
Author(s):  
MEHMET EKMEKCI ◽  
NECATI ERDEM KALAYCIOGLU ◽  
SUKRAN ACIKEL ◽  
OTGONBAYAR NAMKHAI ◽  
SALIH BILGIN AKMAN
Keyword(s):  
Numerical Simulation ◽  
Dam Reservoir ◽  
Uplift Pressure

Fatigue Life Prediction in Rapid Die Casting

2008 ◽  
Author(s):  
Chuan Huat Ng ◽  
Karl-Heinrich Grote ◽  
Ru¨diger Ba¨hr
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Fatigue Life ◽  
Experimental Testing ◽  
Die Casting ◽  
Life Time ◽  
Casting Process ◽  
Simulation Software ◽  
Stress Strain ◽  
Fracture Models

During a die casting process, it is very difficult to achieve efficient and correct casting tooling endurance results by the casting designer and foundry man. However, it is very costly and time consuming to predict the tooling endurance with a trial and error method based on expertise and experience. After an extensive fatigue design study, it was possible to develop specimen design models for the simulation of the time and temperature dependent stress-strain and fracture models to determine the thermal fatigue prediction. In this research, stress-strain approach, heat transfer concept and life time calculation methods were used to predict the casting tool endurance by a computer simulation. The thermal stress and heat transfer behaviour analysis were performed using RWP casting numerical simulation software. It is shown that numerical simulation techniques can simulate stress concentration on the specimen surface to thermal behaviour. Furthermore, the result from the specimen based simulation model associated with fracture indicators permits the construction of a life time design curve independent of time and temperature. The fatigue life predicted by simulation based models and the results from experimental testing on real components are very similar. The simulation results showed that they match the experimental results, including a design safety factor.

Do we still Need an Experiment at All?

2015 ◽  
Vol 732 ◽  
pp. 349-352
Author(s):  
Stanislav Holý ◽  
Zbyněk Hrubý
Keyword(s):  
Numerical Simulation ◽  
Life Time ◽  
Economic Approach ◽  
Lower Mass ◽  
Short Term ◽  
High Quality ◽  
Relationship Of

This contribution is carrying similar title as former published two ones [1,2] , as until today there is some discussion about relationship of numerical simulation a experiment during structure construction,. What is better and what is more trustworthy. Looking at motto we see that any of the separate application cannot fulfill recent requirements for high quality, warranted life time and lower mass of structures together with economic approach (short term of design).

Preliminary Analyses of Single Droplet Evaporation and Movement in the Steam Generator of HTR-PM

2014 ◽  
Author(s):  
Wei Xu ◽  
Lei Shi ◽  
Yanhua Zheng ◽  
Peng Liu ◽  
Liang He
Keyword(s):  
Numerical Simulation ◽  
Steam Generator ◽  
Droplet Diameter ◽  
Life Time ◽  
Droplet Evaporation ◽  
Primary Circuit ◽  
Helium Pressure ◽  
Helium Temperature ◽  
Single Droplet ◽  
Simulation Results

Water ingress accident is one of the most severe accidents which must be analyzed in high temperature gas-cooled reactor pebble-bed modular (HTR-PM). The droplet could enter the primary circuit under the design basis accident of a double-ended guillotine break of a heat transfer tube. This paper simulates the behavior of single droplet evaporation and movement in the steam generator by numerical methods. Based on the structure characteristics of steam generator, the life time of droplet and the distance that the single droplet could move have been analyzed. The important parameters such as the droplet diameter, helium temperature, helium pressure and helium velocity which have an influence on the behavior of droplet evaporation and movement have also been discussed in detail. The preliminary numerical simulation results indicate that the droplet diameter, helium velocity and helium temperature play an important role in the life time of droplet in the accident situation in the primary circuit. Helium pressure has a little effect on droplet evaporation in practical situation. The numerical simulation results demonstrate that only certain droplets with a diameter in certain range could arrive to the bottom of the steam generator pressure vessel (SGPV) and enter into the steam generator annular channel after collision with the bottom of the SGPV. The distance that the single droplet could move in the primary circuit is decided by a various complex factors such as the structure of the primary circuit, the droplet diameter and helium velocity. The preliminary analyses indicate that there is little probability for the single droplet to enter into the reactor core of the HTR-PM.

Modelling of the landslide-induced impulse waves in the Artvin Dam reservoir by empirical approach and 3D numerical simulation

2019 ◽  
Vol 249 ◽  
pp. 112-128 ◽  
Author(s):  
Hakan Ersoy ◽  
Murat Karahan ◽  
Kenan Gelişli ◽  
Aykut Akgün ◽  
Tuğçe Anılan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Empirical Approach ◽  
Dam Reservoir ◽  
3D Numerical Simulation ◽  
Impulse Waves
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