scholarly journals Mathematical simulation of heat transfer at coniferous tree ignition by cloud-to-ground lightning discharge

2014 ◽  
Vol 76 ◽  
pp. 01028 ◽  
Author(s):  
Geniy V. Kuznetsov ◽  
Nikolay V. Baranovskiy
Keyword(s):  
Heat Transfer ◽  
Mathematical Simulation ◽  
Lightning Discharge ◽  
Coniferous Tree ◽  
Cloud To Ground Lightning

Mathematical Computing of Coniferous Tree Ignition by the Cloud-to-Ground Lightning Discharge using Joule-Lenz's Law

2017 ◽  
Vol 7 (3) ◽  
pp. 1337
Author(s):  
Nikolay V. Baranovskiy ◽  
Geniy V. Kuznetsov ◽  
Tatiana N. Nemova
Keyword(s):  
Lightning Discharge ◽  
Mathematical Formulation ◽  
Thunderstorm Activity ◽  
Natural Phenomenon ◽  
Coniferous Tree ◽  
Tree Trunk ◽  
Supply Networks ◽  
Cylindrical Coordinate ◽  
Current Passage ◽  
Cloud To Ground Lightning

The natural phenomenon of thunderstorm activity is one of many causes of a forest fire. Thunderstorms cause especially intensive fire danger situations within remote areas and highlands. As a rule, a cloud-to-ground lightning discharge is the fire source. The present study is based on the research results of electrical overloads in supply networks. Physical and mathematical formulation and numerical solution for the problem of a coniferous tree (pine) ignited by a cloud-to-ground lightning discharge are presented. The problem is considered in a cylindrical coordinate system in two-dimensional formulation. The features of current passage and heat transfer taking into account the reactive wood localization are investigated. The Joule-Lenz’s law is used to calculate heat production in a tree trunk. Parametric analysis has been conducted and tree trunk ignition conditions have been determined in a typical range for the influencing parameters of negative and positive discharges.

Mathematical simulation of heat transfer during fluid flow for a fuel element with a polyzonal finned shell

2017 ◽  
Vol 20 (4) ◽  
pp. 58-63
Author(s):  
K. Maksymenko-Sheiko ◽  
◽  
Yu. Litvinova ◽  
T. Sheyko ◽  
M. Khazhmuradov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Fuel Element ◽  
Mathematical Simulation

Mathematical Modelling of Deciduous Tree Ignition by Ground Lightning Discharge Taking into Account Localization of Reactive Wood

2011 ◽  
Vol 6 (4) ◽  
pp. 95-106
Author(s):  
Nikolay Baranovskiy ◽  
Geniy Kuznetsov
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Mathematical Modelling ◽  
Lightning Discharge ◽  
Deciduous Tree ◽  
Tree Trunk ◽  
Mathematical Statement ◽  
Cylindrical System ◽  
Typical Range

Physical and mathematical statement and results of the numerical simulation of a problem about deciduous tree (birch) ignition by ground lightning discharge are presented. The problem is considered in flat statement in cylindrical system of coordinates. Heat transfer features taking into account localization of reactive wood are considered. The parametrical analysis is carried out and conditions of tree trunk ignition in a typical range of parameters of influence of positive discharges are obtained

scholarly journals Mathematical simulation of heat transfer in spacecraft

2017 ◽  
pp. 61-78
Author(s):  
A. G. Vikulov
Keyword(s):  
Heat Transfer ◽  
Mathematical Models ◽  
Mathematical Simulation ◽  
Accuracy Evaluation ◽  
Identification Problems ◽  
Thermal Vacuum ◽  
Ground Testing ◽  
Scientific Approach ◽  
Thermal Calculations ◽  
Vacuum Testing

We implemented a systemic scientific approach to thermal vacuum development of spacecraft, which integrates the problems of thermal calculations, thermal vacuum tests and accuracy evaluation for mathematical models of heat transfer by means of solving identification problems. As a result, the following factors increase the efficiency of spacecraft ground testing: reducing the duration of thermal vacuum tests, making autonomous thermal vacuum testing of components possible, increasing the accuracy of thermal calculations

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