Simulation of Lightning Current Distributions in a realistic Human Head Model
| Autor: | René Machts, Jens Haueisen, Carsten Leu, Michael Rock, Alexander Hunold |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Human head
Computer science 020302 automobile design & engineering 020206 networking & telecommunications Current density distribution 02 engineering and technology Mechanics Lightning Lightning strike 0203 mechanical engineering 0202 electrical engineering electronic engineering information engineering Arc flash Head (vessel) Current (fluid) Current density |
| Zdroj: | SoftCOM |
| DOI: | 10.23919/softcom.2019.8903746 |
| Popis: | There is evidence that humans can survive a direct lightning strike in the head. The formation of a flashover outside of human body might be a reason for the survival. However, the current density distribution inside the human head and the formation of the flashover are not well investigated. Established computer models neglect the geometric and dielectric properties of interior head structures and the flashover channel. This paper presents first FEM simulations of a direct lightning strike in a realistic eight compartment human head model and compares cases of no flashover and flashover. In case of no flashover the current primarily flowed in the CSF (43 %) and the scalp (42 %). Grey and white matter were less exposed with 4.8 % and 5.4 %. In case of flashover more than 99 % of the current flowed in the flashover channel and only a very small amount in the interior structures of the head. We conclude that four main effects contribute to the survival rate of 70–90 % after lightning strike: (1) the formation of the flashover, (2) the insulating effect of neurocranium (3) the channelling effect of CSF and (4) the low current density exposition in those brain regions which are crucial for controlling vital functions. |
| Databáze: | OpenAIRE |
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