Modeling mitigation effects of watershield on shock waves
Abstract
The object of this analysis is to investigate mitigation effects
of watershield on air blast waves. To examine the water mitigation
concept, features of the free-field detonation process
are studied from a series of one-dimensional simulations using
a multimaterial Eulerian finite element technique. Five
different shock Hugoniots for water are compared, and the
most accurate data are suggested. To verify the numerical
procedure, results are compared with available experimental
data for UNDEX problem and analytical predictions for air
shocks. For the case of contact watershield, the magnitude
of peak pressure generally decreases and the shock arrival
time increases with increasing thickness of watershield. The
total pressure impulse is reduced significantly at near field.
Non-contact watershield was also examined, and was found
to provide a better design criterion based on the further decay
of peak pressure.