Loading on a rigid target from close proximity underwater explosions
article
Abstract. The study describes recent simulation results for underwater explosions in close-proximity to rigid targets. Simulations
are performed using Chinook, an Eulerian computational fluid dynamics (CFD) code. Predicted target loadings are compared
with measurements taken from a series of experiments conducted under an international collaboration between Canada, The
Netherlands, and Sweden. The simulations of the rigid target tests focused on themodelling of gas bubble collapse andwater jetting
behaviour. Both two-dimensional and three-dimensional simulations were performed. It was found that the two-dimensional
analyses produced good bubble periods and reasonable impulse loading compared to experimental data. The time of arrival of
the bubble collapse and water jetting were found to be very mesh dependent and refining the mesh did not always produce better
results. The two-dimensional approach provides a good initial understanding of the problem for a reasonable computational
effort. The three-dimensional simulations were found to produce improved impulse predictions. The numerical gas bubble radii
time histories are also compared to empirical time histories.
are performed using Chinook, an Eulerian computational fluid dynamics (CFD) code. Predicted target loadings are compared
with measurements taken from a series of experiments conducted under an international collaboration between Canada, The
Netherlands, and Sweden. The simulations of the rigid target tests focused on themodelling of gas bubble collapse andwater jetting
behaviour. Both two-dimensional and three-dimensional simulations were performed. It was found that the two-dimensional
analyses produced good bubble periods and reasonable impulse loading compared to experimental data. The time of arrival of
the bubble collapse and water jetting were found to be very mesh dependent and refining the mesh did not always produce better
results. The two-dimensional approach provides a good initial understanding of the problem for a reasonable computational
effort. The three-dimensional simulations were found to produce improved impulse predictions. The numerical gas bubble radii
time histories are also compared to empirical time histories.
TNO Identifier
448681
Source
Shock and Vibration, 18(2011), pp. 1-17.
Pages
1-17
Files
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