Preliminary experimental and numerical studies of light-core vortex rings
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Nguyen, Thien D.↗
Engineering topics
Moresco, Pablo
Publications and source records attributed to Moresco, Pablo.
On the approximations underpinning fast nuclear cloud models
Fast nuclear cloud models have been used for many decades to predict cloud rise and growth following a nuclear detonation for both emergency response and debris collections mission planning. We present derivations and discussions of the approximations made by such fast nuclear cloud models in common use. In particular, the models we discuss all fundamentally rely on an empirical entrainment parameter to inexpensively model the cloud rise and growth of a buoyant bubble due to entrainment of an ambient air mass on its surface. We show the particular circumstances under which these models are equivalent as well as apply a virtual mass correction throughout them. Aside from some minor differences in representation and the use of the Boussinesq approximation, these models are all very similar and necessitate the specification of an entrainment parameter to accurately determine the cloud rise.
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEF↗
Evaluation of Historic Nuclear Cloud Measurement for Entrainment Parameter Determination
We evaluated the uncertainties associated with the entrainment parameters computed from nuclear cloud measurements taken during historic weapon testing campaigns. This evaluation found that variations in the way cloud heights and diameters were defined during the analysis of film records result in very large uncertainties in the entrainment parameters, severely limiting the utility of these data. For the measurements of atmospheric conditions at the time of the tests, the main sources of error are associated with the differences in the location and timing of the soundings.
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL P↗