By Daniel E. Zalewski

Exact modeling of nuclear cloud upward push is necessary in threat prediction following a nuclear detonation. This thesis recommends advancements to the version presently utilized by DOD. It considers a single-term as opposed to a three-term entrainment equation, the price of the entrainment and eddy viscous drag parameters, in addition to the influence of wind shear within the cloud upward thrust following a nuclear detonation. It examines departures from the 1979 model of the dep. of safeguard Land Fallout Interpretive Code (DELFIC) with the present code utilized in the threat Prediction and evaluation power (HPAC) code model 3.2. the advice for a single-term entrainment equation, with consistent worth parameters, with out wind shear corrections, and with no cloud oscillations relies on either a statistical research utilizing sixty seven U.S. nuclear atmospheric try pictures and the actual illustration of the modeling. The statistical research optimized the parameter values of curiosity for 4 situations: the three-term entrainment equation with wind shear and with no wind shear in addition to the single-term entrainment equation with and with out wind shear. The thesis then examines the influence of cloud oscillations as an important departure within the code. variations to person enter atmospheric tables are pointed out as a possible challenge within the calculation of stabilized cloud dimensions in HPAC.