The Physics & Engineering Models program provides the models and databases used in
simulations supporting the U.S. stockpile. These models and databases describe
a large variety of physical and engineering processes that occur during the
operation of a nuclear weapon. In addition to supporting the stockpile, a
number of other national security missions use Physics & Engineering Models.
contributions and expertise within this area are outlined below. Our predictive
science-based models integrate theory, computational simulation, and analyses
of experimental data. The resulting models are implemented into Advanced Simulation and Computing (ASC) integrated
engineering and physics codes.
Material Strength and Damage
develops models for the dynamic strength, damage, and failure response of
materials across a wide range of extreme conditions (e.g., pressure,
temperature, and strain rate) unique to weapons. These models rely on building
an intimate understanding of the relationship between evolving microstructure
and its effect on the thermo-mechanical response of materials.
Thermal and Fluid Response
develops models that capture complex thermal and fluid transport in materials. The
application scope covers design through manufacturing with specific emphasis on
response to abnormal fire environments.
Aerodynamics and Vibration
develops models that capture complex aerodynamic and aerothermal flows and
response for gravity and reentry systems. This also includes models that
capture the resultant structural vibration and mechanical response.
Radiation and Electrical Response
develops models that capture material and electrical system effects produced by
exposure to X-ray, gamma, or neutron radiation. The scope includes development
of complex models for integrated circuits and discrete electronic components
such as transistors.