Physical Sciences Inc. (PSI) has been involved in modeling and simulation activities since its inception in 1973. The early efforts were focused on flow modeling applicable to re-entry vehicles, simulation of lasers interacting with solid, liquids and gases, and calculation of equilibrium and non-equilibrium chemical systems. These studies used computer code models originally developed at PSI or acquired from other sources. These codes can be divided into four broad categories of codes:

• Fluid mechanics and heat transfer
• Thermo-structural response and flight mechanics
• Optics and radiation
• Chemistry and combustion

In addition to these phenomenology models, PSI has also acquired modern CAD/CAM and FEA tools used to design new products and experiments. These are used routinely on many projects.

More recently, PSI has developed complete simulation tools for a variety of technical disciplines. The DEWAT Code is a new computer model that enables the user to evaluate the effects of directed energy weapons (high energy lasers and high power microwaves) on aerospace systems. This modeling and simulation tool will be used to assess damage effects and will be linked to other models that can evaluate probability of effects on component systems. PSI has also developed a unique dynamics solver HVASC that was designed to evaluate the flight of advanced kinetic energy projectiles, but can be used as a general flight dynamics tool. These codes have been delivered to government agencies and are state of the art models.