Modeling and Simulation

Modeling and Simulation projects at AOI include a broad spectrum of technologies and applications with emphasis on aerodynamic and optical phenomena and effects. The requisite tools span the full range from empirical to theoretical.

Computational Fluid Dynamics (CFD)

40km

90km

Computational fluid dynamics (CFD) simulation of an axisymmetric missile plume during ascent. Maximum temperatures (red) occur in the tail region at lower altitudes and in the nose region at higher altitudes.

Vertical Array

Horizontal Array

CFD-based infrared-radiance simulation of an Atlas missile plume at 40 km altitude. The apparent plume width depends on the roll angle of the triple-nozzle linear array.

Infrared Radiation from CFD Plumes

Propellant Concentration

Volumetric Emission

CFD-based infrared-radiance simulation of a liquid-propellant vent into the upper atmosphere. The emission results from chemical reactions between the propellant vapor and atmospheric oxygen.

Radiance Image	Source Spectrum	Apparent Spectrum
Distance, meters	Wavelength, microns

Infrared spectral image of a smokestack effluent plume with ascent, drift, and dispersion due to buoyancy, wind, and entrainment. The spectral structure results from molecular-line emission/absorption in the plume and atmosphere.

Passive/Active Optical Signatures

Cruise Power

Afterburner Power

High-performance fighter aircraft at different power settings in the mid-wave infrared. The images include reflected and emitted radiation from the body and plume.

Angle-Angle

Range-Doppler

Monostatic laser reflectance image of Delta rocket body in angle-angle and range-doppler coordinates. The body axis is rotating toward the transmitter/receiver in the vertical plane.