Stock Price: 132.20 -0.23 11/17/2017 4:02 PM ET

Stock Price: 132.20 -0.23 11/17/2017 4:02 PM ET

Aerodynamics/Aerothermodynamics

Orbital ATK provides Aerodynamics ⁄ Aerothermodynamics engineering services primarily to NASA's Langley Research Center. These services include:

Orbital ATK performed work in development of the trajectory modeling software known as Program to Optimize Simulated Trajectories (POST) and its related tools. POST provides the capability to target and optimize point-mass trajectories for a powered or unpowered vehicle operating near an arbitrary rotating, oblate planet. POST was utilized to assist in resolution of a wide variety of atmospheric ascent and reentry problems, as well as orbital transfer problems.

Orbital ATK also maintains and enhances the NASA Aerodynamic Preliminary Analysis System (APAS), a suite of computer codes developed to quickly and efficiently estimate vehicle aerodynamic characteristics in the conceptual and preliminary design phases. APAS generates vehicle aerodynamic databases for conceptual design studies of one- and two-stage to orbit reusable launch vehicles, hypersonic cruise vehicles and Hyper-X project flight-test vehicles. Advanced computational methods are used for higher-fidelity modeling of complex aerodynamic and propulsive flowfields with applications that include: Computation Fluid Dynamics modeling and grid generation, Scramjet Engine flowpath performance analysis, aerodynamic analysis and database development, and stage separation aerodynamic modeling.

Orbital ATK has performed aeroheating analyses of the X-43C Thermal Protection System Design for the Hyper-X Project. These analyses included generation of radiative equilibrium loads for the entire vehicle outer surface, performance of a time-dependent heat-transfer analysis simulating the vehicle through its entire flight trajectory, calculation of the required thickness for the thermal protection system to maintain temperature limits for the vehicle internal environment and the TPS materials, and development of a summary of total weight of all materials required for the TPS.

Orbital ATK also performs analyses and develops simulations of the vehicle dynamics that occur during the separation of two or more launch vehicles. This Bimese Separation Simulation incorporates all important physical phenomena and permits its users to manipulate physical parameters, vehicle configuration, simulation scenarios and separation event, and then to study its effects on the vehicle separation. The simulation incorporates realistic kinematic and dynamic characteristics of multi-vehicle systems and realistic aerodynamic effects.

In addition to the POST family of tools (POST3D, POST6D, POSTII and IPOST) and the APAS suite discussed above, Orbital ATK utilizes GASP, SHIP3D, SCRAM3L, LARCK, SAMcfd, USM3D, OVERFLOW and ADAMS/Solver to perform aerodynamic and aerothermodynamic design, analysis and simulation activities. Verification and validation activities, and wind-tunnel testing and analysis also are supported.