Multi-Domain Model for Rotorcraft Chaff Dispensing and Dispersal

A combined Eulerian/Lagrangian approach for modeling transient behavior of chaff countermeasures released from tactical rotorcraft is to be developed, that promises to track chaff properties from initial cartridge dispensing and bloom through entrainment within the rotorcraft flowfield to final settling to the ground.Development of the software leverages extensive prior simulation and experimental work conducted at CDI on droplet and particle modeling, fuel jettisoning, agricultural airborne spraying applications, icing accretion, brownout cloud simulation, and store separation clearance determination.The software will be designed for supporting applications that include chaff dispenser mounting design, real-time piloted simulation training and tactics development, and radar cross-section (RCS) determination and engagement simulations.The code will be integrated with CDIs real-time free wake analysis to support the development of accurate real-time RCS calculations, and demonstrate the potential for analysis of tactics and doctrine for chaff dispensing in both steady and maneuvering rotorcraft flight conditions.