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Multiple-Body Collision Algorithms for Computational Simulation of High-Speed Air-Delivered Systems

Published online by Cambridge University Press:  22 January 2015

Robert E. Harris ,
Peter A. Liever ,
Edward A. Luke  and
Jonathan G. Dudley
Robert E. Harris*
Affiliation:
Aerospace & Defense Division, CFD Research Corporation, Huntsville, AL 35806, USA
Peter A. Liever
Affiliation:
Aerospace & Defense Division, CFD Research Corporation, Huntsville, AL 35806, USA
Edward A. Luke
Affiliation:
Computer Science Department, Mississippi State University, Mississippi State, MS 39762, USA
Jonathan G. Dudley
Affiliation:
Air Force Research Laboratory, Eglin AFB, FL 32542-6810, USA
*
*Email addresses: [email protected] (R. E. Harris), [email protected] (P. A. Liever), [email protected] (E. A. Luke), [email protected] (J. G. Dudley)
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Abstract

Currently, there exists a lack of confidence in the computational simulation of multiple body high-speed air delivered systems. Of particular interest is the ability to accurately predict the dispersion pattern of these systems under various deployment configurations. Classical engineering-level methods may not be able to predict these patterns with adequate confidence due primarily to accuracy errors attributable to reduced order modeling. In the current work, a new collision modeling capability has been developed to enable multiple-body proximate-flight simulation in the Loci/CHEM framework. This approach maintains high-fidelity aerodynamics and incorporates six degrees of freedom modeling with collision response, and is well-suited for simulation of a large number of projectiles. The proposed simulation system is intended to capture the strong interaction phase early in the projectile deployment, with subsequent transfer of projectile positions and flight states to the more economical engineering-level methods. Collisions between rigid bodies are modeled using an impulse-based approach with either an iterative propagation method or a simultaneous method. The latter is shown to be more accurate and robust for cases involving multiple simultaneous collisions as it eliminates the need to sort and resolve the collisions sequentially. The implementation of both the collision detection methodology and impact mechanics are described in detail with validation studies to demonstrate the efficiency and accuracy of the developed technologies. The studies chronologically detail the findings for simulating simple impacts and collisions between multiple bodies with aerodynamic interference effects.

Keywords

76SubmunitionprojectileballisticCFD6-DoFsolid body collisioncontact forcehypersonicaerodynamicinterference effects
Type
Research Article
Information
Communications in Computational Physics , Volume 17 , Issue 2 , February 2015 , pp. 564 - 593
Copyright
Copyright © Global Science Press Limited 2015 

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