Detached eddy simulations of the MSL parachute at supersonic conditions

Michael Barnhardt, Travis Drayna, Ioannis Nompelis, Graham V. Candler, William Garrard

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

The use of the detached eddy simulation (DES) approach is investigated for the study of rigid supersonic disk-gap-band parachute aerodynamics related to the Mars Science Laboratory mission. The flow around the suspended spacecraft capsule and the resulting unsteady wake are resolved with the CFD method. It is found that the time-varying momentum deficit in the capsule wake interacts with the bow shock on the canopy, producing a highly unsteady flow. The simulations show that the canopy over-pressurizes, expels the excess gas, resulting in collapse of the bow shock and subsequent over pressurization. This alternating over- and under-pressurization is strongly correlated with the bow shock motion and the axial drag on the parachute. We feel that this mechanism is responsible for the sometimes violent dynamics of supersonic disk-gap-band parachutes and the partial skirt collapse that these parachutes experience. The computational and numerical method requirements for performing these unsteady simulations are discussed, as well as grid generation strategies.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 19th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar
Pages263-273
Number of pages11
StatePublished - Dec 20 2007
Event19th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar - Williamsburg, VA, United States
Duration: May 21 2007May 24 2007

Publication series

NameCollection of Technical Papers - 19th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

Other

Other19th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar
CountryUnited States
CityWilliamsburg, VA
Period5/21/075/24/07

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