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Algorithmic Improvements to a High-Order Space Marching Method for Sonic Boom Propagation

AMS Seminar Series

Speaker: Jeffrey A. Housman, Computational Aerosciences Branch, NASA Ames Research Center

Presentation

Seminar Slide Deck (PDF-11.4MB)

Abstract

Algorithmic improvements to a high-order space marching method enabling an efficient strategy for sonic boom propagation by coupling near-field Computational Fluid Dynamics (CFD) solutions to an efficient space marching solver are described. The space marching solver is based on a high-order accurate finite-difference discretization of the 3D Euler equations on a specially designed curvilinear grid to enable a single sweep space marching solution. The improvements to the existing space marching method include enhancements to the automatically generated grid, elliptic hole cutting, and generalization of the coupling to both structured and unstructured grid CFD solvers. The coupled approach is shown to improve efficiency and accuracy by reducing the necessary domain size of the CFD grid and generating mid-field solutions from coarse CFD grids equivalent to those obtained using fine grid CFD. This is demonstrated using test cases from the AIAA Sonic Boom Prediction Workshops and four different CFD solvers.

Funded by NASA's Aeronautics Research Mission Directorate Commercial Supersonic Technology project.

Biography

Photo of Jeffrey Housman
Jeffrey Housman received his Bachelor of Science in Mathematics from Sonoma State University in 2000 and his Ph.D. in Applied Mathematics from U.C. Davis in 2007. Housman came to NASA Ames Research Center in 2001 and has been working with Cetin Kiris in the Launch Ascent and Vehicle Aerodynamics (LAVA) group in the Computational Aerosciences Branch of the NASA Advanced Supercomputing Division. In LAVA, his work has been focused on development of the structured overset curvilinear grid solver and far-field aeroacoustic propagation/scattering modules. His research interests include scale resolving simulations, hybrid RANS-LES models, and moving body simulations. Housman has worked on a wide range of NASA mission related applications including launch vehicle takeoff and ascent analysis, aeroacoustic analysis of high-lift devices, noise generation from propulsion systems such as open rotors and jets, design and analysis of the X57, X59, and Boeing TTBW, and more recently he is assisting in stability analysis of several capsule geometries including MSR-EEV, Dragonfly, and DAVINCI.