Transient Acoustic Environment Prediction Tool for Launch Vehicles in Motion During Early Lift-Off

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: 80NSSC18C0208
Agency Tracking Number: 170047
Amount: $749,891.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: T1
Solicitation Number: STTR_17_P2
Solicitation Year: 2017
Award Year: 2018
Award Start Date (Proposal Award Date): 2018-09-27
Award End Date (Contract End Date): 2020-09-26
Small Business Information
701 McMillian Way Northwest, Suite D, Huntsville, AL, 35806-2923
DUNS: 185169620
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Robert Harris
 (256) 726-4800
Business Contact
 Silvia Harvey
Phone: (256) 726-4858
Research Institution
 Mississippi State University
 Lee Boulevard
Mississippi State, MS, 00000-0000
 Federally funded R&D center (FFRDC)

Launch vehicles experience extreme acoustic loads dominated by rocket plume interactions with ground structures during liftoff, which can produce damaging vibro-acoustic loads on the vehicle and payloads if not properly understood and mitigated against. Existing capabilities for modeling turbulent plume physics are too dissipative to accurately resolve the acoustic propagation and detailed vehicle aft-end acoustics relevant to hydrogen pop deflagration and geometric attenuation. Higher fidelity analysis tools are critically needed to design mitigation measures (e.g. water deluge) and ground structures for current and future launch vehicles, and to accurately predict geometric attenuation which may allow significant reductions in SRB nozzle throat plug material density requirements. This project will significantly advance existing capabilities to develop breakthrough technologies to drastically improve transient acoustic loading predictions for launch vehicles in motion during liftoff. Innovative CFD/CAA techniques will be developed with RANS/LES modeling for acoustic generation and discontinuous Galerkin modeling for acoustic propagation and vehicle motion using ideally-suited high-order schemes. This technology enables: greatly reduced dissipation/dispersion; improved modeling of acoustic interactions with complex geometry; and automatic identification of transient acoustic environment including vehicle motion. A proof-of-concept was successfully demonstrated during Phase I for benchmark applications and SLS prototype launch environments. Phase II will deliver production transient CFD/CAA capabilities for launch vehicles in motion during liftoff with 4th-order accuracy for near-lossless acoustic modeling of near-field geometric attenuation and long-distance propagation, which will provide NASA with dramatic increases in the range of resolvable frequencies over current methods.

* Information listed above is at the time of submission. *

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