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Validation of High-Fidelity CFD/CAA Framework for Launch Vehicle Acoustic Environment Simulation against Scale Model Test DataA hybrid Computational Fluid Dynamics and Computational Aero-Acoustics (CFD/CAA) modeling framework has been developed for launch vehicle liftoff acoustic environment predictions. The framework couples the existing highly-scalable NASA production CFD code, Loci/CHEM, with a high-order accurate Discontinuous Galerkin solver developed in the same production framework, Loci/THRUST, to accurately resolve and propagate acoustic physics across the entire launch environment. Time-accurate, Hybrid RANS/LES CFD modeling is applied for predicting the acoustic generation physics at the plume source, and a high-order accurate unstructured mesh Discontinuous Galerkin (DG) method is employed to propagate acoustic waves away from the source across large distances using high-order accurate schemes. The DG solver is capable of solving 2nd, 3rd, and 4th order Euler solutions for non-linear, conservative acoustic field propagation. Initial application testing and validation has been carried out against high resolution acoustic data from the Ares Scale Model Acoustic Test (ASMAT) series to evaluate the capabilities and production readiness of the CFD/CAA system to resolve the observed spectrum of acoustic frequency content. This paper presents results from this validation and outlines efforts to mature and improve the computational simulation framework.
Document ID
20170000602
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Liever, Peter A. (Jacobs Engineering and Science Services and Skills Augmentation Group (ESSSA) Huntsville, AL, United States)
West, Jeffrey S. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Harris, Robert E. (CFD Research Corp. Huntsville, AL, United States)
Date Acquired
January 19, 2017
Publication Date
December 5, 2016
Subject Category
Launch Vehicles And Launch Operations
Acoustics
Fluid Mechanics And Thermodynamics
Report/Patent Number
M17-5678
Meeting Information
Meeting: JANNAF Conference
Location: Phoenix, AZ
Country: United States
Start Date: December 5, 2016
End Date: December 9, 2016
Sponsors: NASA Headquarters, Department of the Army, Department of the Air Force, Department of the Navy
Funding Number(s)
CONTRACT_GRANT: NNM12AA41C
Distribution Limits
Public
Copyright
Public Use Permitted.

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