Project Title:

Methods for Computational Aeroacoustics

02.09-9457
910568
Methods for Computational Aeroacoustics
Nielsen Engineering & Research, Inc.
510 Clyde Avenue
Mountain View
CA
94043-2287
Robert E.
Childs
415-968-9457
LaRC
NAS1-19530
024

02.09-9457
910568

Abstract:

Methods for Computational Aeroacoustics
Computational aeroacoustics (CAA) is an emerging discipline in which numerical solutions
of the partial differential equations governing compressible flow are employed to
make predictions of the noise generated by unsteady and turbulent flows. Methods
required for CAA are somewhat similar to those used in computational fluid dynamics
(CFD); however, two major differences are that CAA requires significantly better
far-field boundary conditions and higher accuracy solution algorithms than are typically
employed in CFD. Innovative boundary conditions which employ superposition of numerically
generated solutions for the exterior of the computational domain will be developed
to treat difficult outflow problems. A high-order-of-accuracy shock-capturing algorithm
will be constructed to be consistent with the laws of thermodynamics, unlike many
shock capturing schemes. Improvements in computational efficiency (interpreted as
the range of scales resolved per computational cost) as large as two orders of magnitude
when compared to existing second order methods may be achieved.
This project will improve accuracy and/or reduce cost for computational methods,
both CAA and CFD. These methods are employed by a range of businesses that are as
diverse as aircraft, automobile, and ship manufacturing, food processing, and biomechanics
firms. All of these areas, especially the aerospace industry, could benefit.
computational fluid dynamics, aeroacoustics, boundary conditions, high accuracy algorithms.