A new efficient algorithm for computational aeroacoustics on massively parallel computers

Yusuf Özyörük, Lyle Norman Long

Research output: Contribution to conferencePaper

Abstract

As transport aircraft engines get larger and larger, the dominant noise source component becomes the fan (forward and aft). A computational massively parallel aeroacoustics algorithm that has been developed to predict forward noise radiation from such engines is described in this paper. The numerical algorithm is a 4th order accurate (both in space and time), Euler/Navier-Stokes solver that is written in essentially High Performance Fortran (HPF). The scheme uses the classical four-stage Runge-Kutta time integration, central differencing for spatial derivatives, and a blend of second and sixth order, Jameson type artificial dissipation to sup press high frequency numerical oscillations. On the outer boundaries of the computational domain, non-reflecting boundary conditions are used. Specifically the algorithm has been optimized for the CM-5 of Thinking Machines Corporation. An overlap ping mixture of the fluxes of the interior points and the far-field boundary points is established by making use of the MERGE statement which the programming languages, CM Fortran and Fortran 90, facilitate. This procedure leads to a simultaneous discretization of the spatial derivatives for the three different sets of governing equations across the domain: Navier-Stokes/Euler equations, radiation boundary conditions and outflow boundary conditions. Hence, approximately 60% reduction in computing the residuals of the governing equations is obtained on the Connection Machine computers. Results for a steady engine inlet flow, oscillating flat plate in a viscous fluid, scattering from a sphere, sound radiation from a baffled oscillating piston, and sound propagation through an axisymmetric inlet are presented.

Original languageEnglish (US)
Pages527-539
Number of pages13
StatePublished - Jan 1 1995
Event12th Computational Fluid Dynamics Conference, 1995 - San Diego, United States
Duration: Jun 19 1995Jun 22 1995

Other

Other12th Computational Fluid Dynamics Conference, 1995
CountryUnited States
CitySan Diego
Period6/19/956/22/95

Fingerprint

Computational aeroacoustics
Boundary conditions
Radiation
Acoustic waves
Engines
Derivatives
Aeroacoustics
Transport aircraft
Inlet flow
Aircraft engines
Euler equations
Pistons
Computer programming languages
Fans
Scattering
Fluxes
Fluids
Industry

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Özyörük, Y., & Long, L. N. (1995). A new efficient algorithm for computational aeroacoustics on massively parallel computers. 527-539. Paper presented at 12th Computational Fluid Dynamics Conference, 1995, San Diego, United States.
Özyörük, Yusuf ; Long, Lyle Norman. / A new efficient algorithm for computational aeroacoustics on massively parallel computers. Paper presented at 12th Computational Fluid Dynamics Conference, 1995, San Diego, United States.13 p.
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Özyörük, Y & Long, LN 1995, 'A new efficient algorithm for computational aeroacoustics on massively parallel computers' Paper presented at 12th Computational Fluid Dynamics Conference, 1995, San Diego, United States, 6/19/95 - 6/22/95, pp. 527-539.

A new efficient algorithm for computational aeroacoustics on massively parallel computers. / Özyörük, Yusuf; Long, Lyle Norman.

1995. 527-539 Paper presented at 12th Computational Fluid Dynamics Conference, 1995, San Diego, United States.

Research output: Contribution to conferencePaper

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Özyörük Y, Long LN. A new efficient algorithm for computational aeroacoustics on massively parallel computers. 1995. Paper presented at 12th Computational Fluid Dynamics Conference, 1995, San Diego, United States.