A Potential-Theoretic Method for Far-Field Sound Radiation Calculations

Hariharan, S. I.; Scott, James R.; Kreider, K. L.

doi:10.1006/jcph.2000.6591

Cited by 16 publications

(8 citation statements)

References 21 publications

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“…The GUST3D solution at this location was obtained using a Kirchhoff approach. 23 The Kirchhoff surface was a circle of radius two chord lengths, centered about the airfoil center. Again, the comparisons are very good for the low-frequency cases, and the high-frequency results are acceptable.…”

Section: Resultsmentioning

confidence: 99%

Validation of a high-order prefactored compact code on nonlinear flows with complex geometries

Hixon

Mankbadi

Scott

2001

39th Aerospace Sciences Meeting and Exhibit

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A finite-difference time domain solution of the airfoil gust problem is obtained using a high-accuracy nonlinear computational aeroacoustics code. For computational efficiency, the equations are cast in chain-rule curvilinear form, and a structured multiblock solver is used in parallel. In order to fully investigate the performance of this solver, a test matrix of eight problems are computed (two airfoil geometries, two gust frequencies, and two gust configurations). These results are compared to solutions obtained by the GUST3D frequency-domain solver both on the airfoil surface and in the far field. Grid density and domain size studies are included.

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Section: Resultsmentioning

confidence: 99%

Validation of a high-order prefactored compact code on nonlinear flows with complex geometries

Hixon

Mankbadi

Scott

2001

39th Aerospace Sciences Meeting and Exhibit

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“…Following similar transformations used in several previous works in dealing with the convective wave equation (see, e.g., [5,16,17,28]), we introduce new variablesx,ȳ, and t as follows:…”

Section: Stable Pml Equationsmentioning

confidence: 98%

A Stable, Perfectly Matched Layer for Linearized Euler Equations in Unsplit Physical Variables

Hu¹

2001

Journal of Computational Physics

263

170

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“…Finally, we employ a Kirchoff method [11] to obtain the intensity results on the circle of radius four chord lengths. The Kirchoff surface is the circle of radius two chord lengths.…”

Section: Linearized Benchmark Solutionmentioning

confidence: 99%

Benchmark Solutions for Computational Aeroacoustics (CAA) Code Validation

Scott

2004

Noise Control and Acoustics

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NASA has conducted a series of Computational Aeroacoustics (CAA) Workshops on Benchmark Problems to develop a set of realistic CAA problems that can be used for code validation. In the Third (1999) and Fourth (2003) Workshops, the single airfoil gust response problem, with real geometry effects, was included as one of the benchmark problems. Respondents were asked to calculate the airfoil RMS pressure and far-field acoustic intensity for different airfoil geometries and a wide range of gust frequencies. This paper presents the validated solutions that have been obtained to the benchmark problem, and in addition, compares them with classical flat plate results. It is seen that airfoil geometry has a strong effect on the airfoil unsteady pressure, and a significant effect on the far-field acoustic intensity. Those parts of the benchmark problem that have not yet been adequately solved are identified and presented as a challenge to the CAA research community.

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A Potential-Theoretic Method for Far-Field Sound Radiation Calculations

Cited by 16 publications

References 21 publications

Validation of a high-order prefactored compact code on nonlinear flows with complex geometries

Validation of a high-order prefactored compact code on nonlinear flows with complex geometries

A Stable, Perfectly Matched Layer for Linearized Euler Equations in Unsplit Physical Variables

Benchmark Solutions for Computational Aeroacoustics (CAA) Code Validation

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