Paper Info
Title
Development of immersed boundary computational aeroacoustic prediction capabilities for open-rotor noise.
Abstract
A sharp immersed boundary computational aeroacoustic simulation approach for open-rotor direct noise predictions is presented. A specific feature of the finite-difference based immersed boundary method is that the stencil coefficients in the vicinity of the immersed boundary are determined in such a way that the stability of the numerical scheme is improved. The characteristics of this immersed boundary method are discussed for acoustic scattering and the treatment of moving boundaries, such as accounting for freshly cleared and dead cells, efficient geometry queries and efficient computation of irregular boundary stencils and point clouds in the vicinity of the immersed boundary. It is shown that the numerical error when considering moving boundary problems consistently scales with the order of accuracy of the boundary discretization. Finally, the method is applied to simulate the flow around a contra-rotating open rotor at take-off and cruise conditions where experimental data is available for comparison. Excellent agreement for the noise predictions of the contra-rotating open rotor system are obtained between the numerical simulations and the experimental noise measurement.
Year
DOI
Venue
2019
10.1016/j.jcp.2019.02.011
Journal of Computational Physics
Keywords
Field
DocType
Computational aero-acoustics,Higher-order finite differences,Immersed boundary method,Acoustic scattering,Moving boundary,Rotor noise
Immersed boundary method,Order of accuracy,Discretization,Noise measurement,Mathematical analysis,Stencil,Helicopter rotor,Rotor (electric),Mathematics,Computation
Journal
Volume
ISSN
Citations 
388
0021-9991
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
C. Brehm100.34
M. F. Barad200.34
Cetin C. Kiris3142.31