Abstract
Results of steady and unsteady RANS computations of the flow around the Stratospheric Observatory for Infrared Astronomy SOFIA are presented. The observatory consists of a Boeing 747 SP with an open port in the fuselage to house a 2.5 m infrared telescope for astronomic remote sensing purposes. Results of CFD-simulations, carried out at the University of Stuttgart, show that URANS is able to capture the main effects of the unsteady cavity flow and acoustics inside the SOFIA telescope port. Pressure spectra taken at several points on the telescope’s surface point out the presence of unsteady pressure fluctuations at discrete frequencies. Results compare well with experimental data, generated by NASA in wind tunnel investigations with a 7% model of the SOFIA aircraft.
Keywords
- Wind Tunnel
- Pressure Fluctuation
- Surface Point
- Discrete Frequency
- Tunnel Investigation
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, access via your institution.
Buying options
Preview
Unable to display preview. Download preview PDF.
References
K.K. Ahuja, J. Mendoza. ”Effects of Cavity Dimensions, Boundary Layer, and Temperature on Cavity Noise With Emphasis on Benchmark Data To Validate Computational Aeroacoustic Codes”. NASA Contractor Report 4653, Langley Research Center, Hampton, Virginia, 1995.
C. Atwood, W. Dalsem. ”Flowfield Simulation About the Stratospheric Observatory For Infrared Astronomy”. Journal of Aircraft, Vol. 30, No. 5, 1993, pp. 719–727.
P.J.W. Block. ”Noise Response of Cavities of Varying Dimensions at Subsonic Speeds”. NASA Technical Note NASA TN D-8351, Washington 1976.
N. Forestier, J. Laurent, L. Jacquin, P. Geffroy. ”The mixing layer over a deep cavity at high-subsonic speed”. Journal of Fluid Mechanics, Vol. 475, 2003, pp. 101–145.
T. Gerhold. ”Overview of the Hybrid RANS Code TAU”. In: N. Kroll et al. (Ed.) ”MEGAFLOW — Numerical Flow Simulation for Aircraft Design”. NNFM, Vol. 89, Springer 2005, pp. 81–92.
S. Hein, W. Koch. ”Acoustic Resonances in a 2D High Lift Configuration and 3D Open Cavity”. American Institute of Aeronautics and Astronautics Paper 2005–2867.
M. McIntyre. ”SOFIA V Pressure Sensor Power Spectral Density Plots”. SOFIA Technical Note TN MJM-007, 1999.
M. Mclntyre. ”Analysis of SOFIA Cavity Acoustic Modes”. SOFIA Technical Note TN MJM-011, 2000.
Rose Engineering & Research, INC. ”SOFIA V Design Validation Test Final Report”. Internal Report, 1998.
J. E. Rossiter. ”Wind-Tunnel Experiments on the Flow over Rectangular Cavities at Subsonic and Transonic Speeds”. R & M No 3438, Ministry of Aviation, London 1966, pp. 1–32.
C. W. Rowley. ”Modeling, Simulation and Control of Cavity Flow Oscillations”. Thesis by Clarence W. Rowley, California Institute of Technology Pasadena, California, 2002.
J. Schöberl. ”NETGEN An advancing front 2D/3D-mesh generator based on abstract rules”, Computing and visualization in science, Vol. 1, 1997, pp. 41–52.
G.R Srinivasan, S.P. Klotz. ”Features of Cavity Flow and Acoustics of the Stratospheric Observatory For Infrared Astronomy”, FEDSM97-3647, 1997.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2007 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Schmid, S., Lutz, T., Krämer, E. (2007). Numerical Simulation of the Flow Field Around the Stratospheric Observatory for Infrared Astronomy. In: Tropea, C., Jakirlic, S., Heinemann, HJ., Henke, R., Hönlinger, H. (eds) New Results in Numerical and Experimental Fluid Mechanics VI. Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), vol 96. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74460-3_45
Download citation
DOI: https://doi.org/10.1007/978-3-540-74460-3_45
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-74458-0
Online ISBN: 978-3-540-74460-3
eBook Packages: EngineeringEngineering (R0)