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F/A-18 vertical tail buffeting calculation using unsteady fluid structure interaction

Published online by Cambridge University Press:  27 January 2016

M. Guillaume*
Affiliation:
RUAG Aviation/Aerodynamics, Emmen, Switzerland
A. Gehri
Affiliation:
RUAG Aviation/Aerodynamics, Emmen, Switzerland
P. Stephani
Affiliation:
RUAG Aviation/Aerodynamics, Emmen, Switzerland
J. B. Vos
Affiliation:
CFS Engineering, Lausanne, Switzerland
G. Mandanis
Affiliation:
M@M GmbH, Kriens, Switzerland

Abstract

The Swiss Airforce is operating F/A-18C/D Aircraft since 1997. Since the aircraft’s structural design is different from the version operated by the US Navy it was necessary to carry out a structural integrity study (ASIP) which was done by The Boeing Company in St. Louis. To validate this study a full scale fatigue test facility was build at RUAG and operated from 2003 to 2005. When operating this facility difficulties were encountered with the aerodynamic loads data provided by Boeing (insufficient, not well documented, questionable data). As a result RUAG looked for alternative methods to provide the aerodynamic loads, and a large investment was made in the development of a Computational Fluid Dynamics (CFD) tool. The Navier Stokes Multi Block (NSMB) solver, which was developed in an international collaboration, was adopted. In a first phase the code was validated by comparing results of CFD calculations with wind-tunnel results, results from literature and flight test data results. In the second phase, discussed in this paper, a Fluid Structure Interaction (FSI) tool was developed to permit unsteady aero-elastic simulations. Particular attention is focused on the vertical tail since this component of the F/A-18 fighter is very sensitive to fatigue due to unsteady loads generated by buffeting phenomena.

Type
Research Article
Copyright
Copyright © Royal Aeronautical Society 2011 

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References

1. Farhat, C., Lesoinne, M. and Maman, N. Mixed explicit/implicit time integration of coupled aeroelastic problems: three-field formulation, geometric conservation and distributed solution, Int J Numerical Methods in Fluid, 1995, 21, (10), pp 807835.Google Scholar
2. Yates, E.C.AGARD Jr Standard aero-elastic configurations for dynamic response 1: Wing 445.6 AGARD R-765, 1988, NASA TM- 100492, 1987.Google Scholar
3. Vos, J.B., Rizzi, A.W., Corjon, A., Chaput, E. and Soinne, E. Recent advances in aerodynamics inside the NSMB (Navier Stokes Multi Block) Consortium. AIAA 36th Aerospace Sciences Meeting, January 1998.Google Scholar
4. Vos, J.B., Rizzi, A.W., Darracq, D. and Hirschel, E.H. Computational aerodynamics for industrial airframe design using Navier Stokes solvers, Progress in Aerospace Sciences, 2002, 38, pp 601697.Google Scholar
5. Guillaume, M., Gehri, A., Mandanis, G. and Vos, J.B. Calculation of F/A-18 fatigue loads and wing deformations using computational fluid dynamics, Proccedings 2006-10.5.2, ICAS Hamburg, Germany, September 2006.Google Scholar
6. Smith, J. Aeroelastic functionality in edge initial implementation and validation, FOI Report R-1485-SE, 2005.Google Scholar
7. Spekreijse, S.P., Prananta, B.B. and Kok, J.C. A simple, robust and fast algorithm to compute deformations of multi block structured grids, NLR-TP-2002-105, 2002.Google Scholar
8. Goura, G.S.L. Time Marching Analysis of Flutter Using Computational Fluid Dynamics. PhD thesis, 2001, University of Glasgow, Glasgow, UK.Google Scholar
9. Bucher, B., Guillaume, M., Gehri, A., Vos, J.B., Ludwig, T., Merazzi, S. and Mandanis, G. Dynamic response and fatigue loading of the Swiss F/A-18 vertical tail due to buffeting, NAFEMS World Congress, Vancouver, Canada, May 2007.Google Scholar
10. Larry, A.M. Full scale wind-tunnel studies of F/A-18 tail buffet, J Aircr, May-June 1996, 33, (3).Google Scholar
11. Essam, F.S. Alleviation of vertical tail buffeting of F/A-18 Aircraft, J Aircr, March-April 2004, 41, (2).Google Scholar
12. Stephens, R.I., Fatemi, A., Stephens, R.R and Fuchs, H.O. Metal Fatigue in Engineering, 2nd ed; John Wiley & Sons, 2001.Google Scholar