NAFEMS International Journal of CFD Case Studies

Volume 8, January 2009

ISSN 1462-236X

Multibody Simulation of an Oscillating Aeroelastic Wing Model

Jürgen Arnold¹, Gunnar Einarsson² and Wolf Krüger^1
1DLR German Aerospace Center, Institute of Aeroelasticity, D-37073 Göttingen, Germany
²DLR German Aerospace Center, Institute of Aerodynamics and Flow Technology, D-38108 Braunschweig, Germany

https://doi.org/10.59972/ghx4dqen

Keywords: Aeroelasticity, Fluid-Structure-Flight Mechanics Coupling, Elastic Multibody System, Loose Coupling, Distributed Computational Environment

Abstract

The central challenge is to simulate the time-accurate aeroelastic coupling of the flexible wing model of a transport aircraft with a non-linear aerodynamic solver in forced oscillations of large amplitude which are superimposed by rigid body motions. The rigid motions introduce flight mechanical aspects to the aeroelastic simulation.
The simulation platform described in this work is one of two investigated variants in the DLR project SikMa and is characterized by the use of a multibody system (MBS) to account for the elastic structure as well as the flight mechanics and its loose coupling to the computational fluid dynamics (CFD) software. The exchanged data is interpolated with a commercial mesh coupling tool and transferred through an internet socket allowing a distributed computational environment.
Simulations for the wind tunnel setup of the wing model cover the prediction of the aeroelastic state of equilibrium and forced oscillations for heave and pitch excitations. In the case of equilibrium, the simulation results are partially compared to wind tunnel data.

References

[1] Schütte A, Einarsson G, Raichle A, Schöning B, Mönnich W, Neumann J, Arnold J, Alrutz T, Heinecke J, Forkert T. Prediction of the unsteady behavior of maneuvering aircraft by CFD aerodynamic, flight-mechanic and aeroelastic coupling. Proc RTO-MP-AVT-123, Budapest, 2005.

[2] Arnold J, Einarsson G. Multibody simulation of an elastic delta wing in wind tunnel manoeuvres. Proc IFASD 2005, Munich, 2005.

[3] Zingel H. Measurement of steady and unsteady airloads on a stiffness scaled model of a modern transport aircraft wing. Proc IFASD 1991, DGLR 91-069, Aachen, 1991.

[4] Galle M. Ein Verfahren zur numerischen Simulation kompressibler, reibungsbehafteter Strömungen auf hybriden Netzen. DLR-FB 99-04, 1999.

[5] Galle M, Gerhold T, Evans J. Technical documentation of the DLR Tau-Code. DLR-IB 233-97/A43, 1997.

[6] Gerhold T, Galle M, Friedrich O, Evans J. Calculation of complex three-dimensional configurations employing the DLR TauCode. AIAA-97-0167, 1997.

[7] www.simpack.de

[8] Lugner P, Arnold M, Vaculin O (Eds). Vehicle System Dynamics (Special issue in memory of Professor Willi Kortüm), Vol. 41, No. 5, 2004.

[9] Krüger W, Heinrich R, Spieck M. Fluid-structure coupling using CFD and multibody simulation methods. Proc ICAS 2002, Toronto, 2002.

[10] Spieck M, Krüger W, Arnold J. Multibody simulation of the free-flying elastic aircraft. Proc 1st AIAA Multidisciplinary Design Optimization Specialist Conference, Austin, 2005.

[11] www.mpcci.org

[12] Fraunhofer Institute for Algorithms and Scientific Computation SCAI. MpCCI Mesh based parallel code coupling interface. Specification of MpCCI version 2.0, 2003.

[13] www.mcs.anl.gov/mpi/mpich

[14] Gropp W, Lusk E. Installation and user’s guide to MPICH, a portable implementation of MPI version 1.2.3. The ch_p4 device for workstation networks. Argonne National Laboratory, 2002.

[15] Farhat C, Lesoinne M. Higher-Order Staggered and Subiteration Free Algorithms for Coupled Dynamic Aeroelasticity Problems. AIAA 98-0516, 1998.

Cite this paper

Jürgen Arnold, Gunnar Einarsson, Wolf Krüger, Multibody Simulation of an Oscillating Aeroelastic Wing Model, NAFEMS International Journal of CFD Case Studies, Volume 8, 2009, Pages 5-17, https://doi.org/10.59972/ghx4dqen