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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 89
Edited by: M. Papadrakakis and B.H.V. Topping
Paper 7

Fluid-Structure Coupling for Large Simulations Using Radial Basis Functions

T.C.S. Rendall and C.B. Allen

Department of Aerospace Engineering, University of Bristol, United Kingdom

Full Bibliographic Reference for this paper
T.C.S. Rendall, C.B. Allen, "Fluid-Structure Coupling for Large Simulations Using Radial Basis Functions", in M. Papadrakakis, B.H.V. Topping, (Editors), "Proceedings of the Sixth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 7, 2008. doi:10.4203/ccp.89.7
Keywords: radial basis function coupling, fluid-structure interpolation, information transfer, compact functions, aeroelasticity.

Meshless fluid-structure coupling with radial basis functions is performed for a large case using a partition of unity for each fluid surface point. This partitioning keeps the bandwidth of the coupling matrix (and therefore storage cost and multiplication time) to a minimum but retains a smooth fluid surface mesh suitable for a computational analysis. The method is used to couple an eight million cell finite volume mesh to a simple structural model to find the static aeroelastic deflection of a typical transport aircraft wing, showing that the partitioned method achieves an acceptable result with a maximum matrix bandwidth that is less than 5% of the full method. Since the partitioned method is inherently local, a local force transfer is also guaranteed which is physically more logical than the global influence of the full method.

For the eight million cell mesh studied a reduction in matrix size of 58x was achieved. Since the only expense that scales with the total size of the structural grid varies as N ln(N) the method may also be used on much larger structural grids at little additional cost.

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