ISMA2012 International Conference on Noise and Vibration Engineering edition:2012 location:Leuven date:17-19 September 2012
This paper reports on the extension of the recently developed Hybrid Boundary Element - Wave Based
Method (Hybrid BE-WBM) to 3D multiple scattering problems. The Wave Based Method (WBM) is a Trefftz
approach which has been developed as an alternative technique to element based methods for steady-state
dynamic problems. When applied on moderately complex geometries, it provides very high convergence rate
and results in lower computational cost. The hybrid method combines the Boundary Element Method (BEM)
and theWave Based Method (WBM) to benefit from the best properties of the two. It benefits from the BEM’s
capability of handling complex geometries while it uses the WBM’s efficiency on geometries of moderate
complexity. Consequently, the hybrid method excels at solving multiple scattering problems where simple
and complex scatterers coexist. The accuracy and performance of the hybrid method is illustrated with a
simple multiple scattering problem and the results are compared with the BEM and the WBM references.
The Hybrid BE-WBM provides accuracy on the level of the coupled methods while it performs three times
faster than the BEM model for the considered case.