SSD - Hosters Seminar

Location: AICES Seminar Room 115, 1st floor, Schinkelstr. 2, 52062 Aachen

Dr. Norbert Hosters - Spline-based Methods for Fluid-structure Interaction



The introduction of isogeometric analysis (IGA), made it possible to directly exploit the
favorable geometric properties of NURBS for numerical analysis. The method has become
wide-spread in structural mechanics. However, parametrizing complex three-dimenional
domains — as needed for CFD — using closed volume splines can be challenging. NURBS-
enhanced finite elements (NEFEM)  can be a viable alternative. Both methods together
lead to a geometrically compatible coupling interface for fluid-structure interaction (FSI). Within a partitioned FSI
method, the necessary projection methods simplify due to the matching geometry; 
while at the same time increasing accuracy. But the spline-based description not only offers 
advantages in linking the individual fields. The spline-based boundary description is also 
beneficial for problems of FSI with additional complexities, e.g. free surfaces or contact.
In the talk the theoretical background of the applied spline-based FSI solver will be presented. 

The numerical advantages of the presented combination of isogeometric analysis and the NURBS-enhanced 

finite element method is demonstrated with simple stationary and transient test cases. With more
complex FSI test cases, additional advantages of spline-based methods are presented.

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