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S. Zörner, M. Kaltenbacher, M. Döllinger:
"Investigation of prescribed movement in fluid-structure interaction simulation for the human phonation process";
Computers & Fluids, 86 (2013), 0; 133 - 140.

Abstract In a partitioned approach for computational fluidâEuro"structure interaction (FSI) the coupling between fluid and structure causes substantial computational resources. Therefore, a convenient alternative is to reduce the problem to a pure flow simulation with preset movement and applying appropriate boundary conditions. This work investigates the impact of replacing the fully-coupled interface condition with a one-way coupling. To continue to capture structural movement and its effect onto the flow field, prescribed wall movements from separate simulations and/or measurements are used. As an appropriate test case, we apply the different coupling strategies to the human phonation process, which is a highly complex interaction of airflow through the larynx and structural vibration of the vocal folds (VF). We obtain vocal fold vibrations from a fully-coupled simulation and use them as input data for the simplified simulation, i.e. just solving the fluid flow. All computations are performed with our research code CFS++, which is based on the finite element (FE) method. The presented results show that a pure fluid simulation with prescribed structural movement can substitute the fully-coupled approach. However, caution must be used to ensure accurate boundary conditions on the interface, and we found that only a pressure driven flow correctly responds to the physical effects when using specified motion.

Fluid-structure interaction; Prescribed boundary conditions; Finite element method

http://dx.doi.org/10.1016/j.compfluid.2013.06.031