In many bio-mechanical problems fluid-structure interaction (FSI) plays an important role. A classic example for an internal flow that is influenced by FSI is the pulsatile flow through a cylindrical straight elastic vessel. To analyze the coherence of the pressure development, the velocity distribution, and the vessel deformation in detail, time-resolved measurements of the velocity field, the static pressure, and the vessel wall movement are performed synchronously. It is the objective of this study to extend the fundamental results by Womersley describing the velocity distribution due to oscillating flow in rigid vessels to highly elastic vessels. Characteristic Reynolds numbers of Re = 138 - 530 and Womersley numbers of W_o = 5 - 10 are investigated. The results show complex changes of the flow and the pressure distribution due to the flexibility of the elastic vessel model. Even at low dilatations a significant impact of the vessel deformation on the flow has been detected.
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